Goodman Furnace 5 Flashes: What the Blinking Light Means & Fixes
On Goodman's single-stage boards: flame sensed without the gas valve energised — the GMES80 wiring diagram prints it verbatim: '5 FLASHES = FLAME SENSE WITHOUT GAS VALVE [ENERGISED]'. On Goodman's two-stage boards the same count means something else entirely: open rollout switch or open control board fuse. The generation split is documented in the what — read it before acting on any of it.
Goodman's 5-flash is the clearest example on this site of why the door chart, not the flash count, is the diagnosis. Goodman publishes two residential board generations whose charts disagree at this number. On single-stage boards (the GMES80 generation), five flashes is a flame-safety report: the control is sensing flame with no call for heat and the gas valve not energised — Goodman's wording is 'flame sense without gas valve', and its verified cause list is a leaking gas valve, a lingering flame, or a shorted flame sensor signal. The furnace must not run on it: uncommanded flame and a lying safeguard are the same two bad stories as every other brand's version of this fault. On two-stage boards (the GMVC96/GCEC96 generation), five flashes belongs to a different system entirely — the limit circuit. Goodman's two-stage troubleshooting chart defines it as: limit and rollout circuit open for 15 minutes; open control board fuse or rollout switch. The control's internal logic, spelled out in Goodman's servicing text, is a timing ladder: when the limit circuit opens, the control first reports 4 flashes (open limit); if the circuit is still open past 5 minutes it assumes blower failure and reports 11 flashes; if it is still open past 15 minutes it concludes a manual-reset device — the rollout switch — or the board fuse has opened, reports 5 flashes, enters a one-hour lockout, and runs the inducer continuously. And on those same two-stage boards, where did flame-sensed go? To 1 flash ('flame sensed with no flame present'). Goodman's newest communicating and R-32 models render the flame fault in letters instead (EE4: flame detected when no flame should be present). So a Goodman owner with five flashes owns one of two completely different furnaces' worth of trouble — a gas-valve/flame problem or a rollout/fuse problem — and the first diagnostic act is not touching the furnace at all: it is establishing which board generation is flashing, from the model number and the chart inside the door.
What causes the 5 Flashes code on a Goodman furnace?
Leaking gas valve (single-stage flame branch)
Goodman's verified lead cause for flame-sensed: the valve passes gas it should hold back, so a genuine flame exists — or re-establishes — with the valve de-energised and no call for heat. The sensor is telling the truth; the valve's shutoff is what failed.
Lingering burner flame (single-stage flame branch)
Flame that fails to go out cleanly when the cycle ends keeps the sensor proved past the control's allowance. Five flashes that arrive specifically in the moments after a heating cycle, on a single-stage board, tell this story first.
Shorted flame sensor signal (single-stage flame branch)
The false-report branch from Goodman's verified list: flame sensor wiring shorted so the control receives a flame-present signal with no flame at all. Proven by the gas-shutoff test — the report persists on a furnace whose manual gas valve is closed.
Open rollout switch (two-stage board branch)
On two-stage boards, 5 flashes is the control concluding that a manual-reset device opened — pre-eminently the rollout switch, which trips when burner flames roll out of the heat exchanger from a blocked flue, failed inducer, burner misalignment or exchanger problem. A rollout is a fire-guard event: the switch is the messenger, the rollout is the message.
Open control board fuse (two-stage board branch)
The same two-stage report covers the board's low-voltage fuse standing open — usually because a short in the 24-volt wiring opened it. Goodman's two-stage troubleshooting row pairs the checks exactly: control board fuse, then the limit-circuit family (temperature rise, duct static, gas pressure, burner alignment, orifice plate position, wiring to all limits). A fuse replaced without finding its short simply opens again.
Checks to run before you replace anything
- FIRST, IDENTIFY THE BOARD: read the model number and the diagnostic chart inside the furnace door before interpreting the count. GMES80-generation (single-stage) chart: 5 flashes is the flame fault. GMVC96/GCEC96-generation (two-stage) chart: 5 flashes is rollout/fuse, and flame-sensed is 1 flash. Acting on the wrong generation's meaning is the standing error with this code — websites that print a single Goodman meaning for 5 flashes are mixing the two charts.
- SAFETY, BOTH BRANCHES: if you smell gas, or can see flame with no call for heat, furnace off, gas off at the manual valve if you know it, and call your gas utility or a licensed technician. On the rollout branch: never reset a rollout switch yourself and never keep resetting the furnace — a rollout switch that has opened is reporting flame where flame must never be.
- Confirm the count through two full repetitions (five flashes, pause, repeat) and check for companion behaviour that sorts the branches: on the two-stage board, the 5-flash state comes with the inducer running continuously and a one-hour lockout; a single-stage flame fault typically shows at standby or just after a cycle.
- Look through the burner sight glass with no call for heat: any flame present is the leaking/stuck valve branch introducing itself — furnace off, technician now. No visible flame does not clear the valve (a small internal flame may not show), but it moves wiring and sensing up the list on the flame branch.
- Note the history for the technician: did the furnace overheat or run the blower strangely before faulting (which fits the two-stage limit-ladder story — 4 flashes, then 11, then 5 across 15 minutes), or did the code appear at standby with the furnace cold (flame branch)? The sequence you watched is diagnostic evidence; write it down rather than resetting it away.
- Do not open the control compartment to 'check the fuse' as an owner on either branch. On the flame branch the fuse is irrelevant; on the two-stage branch the fuse is a technician's clue (it opened for a reason — a 24-volt short), not an owner's consumable. Fuse and rollout work on this code is licensed work.
How to fix goodman furnace 5 flashes?
- Single-stage flame branch — the owner's fix is the same as every brand's version of this fault: furnace off, licensed HVAC technician booked. The technician's branch test (manual gas valve shut: report dies = the valve was passing gas and is replaced; report persists on a gas-less furnace = the sensing chain is repaired — wiring or sensor, control last) is described under Trane's identical fault and applies here part for part.
- Two-stage branch — replace nothing until the open device is identified: the technician establishes whether the rollout switch or the board fuse is the open point in the limit circuit, because they demand opposite kinds of repair (a combustion/venting cause hunt versus a 24-volt short hunt).
- Rollout proven: the repair is the rollout's cause — clear the blocked flue or vent, correct burner alignment or orifice plate position, restore inducer performance — and only then is the manual-reset rollout switch reset, by the technician, as the last step of the repair, never the first step of a trial.
- Fuse proven: find and repair the 24-volt short (thermostat or component wiring rubbed through is the usual find), then replace the fuse with the correct 3-amp part. A fuse installed into an unfound short is a second blown fuse on a schedule.
- Airflow causes behind a limit-circuit story are corrected as part of the same visit where they contributed: Goodman's two-stage row lists temperature rise and duct static among its checks, so a choked filter or closed-off registers that overheated the furnace get fixed alongside the open device, or the ladder climbs again.
- Proof, both branches: complete heating cycles, then a standby watch. The flame branch must sit cold and silent with no report; the two-stage branch must run full cycles without the limit ladder starting (no 4-flash preamble) and hold heat normally.
The part that usually fails: Generation-dependent: gas valve or flame-sensing chain (single-stage) — rollout switch's cause or the 3-amp board fuse plus its short (two-stage)
Naming a part for Goodman 5 flashes before naming the board generation is the error this entry exists to prevent. Even within the two-stage branch, the named devices (rollout switch, fuse) are almost never the part to buy — they are pointers to their causes, and both are replaced or reset only after those causes are repaired.
How to reset goodman furnace error code 5 flashes?
The reset story splits with the generation, like everything else on this code. Single-stage flame branch: there is no sanctioned owner reset — power-cycling clears the display but the fault is a stop-and-call condition, and it clears for real only when the flame report is honestly gone after repair. Two-stage branch: Goodman's servicing text gives the behaviour precisely — after 15 minutes with the limit circuit open, the control enters a one-hour lockout (inducer running continuously); the lockout expires on its own after the hour, or the control board can be reset by cycling 115-volt power to the furnace — but cycling power into an open rollout or a blown fuse changes nothing, because the circuit is still open when the control wakes. The rollout switch itself is manual-reset and belongs to the technician after the cause is found. In both generations the rule is identical in spirit: resets clear states, not causes, and this code's causes are a gas valve, a flame safeguard, a fire-guard switch, or a short — none of which a reset touches.
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.
Why does my goodman furnace keep showing 5 flashes?
A returning code means the unfixed branch is still talking. Flame branch returns sort by timing exactly as the sibling brands' do: after cycles (valve or lingering flame) versus at cold power-up (sensing chain). Two-stage returns mean the limit ladder is climbing again — watch for the 4-flash preamble on earlier cycles, which is the overheating story restarting — or the replacement fuse has met the same unfound short. In every case the return is information to hand the technician, recorded with its timing, not a prompt to reset harder.
How to stop 5 Flashes coming back
- Leaking gas valve (single-stage flame branch): Goodman's verified lead cause for flame-sensed: the valve passes gas it should hold back, so a genuine flame exists — or re-establishes — with the valve de-energised and no call for heat. The sensor is telling the truth; the valve's shutoff is what failed.
- Lingering burner flame (single-stage flame branch): Flame that fails to go out cleanly when the cycle ends keeps the sensor proved past the control's allowance. Five flashes that arrive specifically in the moments after a heating cycle, on a single-stage board, tell this story first.
- Shorted flame sensor signal (single-stage flame branch): The false-report branch from Goodman's verified list: flame sensor wiring shorted so the control receives a flame-present signal with no flame at all. Proven by the gas-shutoff test — the report persists on a furnace whose manual gas valve is closed.
Retrieving stored fault 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.
Other Goodman furnace error codes
| Code | Meaning | First fix |
|---|---|---|
| 1 FLASH | System lockout after excessive ignition retries; two-stage boards: flame sensed with no flame present | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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). | 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 | 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 | 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 | Control board replacement is required; call a licensed HVAC technician |
See the full list on the Goodman Furnace error codes hub.
Codes 5 Flashes gets confused with
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. Goodman's fault language is (a) LED flashes on the control board for standard models and (b) E-prefixed codes on communicating (ComfortNet) systems.
H6 — Not a standard published Goodman furnace fault code — decode via the model's LED blink pattern / communicating-system chart and the observed symptom. 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).
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). Like F02, '9H' doesn't appear in Goodman's standard published furnace fault systems.
Frequently asked questions
What does 5 flashes mean on a Goodman furnace?
It depends on the board generation — Goodman publishes both. Single-stage boards (GMES80 generation): flame sensed without the gas valve energised, a flame-safety fault. Two-stage boards (GMVC96/GCEC96 generation): open rollout switch or open control board fuse, declared after the limit circuit has been open 15 minutes. Your model number and door chart say which furnace you have; anyone quoting one meaning without asking your model is guessing.
Why do websites disagree about Goodman 5 flashes?
Because both meanings are genuinely Goodman's, printed on different generations' charts, and third-party lists copy one chart or the other (or blend them). The disagreement dissolves the moment the board is identified: single-stage chart, flame fault; two-stage chart, rollout/fuse — with flame-sensed moved to 1 flash on the two-stage chart. This is also why a technician's first question about this code is your model number.
My Goodman shows 5 flashes but there is no flame problem — why?
You almost certainly have the two-stage board, where 5 flashes never was a flame code: it is the control concluding, after the limit circuit stood open for 15 minutes, that the rollout switch or the board fuse has opened (Goodman's ladder: 4 flashes for the open limit, 11 flashes past 5 minutes, 5 flashes past 15, with a one-hour lockout and the inducer running continuously). The diagnosis is the limit circuit and its causes — airflow, venting, burner alignment, or a 24-volt short — not the flame sensor.
Can I just replace the blown fuse or reset the rollout switch?
Neither is an owner fix on this code. The fuse opened because something in the 24-volt circuit shorted; a new fuse meets the same short. The rollout switch opened because flame left the heat exchanger; resetting it without finding why defeats a fire guard. Both devices are replaced or reset by the technician as the final step of repairing their causes — Goodman's own troubleshooting row pairs the fuse check with temperature rise, duct static, gas pressure and burner alignment checks for exactly that reason.
How do I reset Goodman 5 flashes?
On the two-stage board, the one-hour lockout expires by itself, or the control can be reset by cycling 115-volt power — but with the rollout or fuse still open, the control simply re-declares the fault, so the reset only becomes meaningful after repair. On the single-stage flame branch there is no owner reset to perform: the furnace stays off until the valve or sensing fault is repaired. In both cases a reset is the last step after a fix, never a substitute for one.
Is Goodman 5 flashes dangerous?
On the flame branch, yes in the same way as every brand's flame-sensed fault: gas may be moving uncommanded, or the flame safeguard may be lying. On the two-stage branch, the danger has usually already announced itself upstream — a rollout is flame escaping the exchanger, and the limit ladder that precedes the code is an overheating furnace. Either way the correct reading of five flashes on a Goodman is: stop, identify the generation, and call a technician.
What does goodman furnace 5 flashes mean?
On Goodman's single-stage boards: flame sensed without the gas valve energised — the GMES80 wiring diagram prints it verbatim: '5 FLASHES = FLAME SENSE WITHOUT GAS VALVE [ENERGISED]'. On Goodman's two-stage boards the same count means something else entirely: open rollout switch or open control board fuse. The generation split is documented in the what — read it before acting on any of it. Goodman's 5-flash is the clearest example on this site of why the door chart, not the flash count, is the diagnosis.
How to fix goodman furnace 5 flashes?
Start here: Single-stage flame branch — the owner's fix is the same as every brand's version of this fault: furnace off, licensed HVAC technician booked. The technician's branch test (manual gas valve shut: report dies = the valve was passing gas and is replaced; report persists on a gas-less furnace = the sensing chain is repaired — wiring or sensor, control last) is described under Trane's identical fault and applies here part for part. Two-stage branch — replace nothing until the open device is identified: the technician establishes whether the rollout switch or the board fuse is the open point in the limit circuit, because they demand opposite kinds of repair (a combustion/venting cause hunt versus a 24-volt short hunt).
How to reset goodman furnace error code 5 flashes?
The reset story splits with the generation, like everything else on this code. Single-stage flame branch: there is no sanctioned owner reset — power-cycling clears the display but the fault is a stop-and-call condition, and it clears for real only when the flame report is honestly gone after repair. Two-stage branch: Goodman's servicing text gives the behaviour precisely — after 15 minutes with the limit circuit open, the control enters a one-hour lockout (inducer running continuously); the lockout expires on its own after the hour, or the control board can be reset by cycling 115-volt power to the furnace — but cycling power into an open rollout or a blown fuse changes nothing, because the circuit is still open when the control wakes. The rollout switch itself is manual-reset and belongs to the technician after the cause is found. In both generations the rule is identical in spirit: resets clear states, not causes, and this code's causes are a gas valve, a flame safeguard, a fire-guard switch, or a short — none of which a reset touches.
Why does my goodman furnace keep showing 5 flashes?
A returning code means the unfixed branch is still talking. Flame branch returns sort by timing exactly as the sibling brands' do: after cycles (valve or lingering flame) versus at cold power-up (sensing chain). Two-stage returns mean the limit ladder is climbing again — watch for the 4-flash preamble on earlier cycles, which is the overheating story restarting — or the replacement fuse has met the same unfound short. In every case the return is information to hand the technician, recorded with its timing, not a prompt to reset harder.
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