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Bradford White Water Heater Error Codes List: Every Code Explained
Every Bradford White water heater error code we could verify against Bradford White's own documentation — what it means, what usually causes it, and the first fix to try — in one table. Codes differ between model series, so treat your model's tech sheet as the final word.
Safety first. Before you start: unplug the appliance (or switch off its breaker) before opening any panel, and close the water taps before disconnecting hoses. A water heater combines gas, combustion air, venting and a pressure vessel, and Bradford White's manuals reserve most of the system for licensed technicians. Never open the gas valve or gas train, never bypass or jumper a pressure switch, limit switch, flammable vapor sensor or thermal fuse, and never defeat a temperature-and-pressure (T&P) relief valve. If you smell gas, shut off the supply, ventilate and call the gas utility or a licensed technician — codes like the Infiniti GS/GR 40 (gas leakage detected) and K Series FA (gas path leakage) are alarms, not reset prompts. Owner-level work is external only: checking intake and exhaust terminations for blockage, clearing a condensate line or trap, cleaning the ScreenLok vapor screen and the tankless air filter, verifying gas and water shutoffs are open, and performing ONE documented reset. Anything involving the burner, gas valve, venting internals, sensors inside the cabinet or repeated lockouts belongs to a licensed technician.
How to read and retrieve error codes on Bradford White water heaters
Read the code in its own system. On an ICON gas control, watch the LED through at least two full cycles: count the flashes before the three-second pause, note the colour (green is normal operation on the Honeywell V2 chart, yellow is a weak-pilot warning, red is a fault), and on power-vent, damper and TTW controls watch for a second group — 6 flashes then 1 flash is a different fault from 6 alone. On an eF display, write the number down exactly: the Honeywell control stores up to 10 previous error codes (Temperature Down scrolls the history, Select views each code), and the ICON HD control files some codes in its Diagnostic History under a different number than the one displayed (ignition failure shows 110, stores 109). On an Infiniti GS/GR the remote flashes 'Er' plus the number and the controller records ten previous faults (Installer Mode 1:EH); on an Infiniti K, the Failure History menu holds ten codes as 1F through 10F, and the P4 information menu shows live sensor readouts (0d to 10d) that are data, not error codes.
The complete Bradford White water heater error code list
| Code | Meaning | Most likely cause | First fix |
|---|---|---|---|
| 1 flash | Normal operation, not a fault (tank gas, ICON gas control): one flash every four seconds (green on Honeywell V2) means the pilot is lit and the main burner is off / the thermostat is satisfied; on ICON 1.0/2.0 the single flash marks knob-in-pilot-position or thermostat satisfied | Normal standby state between heating cycles | No repair needed. Turn the knob to the desired setpoint if it is still at PILOT |
| 2 flashes | Scope-split flash (tank gas, ICON): on atmospheric ICON (Defender / Ultra Low NOx) two flashes with a three-second pause (yellow on Honeywell V2) mean a weak pilot signal — low thermopile voltage, main valve not turned on. On power-vent ICON the same count means the pressure switch is stuck closed (safety circuit closed when it should be open at start-up) | Atmospheric: weak/unstable pilot flame, dirty pilot assembly or loose thermopile connections. Power vent: pressure switch contacts stuck closed, or condensate/dirt/kinks in its tubing | Check the pilot flame and thermopile connections (atmospheric) or the pressure switch and tubing (power vent); switch and thermopile testing are licensed technician work — never bypass a pressure switch |
| 3 flashes | Scope-split flash (tank gas, ICON): on ICON 1.0 atmospheric models (incl. Eco-Defender) three flashes with a three-second pause mean insufficient water heating — the control has not seen a temperature rise in the proper amount of time (thermowell and chamber temperature sensors out of calibration, or a possible short); the system resets when heating recovers. On power-vent ICON three flashes mean the pressure switch or temperature switch is stuck open. The Defender Honeywell V2 chart has NO 3-flash fault — do not read one onto it | Atmospheric: sensor calibration drift/short, low gas pressure, or water flowing through the tank during the call. Power vent: blocked vent, blower not up to speed, or damaged switch tubing | Atmospheric: check gas pressure and that no water is flowing; sensor diagnosis is technician work. Power vent: clear the vent termination and check the blower and tubing — never jumper the switch |
| 4 | Low flame sense signal / low flame sense current (eF Series display, Honeywell generation). This is the only code that does NOT cause a lockout — the display shows 'Service Needed' but operation continues | A dirty or corroded flame rod, poor burner ground, or weak flame current from a scaled burner | Clean or replace the flame rod and verify the burner ground; flame-current measurement is licensed technician work |
| 4 flashes | High tank temperature — temperature cut-out (TCO) limit reached, causing shutdown (tank gas, ICON, all generations; red on Honeywell V2). The system must be reset | Excessive tank temperature: thermowell sensor out of calibration, a faulty gas valve/control, or heat migration in the plumbing system | Shut off the control and reduce the water temperature setpoint; the TTW procedure is to rotate the knob to minimum for at least 6 seconds before returning it. A repeat trip is licensed technician work — never bypass the limit |
| 5 flashes | Scope-split flash (tank gas, ICON): on Defender Honeywell V2, five flashes (red) mean an electronics, sensor or gas valve fault detected (control may be wet or damaged). On Ultra Low NOx ICON 1.0/2.0, five flashes mean a gas valve thermostat sensor fault. On power-vent/damper ICON, five flashes mean a false pilot flame sensed — pilot valve stuck open | V2: wet/damaged control or a sensor fault (open/short or mismatched sensor elements). ULN: thermostat sensor fault in the gas valve. Power vent/damper: flame sensor short to ground or a gas valve stuck open | Verify all connections are tight and the control is dry; reset the gas valve where Bradford White directs (ULN). A persistent 5, and any stuck-open gas valve, is licensed technician replacement work |
| 6 | Flame sensed out of normal sequence — flame detected before the gas valve opened or after it closed (eF Series display, Honeywell generation) | A gas valve that is not fully closing, a shorted flame rod circuit, or residual flame at the burner | Verify the flame rod circuit and that the gas valve closes fully; gas valve work is licensed technician work |
| 6 flashes | Chamber door temperature sensor out of specification (tank gas, Ultra Low NOx ICON 1.0/2.0 atmospheric). On power-vent/damper/TTW ICON models there is no plain 6 — those controls use the compound 6-1 to 6-4 patterns below | Chamber door sensor resistance out of range, a dirty ScreenLok vapor screen or a dirty burner skewing chamber temperatures | Clean the ScreenLok vapor screen and the burner and check the door sensor ohms — sensor replacement is licensed technician work |
| 6 flashes + 1 flash | Pilot failed to light (tank gas, power-vent, damper and TTW ICON — the 6-1 compound pattern) | Dirty or blocked pilot assembly, no gas flow, or a poor connection at the gas valve | Inspect and clean the pilot assembly, verify gas flow and the connection at the gas valve; pilot and gas valve work is licensed technician work |
| 6 flashes + 2 flashes | Safety circuit opened during operation (tank gas, power-vent/damper ICON — the 6-2 compound pattern): on power-vent models the pressure switch or temperature switch opened during the run cycle; on damper models the damper moved from the full-open position during the run cycle (that variant auto-resets after 5 minutes) | Vent blockage, a weakening blower, a damper/vent obstruction, or a failing switch | Check the vent (and damper travel, on damper models) for blockage and measure vacuum at the pressure switch — switch testing is technician work; never bypass the switch to keep the heater running |
| 6 flashes + 3 flashes | Pilot flame extinguished (tank gas, power-vent and damper ICON — the 6-3 compound pattern) | A dirty pilot assembly, a poor connection at the gas valve, low gas pressure or a draft disturbing the pilot | Inspect and clean the pilot, check the connection at the gas valve and gas flow; persistent flame loss is licensed technician work |
| 6 flashes + 4 flashes | False pilot flame sensed / pilot valve stuck open (tank gas, power-vent and damper ICON — the 6-4 compound pattern) | Flame sensor short to ground, or a gas valve physically stuck open | Check for a flame sensor short to ground; a gas valve that is stuck open must be replaced by a licensed technician — do not keep resetting this pattern |
| 7 flashes | Scope-split flash (tank gas, ICON): on Ultra Low NOx ICON 1.0, seven flashes mean a gas valve fault. On power-vent, damper and TTW ICON, seven flashes mean a flammable vapor sensor / simulated resistive device fault; the TTW service manual details the lockout path (7-then-1 flashes after repeated out-of-range readings) into flammable vapor lockout | ULN: internal gas valve fault. Power vent/damper/TTW: vapor sensor resistance outside the documented 3.0–48 kOhm window, a damaged harness, or actual flammable vapors present | First verify no flammable vapors are present near the heater. ULN: reset the gas valve; if the fault persists the valve is replaced by a technician. Vapor-sensor models: sensor and harness testing are technician work — never defeat the vapor sensor |
| 8 flashes | Pilot remains lit while the control knob is in the OFF position (tank gas, Ultra Low NOx ICON 1.0 atmospheric). On power-vent/damper/TTW ICON there is no plain 8 — those controls use the compound 8-1 to 8-4 patterns below | A gas valve that has not shut off with the knob off, or abnormal gas pressure | Check gas pressure; Bradford White's chart directs gas valve replacement — licensed technician work. Do not use a heater whose pilot will not shut off |
| 8 flashes + 1 flash | Flammable vapor sensor out of specification, possible short (tank gas, power-vent and damper ICON — the 8-1 compound pattern) | Vapor sensor resistance outside 3.0–48 kOhms, a shorted sensor, damaged harness, or flammable vapors present | Verify no flammable vapors are present; sensor resistance and harness checks are licensed technician work |
| 8 flashes + 2 flashes | Thermowell sensor damaged or unplugged (tank gas, power-vent and damper ICON — the 8-2 compound pattern) | A failed temperature probe in the thermowell or its connection lost | Check the temperature probe ohms against Bradford White's sensor temperature chart; the probe is part of the gas valve assembly — technician work |
| 8 flashes + 3 flashes | Gas valve electronics fault (tank gas, power-vent and damper ICON — the 8-3 compound pattern in both ICON Quick Service Guides). Generation note: the older TTW50 service manual assigns its 8-then-3 pattern to temperature sensor faults (open circuit, or the two sensor elements disagreeing by more than ±5.5°F) — read a TTW50 by its own manual | An internal electronics failure in the gas control | Reset the gas valve; if the problem persists Bradford White directs gas valve replacement — licensed technician work |
| 8 flashes + 4 flashes | Gas valve fault detected (tank gas, power-vent and damper ICON — the 8-4 compound pattern) | An internal fault detected in the gas valve/control | Reset the gas valve; if the problem persists Bradford White directs gas valve replacement — licensed technician work |
| 9 flashes | Tank leakage detected by an accessory module (tank gas, Ultra Low NOx ICON 2.0 atmospheric) | The leak-detection accessory has sensed water | Find and stop the leak first; Bradford White refers troubleshooting to the accessory module's own instructions. Shut off the water supply to the heater if it is actively leaking |
| 10 flashes | Insufficient combustion air detected (tank gas, Ultra Low NOx ICON 1.0 and 2.0 atmospheric) | A clogged ScreenLok vapor screen, a dirty burner, restricted venting, or a chamber door (RTD) sensor reporting starved combustion air | Clean the ScreenLok vapor screen in the chamber and the burner, and check venting; sensor testing is licensed technician work |
| 23 | Flame detected before ignition (eF Series display, Honeywell generation) — the control sees flame during a period when no flame should exist, before the ignition trial | A leaking gas valve, a flame rod shorted to ground, or flame present from a previous cycle | Test the flame rod for a short to ground and verify the gas valve seals; gas valve work is licensed technician work |
| 24 | Flame detected after a heating cycle completes (eF Series display, Honeywell generation) — the flame sense circuit still reports flame once the cycle should be over | A gas valve slow to close or leaking through, or a flame rod circuit fault | Verify the valve closes and the rod circuit is sound; a valve that passes gas after shutdown is licensed technician replacement work |
| 26 | Exhaust collector limit switch open (eF Series display, Honeywell generation) — the high-temperature limit in the exhaust collector has opened | Restricted venting, a blocked condensate drain backing heat into the collector, or an overheated exhaust path | Clear the vent termination and condensate drain; the limit switch and its circuit are tested by a licensed technician — never bypass a limit switch |
| 29 | Pressure switch failed to close or open — stuck open (eF Series display, Honeywell generation; the same Honeywell family documents 29 on power-vent/damper display models) | Blocked vent or condensate, a failed blower, cracked switch tubing, or a failed pressure switch | Clear vent and condensate blockages and check the blower and tubing — Bradford White's I&O sequence notes operation resumes when the blockage is removed; switch replacement is technician work |
| 32 | Lower sensor readings faulty / temperature sensor fault (eF Series display, Honeywell generation) — the lower tank temperature sensor is reading out of range | A failed lower sensor, a damaged harness, or a poor connector at the control | Check the sensor resistance against the temperature chart and the harness; sensor replacement is licensed technician work |
| 57 | Flame rod shorted to ground — Bradford White's Honeywell-generation documents also word it as the spark rod shorted to ground (eF Series display) | A damaged flame/spark rod touching the burner or chassis, or chafed rod wiring grounding out | Inspect the rod and its lead for contact with metal; rod replacement is licensed technician work — a shorted ignition/flame rod is not an owner repair |
| 58 | AC line frequency error — the power signal is too noisy or the frequency is incorrect (eF Series display, Honeywell generation; the Quick Service Guide words it as a power supply problem / line voltage fault) | A noisy or unstable building supply, generator power off frequency, or a wiring fault at the heater's outlet | Have an electrician verify the supply voltage and frequency; if the utility supply is clean, the control is tested by a technician |
| 59 | Line voltage too low or too high (eF Series display, Honeywell generation) | Utility voltage out of range, a failing circuit, or a shared circuit dropping under load | Measure the supply at the heater; correct building wiring problems with an electrician before suspecting the control |
| 61 | DC output voltage unstable (eF Series display, Honeywell generation) — the integrated control's internal DC supply is out of tolerance | A failing integrated control power stage | Verify clean AC input first; a persistent 61 points to control replacement by a licensed technician |
| 62 | Maximum number of retries detected — SOFT lockout (eF Series display, Honeywell generation). The burner could not light and stay lit through the control's retry sequence. Not to be confused with ICON HD hold 62 (fan speed not proved), keyed HD-62 below | Repeated ignition failure: no gas, a dirty pilot/flame rod, a weak igniter, or a failing gas valve | Bradford White documents the user-level reset: in User Mode, press the lower right Lockout Reset button (the control also makes 3 relight attempts every hour in soft lockout). If it relocks, stop resetting — the ignition fault is licensed technician work |
| 63 | Maximum number of ignition recycles detected — SOFT lockout (eF Series display, Honeywell generation). The burner lit but kept losing flame until the recycle limit was reached | Unstable flame: dirty flame rod, poor ground, low gas pressure, or a partially blocked burner | Reset once from User Mode (lower right Lockout Reset); a repeat 63 needs a technician to measure flame current and gas pressure — do not cycle resets |
| 64 | Electronics failure (eF Series display, Honeywell generation) — the integrated control has detected an internal electronics fault; hard lockout | A failed integrated control board or its internal monitoring circuits | Bradford White reserves the hard-lockout reset for Service Mode (Temperature Up + Select together for 3 seconds, then Lockout Reset held 3 seconds) and for service personnel only — this is a licensed technician call, normally control replacement |
| 65 | High water temperature — tank water over 200°F (eF Series display, Honeywell generation). HARD lockout; the control will not relight until a technician resets it in Service Mode | A failed temperature sensor, a stuck gas valve, or a control fault letting the burner overrun the setpoint | Do not reset and reuse: Bradford White's I&O requires the hard lockout to be cleared in Service Mode by a qualified technician after the overheat cause is corrected |
| A0 | Cold or hot water temperature sensor fault (Infiniti K Series tankless) — Bradford White's K I&O words it as the water temperature sensors disconnected or damaged | A failed or disconnected water temperature sensor | Reset: press and hold the ON/OFF button for more than 3 seconds (Bradford White K reset). A code that returns needs a technician to test the sensors |
| A1 | Temperature inside the cabinet is above 158°F (Infiniti K Series tankless) — the appliance regulates (reduces) its performance to avoid overheating rather than locking out | Restricted cabinet airflow, a blocked air filter, or a hot installation space | Clean the air filter and clear obstructions around the unit; if cabinet temperature stays high, a technician checks the fan and clearances |
| A2 | External tank temperature sensor fault / sensor not installed properly (Infiniti K Series tankless, storage-tank installations) | The external tank sensor is disconnected, damaged or incorrectly fitted | Refit or replace the sensor — licensed technician work; reset with ON/OFF held more than 3 seconds |
| A3 | Flue gas temperature sensor fault (Infiniti K Series tankless) | A failed flue gas thermistor or harness damage | Sensor testing is licensed technician work; reset with ON/OFF held more than 3 seconds |
| A4 | Cabinet air temperature sensor fault (Infiniti K Series tankless) | A failed cabinet air thermistor or harness damage | Sensor testing is licensed technician work |
| A5 | Primary or secondary heat exchanger gas temperature sensor fault (Infiniti K Series tankless) — the K I&O words it as the condensing unit flue temperature sensor disconnected or damaged | A failed heat-exchanger flue thermistor or a disconnected lead | Sensor testing is licensed technician work |
| A6 | Inlet water temperature sensor fault (Infiniti K Series tankless) | A failed inlet thermistor or harness damage | Sensor testing is licensed technician work |
| A7 | Heat exchanger temperature sensor fault (Infiniti K Series tankless) | A failed heat exchanger thermistor or harness damage | Sensor testing is licensed technician work |
| A8 | Outlet water temperature sensor fault (Infiniti K Series tankless) | A failed outlet thermistor or harness damage | Sensor testing is licensed technician work |
| A9 | Incorrect output power (Infiniti K Series tankless): incoming gas pressure too low — below 3.5 in. WC on natural gas or 8 in. WC on LP — or the hot water temperature sensor is not installed properly | Undersized/restricted gas supply, a regulator problem, or a mis-fitted outlet sensor | A licensed technician measures inlet gas pressure with a manometer under load and checks the sensor fit — gas supply work is never an owner repair |
| AA | Flue gas temperatures too high (Infiniti K Series tankless): above 356°F after the primary heat exchanger and/or 176°F at the exhaust sensor per the K service manual (the K I&O states the condensing unit flue temperature above 392°F and/or above 145°F at the exhaust sensor); the appliance regulates power to protect itself | A scaled heat exchanger transferring heat poorly, or restricted venting | Descale the heat exchanger (the K I&O remedy) and verify the vent; persistent AA is licensed technician work |
| Bright/dim LED | Normal operation, not a fault (tank gas, power-vent and damper ICON): a bright/dim alternating LED means the thermostat is calling for heat | A normal call for heat is in progress | No repair needed |
| C1 | Flue blockage detected during startup due to insufficient combustion air (Infiniti K Series tankless; C1 and C2 are defined together in the K I&O with the same remedy) | Blocked air/exhaust openings or a dirty/clogged air filter starving combustion air at startup | Bradford White's documented remedy: reset (ON/OFF held more than 3 seconds), check the air/exhaust openings for obstructions and clean the air filter. Gas/air tuning, if needed, is a qualified technician's job |
| C2 | Flue blockage detected during startup due to insufficient combustion air (Infiniti K Series tankless; defined jointly with C1 in the K I&O) | Blocked air/exhaust openings or a dirty/clogged air filter | Same documented remedy as C1: reset with ON/OFF held more than 3 seconds, clear the air/exhaust openings, clean the air filter |
| C3 | Flow sensor does not detect water (Infiniti K Series tankless) — the K I&O specifies water recirculation not detected | No flow through the unit: closed valves, a failed flow sensor, or a recirculation loop not moving water | Verify water valves are open and flow exists; flow sensor testing is licensed technician work |
| C5 | Fault in the bypass valve (Infiniti K Series tankless) — the K I&O words it as the bypass water valve disconnected or damaged | A disconnected bypass valve actuator or a failed valve | Valve and actuator work is licensed technician work; reset with ON/OFF held more than 3 seconds after repair |
| C7 | Fan not working — fan disconnected or damaged (Infiniti K Series tankless) | A failed combustion fan or a lost fan connection | Fan replacement is licensed technician work |
| C8 | Main water valve disconnected (Infiniti K Series tankless) | The motorized main water valve's connector is off or the valve has failed | Reconnect or replace the valve — licensed technician work |
| C9 | Barometric pressure sensor fault (Infiniti K Series tankless) — Bradford White's K service manual directs: replace the ECU | A failed pressure sensor inside the electronic control unit | ECU replacement is licensed technician work |
| CA | Water flow above the maximum (about 9.2 GPM) and/or air in the water circuit at commissioning (Infiniti K Series tankless — the two K documents split the wording between the flow limit and purging air) | Excess demand flow through the unit, or air trapped in a newly filled water circuit | Purge the hydraulic circuit of air per the K I&O; water pressure must not exceed 150 psi. Persistent CA on normal flow is technician work |
| CE | Flue blockage detected during operation due to excessive pressure on the siphon (Infiniti K Series tankless) | A full or blocked condensate siphon/trap raising flue-side pressure during firing | Drain and clear the condensate siphon and line — owner-level external check; a recurring CE needs a technician to verify trap and vent slope |
| CF | Flue blockage detected during operation due to insufficient combustion air (Infiniti K Series tankless) | Intake or exhaust restriction developing during operation, or a clogging air filter | Clear the air/exhaust openings and clean the air filter; combustion tuning is licensed technician work |
| E0 | Internal failure in the ECU (Infiniti K Series tankless) | An electronic control unit hardware/software fault | Try the documented reset (ON/OFF held more than 3 seconds) once; a returning E0 means ECU replacement by a licensed technician |
| E1 | Hot water temperature above 194°F (Infiniti K Series tankless) — the burner is cut off and reactivates after the water cools | A scaled heat exchanger, low flow through the unit, or a sensor fault letting outlet temperature overshoot | Descale the heat exchanger and verify flow; do not defeat the overheat cut-off — a repeat E1 is licensed technician work |
| E3 | Flue gas temperature sensor detects high temperature (Infiniti K Series tankless): above 194°F per the K service manual; the K I&O states above 167°F, or 2 minutes above 145°F | Heat exchanger scaling or restricted venting driving flue temperature up | Descale and check the vent; flue-side diagnosis is licensed technician work |
| E4 | Cabinet temperature too high (Infiniti K Series tankless): above 194°F per the K service manual; the K I&O states above 176°F, or 2 minutes above 158°F | Blocked cabinet ventilation or air filter, or a failing fan | Clean the air filter and clear the unit's surroundings; persistent E4 is licensed technician work |
| E5 | Copper heat exchanger gas temperature sensor detects temperature above 392°F — the appliance is locked (Infiniti K Series tankless). The K I&O states the lockout condition as the condensing unit flue gas temperature above 428°F, or 2 minutes above 392°F, with the burner cut off. Note: Bradford White writes this code 'E5', not 'E05' — see UNVERIFIED | Severe heat exchanger scaling or flue restriction overheating the copper heat exchanger | Bradford White's K I&O remedy: descale the appliance. Then reset with ON/OFF held more than 3 seconds; a repeat E5 means the overheating cause is still present — licensed technician work |
| E7 | Internal error (Infiniti K Series tankless) | An internal ECU fault | Reset once (ON/OFF held more than 3 seconds); a returning E7 is ECU diagnosis by a licensed technician |
| E8 | Error during ionization test — ECU internal error; the ECU may need replacement (Infiniti K Series tankless) | The control's flame-ionization self-test failed | ECU diagnosis and replacement are licensed technician work |
| E9 | Thermofuse open — temperature above 237°F (Infiniti K Series tankless; the K I&O words it as the thermal fuse broken) | Extreme overheating has operated the thermal fuse | Licensed technician work only — the fuse does not reset and the overheating cause must be found first |
| EA | Flame not detected — ionization loss 9 consecutive times (Infiniti K Series tankless, K service manual); the K I&O words EA as ignition failure | No ignition or flame not proven: gas supply off/low, dirty flame rod, or a failed igniter | Verify gas is on to the unit and reset (ON/OFF held more than 3 seconds) once; repeated EA needs a technician to check gas pressure and the ionization circuit |
| EC | Partial ionization loss 5 times (Infiniti K Series tankless, K service manual); the K I&O words EC as flame lost during operation | Unstable flame signal: a dirty flame rod, fluctuating gas pressure, or wind/vent effects on the flame | Reset once (ON/OFF held more than 3 seconds); recurring EC is a technician diagnosis of the flame rod and gas pressure |
| EE | Modulating gas solenoid valve disconnected (Infiniti K Series tankless) | The modulating solenoid's connector is off or the coil has failed | Gas valve components are licensed technician work |
| EF | Wrong gas type (Infiniti K Series tankless) — the unit is configured/fueled for a different gas than it detects | A conversion not performed or incorrect after a fuel change, or wrong gas-type setting | Gas conversion and settings are licensed technician work only — never run a unit on the wrong gas type |
| F2 | ECU internal error (Infiniti K Series tankless) | An electronic control unit fault | Reset once (ON/OFF held more than 3 seconds); a returning F2 is ECU replacement by a licensed technician |
| F3 | ECU internal error family (Infiniti K Series tankless) — the K I&O groups F2, F3, F7 and F8 as ECU internal errors; the K service manual specifies F3 as a memory failure | A control memory/electronics fault | Reset once (ON/OFF held more than 3 seconds); persistent F3 means ECU replacement by a licensed technician |
| FA | Gas shut-off valve fault / gas leakage in the gas path (Infiniti K Series tankless): the K service manual specifies a fault in the main gas shut-off valve or the gas manifold shut-off valve; the K I&O words it as gas leakage in the gas path (gas valve or gas manifold shut-off valves) | A failed shut-off valve or a leak in the internal gas path | Treat as a gas safety fault: shut off the gas and call a licensed technician — do not reset and retry |
| GR-10 | Flame has been lost 8 times — hard lock (Infiniti GS/GR tankless). The burner lit but the flame failed repeatedly until the control locked out | Unstable gas supply, a dirty flame rod, venting that disturbs the flame, or a failing gas valve | After the cause is remedied, hard locks clear with the Power button (Bradford White GS/GR manual). Repeated flame loss is licensed technician work — check gas pressure and the flame rod, do not just power-cycle |
| GR-11 | Ignition has failed 10 times — hard lock (Infiniti GS/GR tankless). The unit could not establish flame across ten ignition attempts | No gas or low inlet gas pressure, a failed igniter, a dirty flame rod, or blocked combustion air | Verify gas is on to the unit and the intake/exhaust are clear; clear the lock with the Power button once. If it relocks, a licensed technician checks inlet gas pressure (a manometer reading) and the ignition parts |
| GR-16 | Operating temperature sensor or DHW sensor detects water temperature greater than 199°F (93°C) — hard lock (Infiniti GS/GR tankless) | Scale-restricted heat exchanger flow, a failed temperature sensor, or overheating from low water flow | Descale the heat exchanger and verify the sensors; overheating protection faults are licensed technician work — do not bypass the temperature sensors |
| GR-20 | High limit overheat switch fault — closed is normal, open is the fault (Infiniti GS/GR tankless). Hard lock | The overheat switch has opened from genuine overheating or has failed open | Find the overheating cause (scale, low flow) before resetting; switch testing is licensed technician work — never jumper a high limit switch |
| GR-29 | Condensate trap blocked — hard lock (Infiniti GS/GR tankless) | A blocked condensate trap or drain line, or a blockage at the exhaust vent termination backing condensate up | Owner-level: clear the condensate line and its termination and check the exhaust vent for blockages, exactly as Bradford White's table directs; a trap that keeps blocking needs a technician to check trap priming and vent slope |
| GR-31 | Inlet water sensor open or short — soft lock (Infiniti GS/GR tankless) | A failed inlet thermistor or a damaged harness/connector | Soft locks clear when the condition is remedied; sensor resistance testing and replacement are licensed technician work |
| GR-32 | DHW (hot water outlet) sensor open or short — soft lock (Infiniti GS/GR tankless) | A failed outlet thermistor or harness damage | Clears when remedied; thermistor testing is licensed technician work |
| GR-33 | Operating temperature sensor open or short — soft lock (Infiniti GS/GR tankless) | A failed operating thermistor or harness damage | Clears when remedied; thermistor testing is licensed technician work |
| GR-35 | Exhaust sensor open or short — soft lock (Infiniti GS/GR tankless) | A failed exhaust thermistor or harness damage | Clears when remedied; thermistor testing is licensed technician work |
| GR-39 | Flame detected after exiting a flame-on condition — the control still senses flame when it should be gone (Infiniti GS/GR tankless). Soft lock | A gas valve not fully closing, or a flame rod circuit fault reporting phantom flame | Clears when remedied, but a valve that passes gas after shutdown is a licensed technician replacement — do not ignore this one |
| GR-40 | Gas leakage detected — in 10 minutes, or three times within one hour, each lasting more than 5 seconds (Infiniti GS/GR tankless). Hard lock | A leaking gas connection or a gas valve/manifold leak inside the unit | Shut off the gas, ventilate, and call a licensed technician or the gas utility — this is a leak alarm, not a reset-and-retry code |
| GR-41 | Fan speed too high with flame on — hard lock (Infiniti GS/GR tankless) | A fan control fault, incorrect vent configuration, or a failing fan | Fan diagnosis is licensed technician work; clear the lock with the Power button only after the repair |
| GR-42 | APS (air pressure switch) fault — closed is normal, open is the fault (Infiniti GS/GR tankless). Hard lock | Blocked intake or exhaust, a failed pressure switch, or damaged sensing tubing | Clear the intake and exhaust terminations first; switch and tubing testing are licensed technician work — never bypass an air pressure switch |
| GR-43 | Burner overheat switch open — hard lock (Infiniti GS/GR tankless) | Genuine burner overheating (restricted venting or airflow) or a failed switch | Correct the overheating cause before clearing the lock with the Power button; switch testing is technician work |
| GR-44 | Possible pump failure — hard lock (Infiniti GS/GR tankless) | The recirculation pump is not moving water as commanded | Pump diagnosis and replacement are licensed technician work; clear the lock with the Power button after repair |
| GR-45 | Water leak detection — hard lock (Infiniti GS/GR tankless). On a leak signal the flow control valve closes automatically to prevent leak damage | Water detected where it should not be: a plumbing leak, condensate overflow, or a failed leak sensor | Bradford White's table directs: turn the power OFF immediately, turn off (valve off) the water heater, and call a qualified technician. Find and stop the leak before anything is reset |
| GR-46 | Low recirculation flow — hard lock (Infiniti GS/GR tankless) | A blocked recirculation loop, closed valves in the loop, or a weak pump | Check that recirculation loop valves are open and filters are clean; pump work is licensed technician work |
| GR-60 | Hot water temperature abnormality — soft lock (Infiniti GS/GR tankless) | Delivered temperature unstable or out of range: a failing mixing/flow valve, sensor drift, or scale | Clears when the condition is remedied; if outlet temperature swings continue, a technician checks the valves and sensors |
| GR-61 | Fan speed feedback signal abnormal — soft lock (Infiniti GS/GR tankless) | The fan's speed feedback signal is missing or implausible: fan or harness fault | Clears when remedied; fan and harness diagnosis are licensed technician work |
| GR-65 | Flow control valve error — hard lock (Infiniti GS/GR tankless) | The motorized flow control valve is not moving or not reporting position correctly | Valve replacement is licensed technician work; clear the lock with the Power button after repair |
| GR-66 | Mixing valve error — hard lock (Infiniti GS/GR tankless) | The mixing valve is not responding or is out of position | Valve replacement is licensed technician work; clear the lock with the Power button after repair |
| GR-67 | AGM (air/gas module) error — hard lock (Infiniti GS/GR tankless) | A fault in the air/gas modulation module that meters combustion | AGM diagnosis is licensed technician work — combustion components are never owner repairs |
| GR-72 | Flame signal detected before ignition — soft lock (Infiniti GS/GR tankless). The flame circuit reports flame before the gas valve opens | A flame rod short or contamination, or a control sensing fault | Clears when remedied; rod cleaning and circuit checks are licensed technician work |
| GR-73 | DIP switch abnormal — soft lock (Infiniti GS/GR tankless) | An invalid DIP switch combination for the installation (gas type, venting or installation settings changed or mis-set) | DIP settings are installer configuration — a licensed technician verifies them against the installation manual for the actual gas type and venting |
| GR-76 | Poor communication — soft lock (Infiniti GS/GR tankless); Bradford White's table specifies poor communication with the display | A loose display cable, electrical noise, or a failing display/control | Clears when remedied; check the display connection first — board-level diagnosis is technician work |
| GR-78 | Cascade communication error — soft lock (Infiniti GS/GR tankless, cascaded multi-unit systems) | A broken communication link between cascaded units or a failed unit controller | Check cascade cabling; multi-unit commissioning faults are licensed technician work |
| GR-94 | Exhaust NTC detects vent temperature above 149°F (65°C) — 195°F (90°C) in commercial mode — hard lock (Infiniti GS/GR tankless) | Overheated exhaust: a scaled heat exchanger, restricted venting, or excessive firing rate for the vent | Descale the heat exchanger and verify the vent is clear and correctly sized; combustion-side diagnosis is licensed technician work |
| HD-62 | Fan speed not proved — a HOLD, not yet a lockout (eF Series ICON HD display, Battleship Grey generation). The control cannot prove the blower is running at the required speed; if the condition persists the hold becomes lockout 123 (defined only in the ICON HD Quick Service Guide — see UNVERIFIED) | A blocked vent raising blower load, a failing blower motor, or a wiring fault between blower and control | Clear the vent termination and check the blower runs freely; blower and control diagnosis are licensed technician work |
| HD-67 | Normally-closed vent safety circuit opened — a HOLD (eF Series ICON HD display). The exhaust collector pressure switch or the high temperature limit switch in the vent safety circuit has opened; the sequence shows 67 briefly, then the unit waits in pre-purge and escalates to lockout 137 if the circuit stays open | Restricted venting, exhaust collector overheating, or a failed switch in the safety circuit | Clear the vent and condensate path; the safety circuit switches are tested by a licensed technician — never jumper a vent safety circuit |
| HD-80 | High limit overheat condition — HARD lockout (eF Series ICON HD display). The tank-top water temperature has exceeded 207°F and the ECO/high-limit function has shut the heater down | A control or sensor fault letting the burner overrun, or a failed high limit | Bradford White's service manual: let the water cool toward approximately 120°F and have a qualified service agent correct the problem and reset the lockout in Service Mode — never force a restart on an overheated tank |
| HD-110 | Ignition failure — SOFT lockout (eF Series ICON HD display). The burner could not be lit or could not prove flame; the display shows 110 while the code is stored as 109 in Diagnostic History. The Quick Service Guide counts four ignition trials; the ICON HD service manual describes three attempts, then a 15-minute wait and three more | No gas or low gas pressure, a failed igniter, a dirty flame rod, or a blocked burner | Documented soft-lockout reset: in User Mode hold the lower right Reset button for 3 seconds. Repeated 110s mean the ignition fault needs a licensed technician — do not keep resetting |
| HD-137 | Normally-closed vent safety circuit opened — LOCKOUT (eF Series ICON HD display). This is the lockout form of hold 67: the vent safety circuit (exhaust collector pressure switch or high temperature limit switch) stayed open, the unit waits 5 minutes to restart, and the code is stored in Diagnostic History | A persistently restricted vent, an overheated exhaust collector, or a failed safety-circuit switch | Clear vent and condensate blockages first; clearing a stored safety lockout and testing the circuit are licensed technician work |
| L-02 | No burner operation during freeze protection mode (Infiniti L Series tankless) — Bradford White's table marks this one 'Service Call' | The freeze protection firing failed: ignition, gas or fan fault during a freeze-protection cycle | Call a licensed technician — freeze protection faults left alone risk a frozen, burst heat exchanger |
| L-03 | Power interruption during Bath Fill (Infiniti L Series tankless) | Power was lost mid-fill, so the bath fill cycle cannot complete safely | Turn off all hot water taps and press the ON/OFF button twice to reset the display, per Bradford White's table |
| L-10 | Air supply or exhaust blockage (Infiniti L Series tankless) | A blocked intake or exhaust termination, snow/debris at the vent, or a venting fault | Clear both terminations; if the code returns, a licensed technician checks the venting and fan |
| L-11 | No ignition (Infiniti L Series tankless) — ignition did not occur when commanded | Check that the gas is turned on at the water heater, the gas meter and the gas valve; also a failed igniter or no combustion air | Verify every gas shutoff in the chain is on (Bradford White's table lists them in that order); internal ignition parts are licensed technician work |
| L-12 | Flame failure (Infiniti L Series tankless) — flame was lost during operation | Check that the gas is turned on at the water heater, the gas meter and the gas valve; low/fluctuating gas pressure or a dirty flame rod also cause it | Verify the gas chain is fully on; repeated flame failure needs a technician to measure inlet gas pressure and clean the flame rod |
| L-14 | Thermal fuse (Infiniti L Series tankless) — the thermal fuse has operated | Overheating inside the unit severe enough to trip the one-shot thermal fuse | Licensed technician work only — a thermal fuse does not reset; the overheating cause must be found and the fuse replaced |
| L-16 | Over temperature warning (Infiniti L Series tankless) | Bradford White's table lists: restrictions in the combustion air/exhaust vent terminal, low flow or short-cycling, foreign material in the combustion chamber or exhaust, and a clogged heat exchanger | Clear the vent terminal and descale the heat exchanger; combustion chamber cleaning is licensed technician work |
| L-32 | Outgoing water temperature sensor fault (Infiniti L Series tankless) | A failed outlet thermistor or harness damage | Thermistor testing and replacement are licensed technician work |
| L-33 | Heat exchanger outgoing temperature sensor fault (Infiniti L Series tankless) | A failed heat exchanger outlet thermistor or harness damage | Thermistor testing and replacement are licensed technician work |
| L-34 | Combustion air temperature sensor fault (Infiniti L Series tankless) | A failed combustion air thermistor or harness damage | Thermistor testing and replacement are licensed technician work |
| L-52 | Modulating solenoid valve signal abnormal (Infiniti L Series tankless) | The modulating gas solenoid's drive/feedback signal is out of range | Gas valve components are licensed technician work — never open the gas train |
| L-61 | Combustion fan failure (Infiniti L Series tankless) | A failed combustion fan motor or its drive circuit | Fan replacement is licensed technician work |
| L-65 | Water flow control fault — the water flow control valve failed to close during Bath Fill (Infiniti L Series tankless) | A failed or jammed flow control valve | Bradford White's table directs: immediately turn off the water supply, discontinue Bath Fill, and contact a licensed contractor |
| L-71 | SV0, SV1, SV2 and SV3 solenoid valve circuit fault (Infiniti L Series tankless) | An open or shorted circuit in one of the gas solenoid valves | Gas solenoid circuits are licensed technician work |
| L-72 | Flame sensing device fault (Infiniti L Series tankless) | The flame rod/sensing circuit has failed or is shorted | Flame circuit diagnosis is licensed technician work |
| LC | Scale build-up in the heat exchanger (Infiniti L Series tankless) — a maintenance code; in the unit's maintenance history '00' is substituted for LC | Mineral scale insulating the heat exchanger, worst on hard water without treatment | Flush/descale the heat exchanger with a pump and descaling solution (or have a technician do it), and consider inlet water treatment to slow recurrence |
| LED strobe | Normal operation, not a fault (tank gas, ICON 1.0 Ultra Low NOx): an LED strobe — two quick flashes — with a three-second pause means the thermostat is calling for heat and the tank temperature is below setpoint | A normal call for heat is in progress | No repair needed; the burner should be lit or lighting |
| No LED | Not a fault flash (tank gas, ICON gas control): on millivolt ICON models (Defender / Ultra Low NOx atmospheric) the LED is dark because there is no pilot light and the control has no power; on line-powered ICON models (power vent, damper) it means no power to the unit or the switch is off | Pilot out (millivolt models) or no 120V supply / switch off (line-powered models) | Follow the lighting instructions on the water heater (millivolt) or restore power and verify 120 volts at the outlet (line-powered). If the pilot will not stay lit, call a licensed technician |
| Steady LED | Not a fault (tank gas, ICON gas control): a solid/continuously lit LED means the setpoint knob was recently turned to OFF and the control is in shutdown mode | The control knob was turned to the OFF position | None — wait until the LED goes out before attempting to relight, exactly as Bradford White's charts direct |
A code that is not in this table? Manufacturers add and retire codes between model years, and some displays abbreviate two-part codes. If your code is missing, note the full display exactly as shown (photograph it), check the tech sheet stored inside the machine, and search this site by the symptom — the fault family is usually identifiable from what the machine was doing when the code appeared.
How to reset / clear error codes on Bradford White water heaters
Each Bradford White system has its own documented reset, and they are not interchangeable. ICON gas control (tank): a TCO trip on TTW models resets by rotating the temperature knob to minimum for at least 6 seconds before returning it to the desired setting, and several sensor/valve faults direct the gas valve reset described in the model's Quick Service Guide; after any knob-OFF, wait until the LED goes out before relighting. eF Series, Honeywell generation: soft lockouts (62, 63) reset in User Mode with the lower right Lockout Reset button, and the control retries by itself 3 times every hour; all other codes are hard lockouts resettable only in Service Mode (Temperature Up + Select for 3 seconds, then Lockout Reset for 3 seconds) — service personnel only. eF ICON HD: soft lockout 110 resets by holding the lower right Reset button 3 seconds in User Mode; hard lockouts such as 80 are Service Mode only. Infiniti GS/GR: hard locks clear with the Power button after the cause is remedied; soft locks clear themselves when the condition clears. Infiniti K: press and hold ON/OFF for more than 3 seconds. One reset after fixing a cause is diagnosis; repeated resets are how a fault becomes damage.
How to diagnose any Bradford White water heater code
Work the problem in this order — and stop wherever gas piping, the burner compartment, venting or the temperature-and-pressure relief valve begins, because those belong to a licensed technician: (1) record the report exactly — a counted LED flash pattern, a numeric display code, or a smart-control alarm are three different languages, and a photograph or video beats a memory of any of them; (2) establish the water story: is there no hot water at all, water that runs cold mid-draw, or water but with a code — tankless codes split into ignition, flame, airflow/venting, flow and temperature families, and tank codes into ignition, sensor and control families, and the family picks the checks; (3) run the owner-level external checks for that family first: power and the unit's switch, the gas cock fully open, intake and exhaust terminations clear of snow, nests and debris, the inlet water filter or screen rinsed (tankless), the condensate trap and drain not blocked or frozen (condensing models), and on tank models the status light read before anything is reset; (4) reset once, the way the brand documents, and run hot water at one tap while you watch — a code that returns at the same stage (fan start, ignition click, flame light, sustained burn) is an active fault naming its stage, not a glitch; (5) everything past that line — flame sensors and igniters inside the burner, gas valves, heat exchangers, control boards — is professional work with the gas supply and a meter involved. Two standing cautions: never plug or cap a dripping T&P relief valve (it is reporting pressure or temperature, and it is the tank's last safety device), and treat any gas smell as an emergency — leave and call the gas utility. Scalding is the quiet hazard in every reset: a control fault that lets outlet temperature drift high is a reason to stop using the water on skin until the code is resolved.
Three flash languages hide inside the single name 'ICON'
The ICON name covers several gas-control generations whose flash charts genuinely differ, which is why a flash count quoted without a model or generation is meaningless. The Defender Safety System's Honeywell V2 chart is the smallest: green flashes are normal (one per four seconds with the pilot lit, one per second with the burner firing), yellow 2 flashes warn of low thermopile voltage, red 4 flashes are the temperature cut-out, red 5 flashes are an electronics/sensor/gas valve fault, and a solid red LED is just shutdown after the knob was turned off — that chart has no 3-flash fault at all. The Ultra Low NOx ICON 1.0 and 2.0 charts add meanings the V2 chart never had: 3 flashes for insufficient heating on ICON 1.0 (dropped again on 2.0), 6 for the chamber door sensor, 9 for accessory leak detection (2.0 only) and 10 for insufficient combustion air. The line-powered power-vent, damper and TTW controls speak a third dialect with compound patterns — 6-1 pilot failed to light, 6-2 safety circuit opened during the run, 8-1 vapor sensor short, 8-3 gas valve electronics — where stopping the count after the first group guarantees a wrong diagnosis. Always match the chart to the control generation on the rating plate before reading a single flash.
On the eF Series, holds are warnings and lockouts are verdicts — and 62 changes meaning
Both eF display generations separate conditions that are still developing from conditions that have shut the heater down, but they label them differently. The Honeywell generation locks out on almost every code and splits resets: 62 (maximum retries) and 63 (maximum recycles) are soft lockouts a user can clear from User Mode, while everything else — including 65, water over 200 degrees — is a hard lockout reserved for Service Mode. The ICON HD generation makes the staging explicit with hold codes: 62 means fan speed not proved and only escalates to lockout 123 if it persists, 67 means the vent safety circuit opened and escalates to 137, and alert 172 (sensor resistance invalid) degrades into 93. The trap is that 62 is a completely different fault on the two generations — an ignition retry lockout on Honeywell controls, a blower-proving hold on ICON HD — and the ICON HD also shifts numbers between display and history, showing 110 for ignition failure while storing 109 in the history a technician later reads. Quoting an eF code without its generation is how the wrong part gets replaced.
The Infiniti tankless lines share a name and almost nothing else
Bradford White's three tankless families report faults in three unrelated languages, and codes must never be carried across them. The Infiniti L Series uses plain two-digit numbers in the style of its platform (11 no ignition, 12 flame failure, 14 thermal fuse, LC for scale build-up — with '00' substituted for LC in the maintenance history). The Infiniti GS/GR models use their own two-digit set with hard and soft lock classes (11 ignition failed ten times, 29 condensate trap blocked, 45 water leak detection, 94 exhaust overheat) shown as flashing 'Er' codes on the controller, which remembers the ten previous faults. The Infiniti K Series abandons numbers entirely for letter families: A codes are temperature sensors, C codes are flue/flow/fan conditions, E codes are high-temperature and internal faults (E5 is the locked copper heat exchanger overheat), and F codes are control and gas-path faults. The padded spelling 'E05' seen on third-party lists appears in no Bradford White K document — the company writes E5. A K Series letter code looked up in an L or GS/GR table will produce a plausible, wrong answer, which is worse than no answer.
Less common and model-specific codes
Search data shows owners also meet these codes on Bradford White water heaters: AeroTherm, Heater, Series, White. They are not part of the core code list Bradford White publishes for most models — several are series-specific, abbreviated display readings, or codes carried over from a sister platform — so we do not publish meanings for them rather than guess. Treat them by symptom: note what the machine was doing when the code appeared (filling, draining, heating, spinning), run one full power cycle (5 minutes off), and if the code returns, match the symptom to the closest documented family in the table above and check the tech sheet stored inside your machine for the model-specific definition.
Related guides
Facts on this page were checked against manufacturer documentation: bradfordwhitecorp.s3.amazonaws.com · res.cloudinary.com · media.distributordatasolutions.com · bradfordwhitecorp.s3.amazonaws.com · docs.bradfordwhite.com · mans.io · www.manualshelf.com · www.manualshelf.com · homeappliance.manualsonline.com · mans.io · homeappliance.manualsonline.com · manuzoid.com · www.manualshelf.com · www.manualshelf.com · manuals.plus · xrefs.plumbersstock.com · manualmachine.com · mans.io · mans.io · mans.io · mans.io