Bradford White Flash Codes: What the Blinking Status Light Means

A Bradford White tank water heater on the ICON (Honeywell) gas control has no display and no error numbers — it talks through one status LED on the gas valve, blinking counted patterns separated by a three-second pause. This chart collects every flash pattern Bradford White documents across its own Quick Service Guides and I&O manuals: the Defender Honeywell V2 chart, the Ultra Low NOx ICON 1.0 and 2.0 charts, and the power-vent, damper and TTW charts with their compound two-group patterns. Because the same count means different things on different control generations, every pattern below names the models it belongs to — find your control first, then count.

Reading the ICON gas control: find your chart before you count

Bradford White sells the ICON gas control in several generations, and the company publishes a different flash chart for each one. The residential atmospheric Defender Safety System models use the Honeywell V2 chart, the simplest of the family: green light for normal states, yellow for one warning, red for faults. The Ultra Low NOx atmospheric models use the ICON 1.0 chart (serial number prefix TA, January 2019 and before) or the ICON 2.0 chart (TA, January 2019 and later), which between them cover counts the V2 chart never uses. Power-vent, power-direct-vent, fan-assisted and damper models, and the older TTW line, run a line-powered control whose chart includes compound patterns — a first group of flashes, a pause, then a second group — so 6 flashes followed by 1 flash is a completely different fault from 6 flashes alone. The reading method is the same everywhere: watch the LED through at least two full cycles, count the flashes in each group before the three-second pause, and note the colour where your chart uses colour. A phone video helps, because miscounting by one flash changes the diagnosis entirely. Match the chart to the model and serial on the rating plate before acting on any count.

1 flash, 2 flashes, the strobe and the bright/dim light: normal states and the one early warning

Most of what the LED does is not a fault at all. One flash every four seconds (green on the Honeywell V2 chart) means the pilot is lit, the main valve is off and the thermostat is satisfied — the heater is standing by at temperature. One flash every second (green on V2) means the main valve is open and the burner is lit. On ICON 1.0, a strobe — two quick flashes — with a three-second pause is the call-for-heat signal, and on power-vent and damper models an alternating bright/dim LED says the same thing: the thermostat wants heat and the burner should be firing or lighting. The first genuine warning is 2 flashes. On atmospheric models (yellow on the V2 chart) it means a weak pilot signal — low thermopile voltage with the main burner not lit — pointing at an unstable pilot flame, a dirty pilot assembly or loose thermopile connections; the Eco-Defender documentation adds that the system resets itself when the flame is sufficient again. The same count on a power-vent ICON means something unrelated: the pressure switch is stuck closed, the safety circuit reading closed at start-up when it should be open, so the control waits and cycles the blower trying to prove the circuit. Treating a power-vent 2 as a pilot problem wastes a callout; the model decides the meaning.

3 flashes in depth: the count that splits three ways

Three flashes is the most misquoted Bradford White pattern, because it has two documented meanings and one large family where it does not exist at all. On ICON 1.0 atmospheric models, including the Eco-Defender line, 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. The Eco-Defender troubleshooting text links it to the thermowell and chamber temperature sensors being out of calibration, with a possible short, and Bradford White's ICON 1.0 Quick Service Guide adds the field checks — verify the gas pressure, confirm no water is flowing through the tank during the call (a running tap or a cross-connection can carry the heat away), and compare tank temperature against the setpoint. The system resets when heating recovers, so an occasional 3 after a huge hot-water draw is different from a 3 on every cycle. On power-vent ICON models, three flashes instead mean the pressure switch or temperature switch is stuck open: the control runs the blower but the safety circuit never closes, with the usual causes being a blocked vent, a blower not reaching speed, or damaged switch tubing and ports. And on the Defender Honeywell V2 chart there is no 3-flash fault whatsoever — if a V2 control seems to show three flashes, recount with a video, because the chart you need is a different generation's. In every case the switch and sensor testing behind a repeating 3 is licensed technician work; never jumper a pressure switch to prove a point.

4 flashes and 5 flashes: the temperature cut-out and a three-way split

Four flashes is the one count that agrees across every Bradford White chart: the temperature cut-out (TCO) limit has been reached and the control has shut down on excessive tank temperature — red on the Honeywell V2 chart. Bradford White documents the reset on the TTW control explicitly: rotate the temperature knob to minimum for at least 6 seconds, then return it to the desired setting; the power-vent procedure runs the blower until the control is reset. The causes named across the manuals are a thermowell sensor out of calibration, a faulty gas valve, or heat migrating through the plumbing — and the Eco-Defender text warns the system must be reset, it does not clear itself. One reset after checking the setpoint is reasonable; a second trip is a technician call, because a control that overheats repeatedly is protecting the tank from a real fault. Five flashes splits three ways. On the Defender V2 chart it means an electronics, sensor or gas valve fault, with the manuals noting the control may be wet or damaged and its two sensor elements may disagree. On Ultra Low NOx ICON 1.0 and 2.0 it is specifically a gas valve thermostat sensor fault, with a documented reset of the gas valve and replacement if the fault persists. On power-vent and damper ICON it means a false pilot flame sensed — the pilot valve stuck open — which is a gas valve replacement, not a reset candidate. Find your generation before deciding which 5 you have.

The 6 family: a sensor fault on atmospheric models, ignition faults on vented models

Six is where the ICON charts diverge most sharply. On Ultra Low NOx atmospheric models (ICON 1.0 and 2.0), a plain 6 flashes means the chamber door temperature sensor is out of specification; the Quick Service Guide pairs it with two cleaning jobs — the ScreenLok vapor screen in the chamber and the burner — because a starved, dirty burner skews chamber temperatures, and with an ohms check of the door sensor itself. On power-vent, damper and TTW controls there is no plain 6 at all: those charts use the compound 6-x patterns, where the second group carries the meaning. Six flashes then 1 flash (6-1) is pilot failed to light — a dirty or blocked pilot assembly, no gas flow, or a poor connection at the gas valve. Six then 2 (6-2) is the safety circuit opening during operation: a pressure or temperature switch opening mid-run on power-vent models, or the damper moving away from full open on damper models, which auto-resets after five minutes. Six then 3 (6-3) is pilot flame extinguished, and 6 then 4 (6-4) is a false pilot flame sensed, the pilot valve stuck open. The practical lesson is to keep watching after the first pause: an owner who reports 'six flashes' from a power-vent heater has only read half the code, and the second half is the difference between a pilot cleaning and a gas valve.

The 7 and 8 families: vapor protection, gas valve faults, and the 8-x compounds

Seven flashes is another generation split. On Ultra Low NOx ICON 1.0 it is a straight gas valve fault: reset the valve, and if the fault persists Bradford White directs replacement. On power-vent, damper and TTW controls, 7 flashes report the flammable vapor sensor (or its simulated resistive device) out of range — the sensor must read between 3.0 and 48 kOhms — and the TTW service manual details what happens if the reading stays high: the control flashes 7 then 1 through a resistive-delay verification, repeats the cycle, and lands in flammable vapor lockout. First action on any 7 is not electrical at all: check the area for actual flammable vapors — paint, solvents and fuel stored near a water heater are the hazard this sensor exists for — and only then treat it as a sensor or harness fault. Eight flashes alone belongs to ICON 1.0 atmospheric models: the pilot remains lit while the control knob is in the OFF position, a valve that has not shut off, with gas pressure to check and valve replacement as the documented outcome — a heater doing this should not be left in service. On the vented controls the 8-x compounds apply: 8-1 vapor sensor out of specification with a possible short, 8-2 thermowell sensor damaged or unplugged, 8-3 gas valve electronics fault, and 8-4 gas valve fault detected, the last two ending in gas valve replacement if a reset does not clear them. One honesty note: the older TTW50 service manual assigns its 8-then-3 pattern to temperature sensor faults (an open circuit, or the dual sensor elements disagreeing by more than 5.5 degrees) rather than electronics, so a TTW50 should be read by its own service manual, not the newer ICON guide.

9 and 10 flashes: leak detection and starved combustion air

The two highest counts belong to the Ultra Low NOx charts. Nine flashes appears only on ICON 2.0, and it is not a combustion fault at all: the accessory leak-detection module has sensed water and is reporting tank leakage through the control. The correct response is plumbing, not electronics — find the leak, shut off the water supply to the heater if it is actively leaking, and follow the accessory module's own instructions, which is where Bradford White sends you; a T&P discharge, a drain valve weep and a failing tank all present as 'water where it should not be,' and only one of them is cheap. Ten flashes, shared by ICON 1.0 and 2.0, means insufficient combustion air detected. The Quick Service Guide's work list is short and physical: check the resistance of the chamber door (RTD) sensor, clean the ScreenLok vapor screen — a lint- and dust-clogged screen is the classic cause in laundry-room installations — and clean the burner, then verify the venting is clear. Ten flashes that return after cleaning point at the sensor or at genuinely restricted air supply to the room, both of which are technician diagnoses rather than reset opportunities.

No light and steady light: the two states that are not fault codes

Two LED states generate more unnecessary service calls than any fault pattern. A completely dark LED means different things by platform: on millivolt atmospheric models (Defender, Ultra Low NOx) the control has no power because there is no pilot — the thermopile generates the control's electricity from the pilot flame, so a dark LED simply says the pilot is out, and the fix is the lighting procedure printed on the heater. On line-powered power-vent and damper models a dark LED means no power to the unit or the switch is off, so the checks are the outlet, the breaker and the unit's switch; the TTW control also shows a dark LED during its lockout timing cycle. The second non-fault is the steady, continuously lit LED (solid red on the V2 chart): the control knob was recently turned to OFF and the control is in its shutdown mode. Bradford White's direction on every chart is identical — wait until the LED goes out before attempting to relight. Owners who keep turning the knob during this window conclude the control has failed; it has not, it is finishing its shutdown. Neither state appears in any fault table because neither is a fault, and both are worth ruling out before a single flash is counted.

Diagnosis order when the LED is flashing a fault

Work the Bradford White flash charts in the order the manuals imply. First, identify the control generation from the model and serial number — Defender V2, Ultra Low NOx ICON 1.0 or 2.0, or a line-powered power-vent/damper/TTW control — because the generation chooses the chart. Second, record the full pattern on video: both flash groups on compound patterns, and the colour on V2 controls. Third, do the owner-level checks your specific code allows: pilot lit and stable, gas shutoffs open, intake and exhaust terminations clear, condensate line draining, ScreenLok screen and tankless-style filters clean, no water flowing through the tank during a heating call, setpoint sane. Fourth, perform at most one documented reset for your code — the knob-to-minimum TCO reset, or the gas valve reset where the Quick Service Guide calls for one. Anything past that point — thermopile and sensor ohms, pressure switch vacuum, gas pressure, gas valve replacement, vapor sensor testing — is licensed technician work, and Bradford White's charts say so by ending so many rows with 'replace the gas valve,' which is never an owner job. If the heater smells of gas, shows the pilot lit with the knob off (8 flashes on ICON 1.0), or trips its temperature cut-out twice, stop troubleshooting and call a professional.

Key takeaways

• Film the LED for 30 seconds instead of counting live — compound patterns (6-1, 8-3) are almost impossible to count reliably in real time, and the video settles arguments about which chart applies.
• Write the model and serial number down before calling anyone: the serial prefix and date decide whether the ICON 1.0 or ICON 2.0 chart — with different 3, 7 and 8 meanings — governs your heater.
• A flashing LED with no hot water is a diagnosis starting point, not a parts list — Bradford White's own charts end most fault rows at the gas valve, which is licensed work, so budget for a technician rather than a part.

Resetting the Bradford White water heater

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.

Frequently asked questions

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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