Goodman Furnace Error Codes List: Every Code Explained
Every Goodman furnace error code we could verify against Goodman'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.
How to read and retrieve error codes on Goodman furnaces
Goodman boards keep the last faults readable via the display/LED, and newer models expose fault history through the CoolCloudHVAC app and the onboard menu. The fault chart on the blower door remains the authority — Goodman reused similar-looking codes across board generations.
The complete Goodman furnace error code list
| Code | Meaning | Most likely cause | First fix |
|---|---|---|---|
| 1 FLASH | System lockout after excessive ignition retries; two-stage boards: flame sensed with no flame present | Failed ignition attempts, or gas valve stuck open or shorted flame sensor wiring | Check thermostat call and gas supply on; do not keep resetting, call a licensed HVAC technician |
| 2 FLASH | Pressure switch stuck closed before the inducer starts | Sticking pressure switch contacts, shorted switch wiring, or stuck inducer relay | Check vent terminations are clear; switch or board diagnosis needs a licensed HVAC technician |
| 3 DOUBLE FLASHES | Second-stage pressure switch stuck open during high-stage inducer operation | Blocked or pinched switch hose, vent restriction, or weak high-stage inducer draft | Clear vent and intake terminations; switch and draft testing by a licensed HVAC technician |
| 3 FLASH | Pressure switch failed to close (stuck open) when the inducer ran | Blocked vent or intake, clogged condensate drain, cracked switch hose, weak inducer | Clear vent and intake terminations and check condensate drain; further diagnosis by a licensed HVAC technician |
| 4 FLASH | Open high limit circuit; the furnace overheated and shut the burners down | Clogged filter, blocked registers or returns, failing blower, excessive temperature rise | Replace the filter and open all registers and returns; repeat trips need a licensed HVAC technician |
| 5 FLASH | Flame sensed without the gas valve energized; two-stage boards: open rollout or blown fuse | Leaking gas valve, lingering flame, open rollout switch, or open control board fuse | Turn the furnace off; gas valve, rollout and fuse faults need a licensed HVAC technician |
| 6 FLASH | Single-stage boards: open rollout switch; two-stage boards: pressure switch cycling lockout | Rollout from blocked flue or cracked heat exchanger, or pressure switch opening repeatedly | Turn the furnace off and do not reset repeatedly; call a licensed HVAC technician |
| 7 FLASH | Single-stage boards: low flame sense signal; two-stage boards: lockout after excessive ignition retries | Coated flame sensor, weak gas pressure, or flame never proven during ignition trials | Check gas supply to the home is on; sensor and gas work needs a licensed HVAC technician |
| 8 FLASH | Lockout after excessive recycles; flame was proven, then lost repeatedly | Interrupted gas supply, low gas pressure, opening pressure switch, or failing flame sensor | Do not keep power-cycling; gas pressure and burner diagnosis need a licensed HVAC technician |
| 9 FLASH | Improper grounding or reversed 115-volt polarity at the furnace | Hot and neutral supply wires reversed, or missing equipment ground | Do not operate; correct wiring polarity and grounding via a licensed HVAC technician or electrician |
| 9H | Not a standard published Goodman furnace fault — treat as a platform/display-specific reading to be decoded with the model number (Goodman's systems are LED blink codes and E-codes on communicating models). | Display/thermostat rendering from a communicating system | Follow the decoded fault's family playbook (ignition/limit/pressure as applicable). |
| 10 FLASH | Gas valve energized or gas flowing with no call for heat | Shorted gas valve wiring, or control board output fault energizing the valve | Shut off gas and power to the furnace; call a licensed HVAC technician immediately |
| 11 FLASH | Limit switch circuit open over five minutes, suggesting blower failure | Failed circulator blower, or limit circuit still open after overheating | Replace the filter and check the blower runs; blower repair needs a licensed HVAC technician |
| 12 FLASH | Control board igniter relay is not energizing the igniter | Failed igniter relay on the integrated control board | Control board replacement is required; call a licensed HVAC technician |
| A2L | R-32 models: A2L refrigerant alarm active (leak, communication, internal, or relay alarm) | Refrigerant leak detected by the mitigation sensor, or sensor communication failure | Do not ignore or bypass the alarm; refrigerant leak work needs a licensed HVAC technician |
| CONTINUOUS OFF | LED off: no power reaching the control, or control failure | Tripped breaker, open door or disconnect switch, blown board fuse, no 24V power | Check breaker, furnace switch and door seating; fuse or board work needs a licensed HVAC technician |
| CONTINUOUS ON | Steady LED: normal standby or operation; solid red on two-stage boards means internal control fault | No fault on single-stage boards; failed control board on two-stage boards | No action if heating normally; if solid red and dead, call a licensed HVAC technician |
| E0 | Communicating models: lockout from excessive ignition retries or flame recycles (three total) | No gas to burners, bad igniter, coated flame sensor, or lost flame after lighting | Confirm gas supply and thermostat call; ignition and gas faults need a licensed HVAC technician |
| E1 | Communicating models: low-stage pressure switch circuit closed at start of heating cycle | Low-stage pressure switch contacts sticking, or short in pressure switch wiring | Check vent terminations are clear; switch replacement is licensed HVAC technician work |
| E2 | Communicating models: low-stage pressure switch circuit did not close | Blocked switch hose, blocked flue or intake, clogged drain, or weak inducer | Clear intake and vent terminations and check condensate drain; then a licensed HVAC technician |
| E3 | Communicating models: primary high limit open; insufficient air over the heat exchanger | Blocked filter, restrictive ductwork, wrong blower speed, or failed blower motor | Replace the filter and open registers and returns; repeat trips need a licensed HVAC technician |
| E5 | Communicating models: open control board fuse in the low-voltage circuit | Short in 24-volt thermostat or component wiring blowing the 3-amp fuse | Check thermostat wiring for damage; fuse and short tracing by a licensed HVAC technician |
| E6 | Communicating models: weak flame; flame sense microamp signal is low | Coated or oxidized flame sensor, misaligned sensor, or lazy flame from gas pressure | Flame sensor cleaning or replacement and gas checks need a licensed HVAC technician |
| E7 | Communicating models: problem with the igniter circuit | Improperly connected or shorted igniter, poor unit ground, or board igniter relay fault | Igniter and control board work is licensed HVAC technician work; do not touch the igniter element |
| E11 | R-32 models (display E11): open rollout switch | Flame rollout from blocked flue passages, cracked heat exchanger, or failed inducer | Turn the furnace off and do not reset; call a licensed HVAC technician immediately |
| ED | Communicating models (display Ed): manual-reset rollout switch is open | Burner flames rolling out from blocked heat exchanger, misalignment, or displaced orifice plate | Turn the furnace off and do not reset the rollout; call a licensed HVAC technician |
| EE0 | R-32 models (display EE0): lockout due to excessive retries or recycles | Repeated failed ignition or flame loss beyond the control's retry limit | Confirm gas supply is on; repeated lockouts need a licensed HVAC technician, not repeated resets |
| EE1 | R-32 models (display EE1): pressure switch stuck closed | Sticking pressure switch contacts or shorted pressure switch circuit | Check vent terminations are clear; switch diagnosis is licensed HVAC technician work |
| EE2 | R-32 models (display EE2): pressure switch open; draft not proven | Blocked vent or intake, clogged condensate, damaged switch hose, weak inducer | Clear vent and intake terminations and check the condensate drain first |
| EE3 | R-32 models (display EE3): open high limit switch | Restricted airflow from clogged filter or blocked ducts overheating the furnace | Replace the filter and open all registers and returns; repeat trips need a licensed HVAC technician |
| EE4 | R-32 models (display EE4): flame detected when no flame should be present | Leaking gas valve, lingering burner flame, or shorted flame sensor signal | Turn the furnace off; gas valve faults need a licensed HVAC technician immediately |
| EE5 | R-32 models (display EE5): open control board fuse | Short in low-voltage wiring blowing the board fuse | Inspect thermostat wiring for nicks or rub-through; replacement by a licensed HVAC technician |
| EE6 | R-32 models (display EE6): low flame signal | Coated flame sensor or weak flame from improper gas pressure | Flame sensor and gas pressure work is licensed HVAC technician work |
| F02 | Not a standard Goodman consumer fault rendering — Goodman furnaces report faults with board LED blink patterns and, on communicating models, E-codes (E02 etc.). 'F02' is most likely a mis-read blink count or a communicating-thermostat rendering; decode via the model's chart. | Blink-code miscount | Diagnose the decoded code/symptom system with the model chart (ignition, pressure, limit families as applicable). |
| H6 | Not a standard published Goodman furnace fault code — decode via the model's LED blink pattern / communicating-system chart and the observed symptom. | Thermostat/communicating display rendering | Diagnose the decoded system (ignition, pressure switch, limit, flame sense — the Goodman families). |
| RAPID FLASH | Single-stage boards: reversed line polarity; two-stage boards: twinning wiring error | Reversed 115-volt hot and neutral, poor ground, or incorrect twin-furnace wiring | Correct supply wiring and verify ground; work for a licensed HVAC technician or electrician |
How to reset / clear error codes on Goodman furnaces
Goodman furnaces report faults as LED blink patterns on older boards and as alphanumeric codes on the 7-segment displays of newer (and ComfortBridge/Bluetooth) models. Codes clear when the fault ends and a heat cycle completes; lockouts need the cause fixed plus a power cycle at the furnace switch.
How to diagnose any Goodman furnace code
Work the problem in this order — and stop at any point where gas, combustion or mains wiring is involved, because those belong to a licensed HVAC technician: (1) record the code exactly: count LED flashes slowly, twice, or photograph the alphanumeric display; (2) check the free things homeowners legitimately own: the thermostat is calling for heat, the furnace power switch and breaker are on, the filter is not clogged solid (a starved furnace overheats and locks out on limit codes), all vents and the return are open, and the condensate drain is not blocked on condensing models; (3) reset once — at the power switch, off for 30 seconds — then watch a full call for heat from the beginning: inducer, ignition, flame, blower, in that order; where the sequence stops is the fault family the code names; (4) a code that returns immediately is an active fault — do not keep resetting a lockout, especially any flame or limit code; (5) everything inside the burner compartment — flame sensor cleaning is the one grey area many manuals allow owners, but gas valves, burners, heat exchangers and control boards are professional work. If you smell gas at any point, leave and call the gas utility, not a helpline.
Blink codes, display codes and lockouts
Two generations of fault reporting live side by side on modern furnaces. Older and simpler boards report through a single LED: a repeating count of flashes, read slowly against the chart printed inside the blower door — that chart, for your exact model, outranks any list on the internet, including this one. Newer communicating furnaces show alphanumeric codes (the E-series in the table above) and store a fault history a technician can scroll. Both generations share the lockout idea: after a set number of failed attempts at the same step — ignition is the classic — the board stops trying for a period (often an hour, or until power is cycled) instead of cycling forever against a fault that could overheat or flood the burners with unburned gas. A furnace in lockout is not broken by the lockout itself; it is a furnace that has already failed the same step repeatedly and is waiting for someone to find out why.
Furnace codes are also seasonal in a way washer codes are not. The first cold snap produces a wave of ignition and flame codes from furnaces that sat idle all summer — oxidised flame sensors, spider-nested burners, pressure-switch hoses holding condensate from the cooling season. Deep-winter adds frozen condensate lines on high-efficiency models and intake/exhaust terminations blocked by snow or ice, which present as pressure-switch codes. A code that appears once, on the coldest night of the year, and never again has often met its cause already; a code that appears every cycle, in any weather, is a component asking to be tested.
The most searched Goodman furnace codes, in detail
9H — Not a standard published Goodman furnace fault
Like F02, '9H' doesn't appear in Goodman's standard published furnace fault systems. Where owners report 9H-style readings, they trace to communicating-thermostat displays or to mis-segmented characters. The honest route is identical: get the model number, read the board LED pattern properly (two full rounds), and diagnose by the observed symptom stage (inducer? ignition? flame? blower?). Goodman boards also store recent faults, which a technician can pull up directly.
Most likely cause: Display/thermostat rendering from a communicating system — The thermostat may show codes in its own format — its manual decodes them.
First check: Model number first; board LED count (two rounds); symptom stage noted.
If it keeps coming back: A repeatable pattern (same stage failure) is the best clue to record for a technician.
F02 — Not a standard Goodman consumer fault rendering
Goodman's fault language is (a) LED flashes on the control board for standard models and (b) E-prefixed codes on communicating (ComfortNet) systems. F02 doesn't appear as a standard Goodman furnace fault in either system. The likely truths: a blink pattern miscounted (count the flashes between pauses at the board sight glass), or an E02-style communicating code misread. Either way, the model number + its chart is the key — and the symptom (no heat? blower only? short cycles?) narrows the system regardless of the letters.
Most likely cause: Blink-code miscount — Board LEDs flash the code repeatedly with pauses — easy to miscount without watching two full rounds.
First check: Watch the board LED through the sight glass for two full pattern rounds and count carefully.
If it keeps coming back: If code-reading stays ambiguous, a technician reads the board's stored fault history in seconds.
H6 — Not a standard published Goodman furnace fault code
H6 follows the same pattern as F02/9H on Goodman equipment: it isn't in the standard published fault systems (LED blinks for standard models, E-codes for communicating ones). Treat any H-reading on a Goodman furnace as a prompt to do the two reliable things: count the control board's LED flashes through the sight glass across two full rounds, and observe which stage the furnace reaches before stopping (inducer → igniter glow → flame → blower). Stage + blink count identifies the system on any Goodman.
Most likely cause: Thermostat/communicating display rendering — Decoded by that thermostat's own manual.
First check: Board LED count (two rounds); stage observation; model number recorded.
If it keeps coming back: Consistent stage failure is the diagnostic gold — note exactly where the sequence stops.
Less common and model-specific codes
Search data shows owners also meet these codes on Goodman furnaces: 7P1, A11, B0, B1, B3, B4, E1C, ED8, F01, F03, F04, F09, F11, F4, F9, Fixes, Furnace, H9. They are not part of the core code list Goodman 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.
Frequently asked questions
How to check goodman furnace error codes?
Goodman boards keep the last faults readable via the display/LED, and newer models expose fault history through the CoolCloudHVAC app and the onboard menu. The fault chart on the blower door remains the authority — Goodman reused similar-looking codes across board generations.
Related guides
Facts on this page were checked against manufacturer documentation: www.manualshelf.com · www.manualshelf.com · www.manualshelf.com · manuals.plus · iwae.com · www.goodmanmfg.com