Goodman Furnace 8 Flashes: Igniter Relay Problem Fix
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Goodman furnace 8 flashes: what it means
Eight flashes on your Goodman furnace’s diagnostic LED means an igniter relay problem — check igniter: the control board is not seeing the expected current draw through the hot-surface igniter circuit. In plain terms, when the board tries to energize the igniter, the current it expects isn’t there.
This is a control-circuit fault, not a gas or flame problem. The failure lives in one of three places:
- The hot-surface igniter itself (cracked, open, or worn out)
- The wiring, plug, or connector feeding the igniter
- The igniter relay on the control board that switches power to it
Because every one of these repairs is inside the cabinet and involves line voltage, this is a pro-level code. The one thing a homeowner can safely do is a single power reset — everything else is technician work.
Flash-code legends can differ between board revisions. Confirm the meaning against the label printed inside your furnace’s blower-door before acting.
Goodman furnace 8 flashes: common causes, ranked by probability
- Failed or cracked hot-surface igniter. These are consumable parts. A hairline crack or an open element stops drawing current, and the board reports no igniter current — the single most common trigger.
- Loose, corroded, or damaged igniter wiring/connector. A backed-out pin or chafed wire breaks continuity between board and igniter.
- Control board fault (igniter relay or related electronics). The relay contacts that switch power to the igniter can stick or burn open so voltage never reaches a perfectly good igniter, or the board’s current-sensing electronics can misreport the circuit. Both look identical from the homeowner’s side — no glow, eight flashes — and both are fixed the same way: board replacement.
Standard practice is to verify the igniter and its wiring before condemning the board, so causes 1 and 2 should be tested and ruled out first.
How to fix Goodman furnace 8 flashes: safe checks first
These are the only steps a homeowner should attempt:
- Thermostat: Confirm it’s set to Heat and the setpoint is above room temperature. Replace the thermostat batteries if it uses them.
- Breaker / furnace switch: Make sure the furnace breaker is on and the wall switch by the unit hasn’t been flipped off.
- One reset: Turn the furnace off at the breaker or switch, wait 30 seconds, and turn it back on to give the board a single clean ignition attempt.
- Blower door: Make sure the exterior blower-access panel is fully seated — the door switch must be closed for the furnace to run.
Unrelated no-heat basics: while you’re there, confirm the air filter is clean and seated and that supply and return vents are open — neither causes an 8-flash code, but both cause no-heat complaints.
If the 8-flash code returns after that single reset, stop and call a licensed HVAC technician. Do not open the cabinet, and do not repeatedly reset a unit that keeps locking out.
How a technician will diagnose it
A pro will work the igniter circuit in this order, so you can sanity-check the quote:
- Read the flash count and history to confirm 8 flashes and rule out an intermittent fault.
- Power down and inspect the igniter — visual check for cracks, then measure resistance with a multimeter. An open reading confirms a bad igniter.
- Check the igniter wiring and connectors for continuity, corrosion, and secure seating at both the board and igniter ends.
- Measure board output voltage at the igniter connector during the igniter-on period of a heat call. Voltage present but no current (no glow) confirms an igniter/wiring fault; no voltage at the connector points to the relay or board.
- Confirm the fix by cycling a full heat call and verifying the igniter glows, gas lights, and flame proves without the code returning.
Expect a clear answer on whether the igniter, the wiring, or the board is at fault before any part is replaced.
Symptom, cause and what to do
| Symptom | Likely cause | DIY action | Technician job |
|---|---|---|---|
| 8 flashes, igniter never glows, no heat | Cracked/open igniter | One reset, then call a pro | Test resistance, replace hot-surface igniter |
| 8 flashes intermittent, sometimes heats | Loose/corroded igniter connector | One reset, verify panel seated | Inspect, re-pin or repair wiring/connector |
| Voltage present at the igniter connector during the igniter-on period, but no glow | Open or cracked igniter (not the board) | None — call a pro | Confirm open igniter by resistance, replace igniter |
| No voltage at the igniter connector during the igniter-on period | Igniter relay / control board fault | None — call a pro | Verify board output, replace integrated control board |
| Code returns after every reset | Unresolved igniter-circuit or board fault | Stop resetting, call a pro | Full circuit diagnosis; replace igniter, wiring, or board as found |
| No flash / no power at all | Breaker or door switch | Check breaker, seat blower door | Test door switch, fuse, transformer |
Goodman furnace 8 flashes repair cost
Honest US ranges, parts plus labor:
- Homeowner reset / seated panel: $0
- Hot-surface igniter replacement: $150 – $350 (part is often $20–$70; the rest is labor and diagnosis)
- Igniter wiring / connector repair: $120 – $250
- Integrated control board replacement: $400 – $1,200 — the high end applies to two-stage and variable-speed/ComfortNet-style boards, tight or attic/crawlspace access, and after-hours or emergency calls
- Diagnostic / service-call fee alone: $80 – $180, usually credited toward the repair
Costs vary by region, furnace access, and whether your unit is under warranty. Goodman parts warranties can cover the igniter or board, leaving you the labor charge — but the extended coverage generally requires that the unit was registered within the enrollment window after installation and applies to the original owner at the original installation address. If it wasn’t registered, expect the shorter base parts warranty instead.
Related codes
Flash-code numbering is not the same across all Goodman/Amana board series — the same count can mean different things on different boards, and at least one of the codes below is a safety circuit on some legends. Always match the number against the legend printed on your own blower-door or control board before assuming a meaning.
- Goodman Furnace 7 Flashes: Low Flame Signal Fixes — flame-sensing issues after successful ignition.
- Goodman Furnace Lockout: Causes, Fixes & Costs — general lockout behavior and safe reset limits.
- Goodman Furnace 1 Flash — see your unit’s legend for the meaning on your board series.
- Goodman Furnace 6 Flashes — see your unit’s legend for the meaning on your board series.
Frequently asked questions
Can I fix a Goodman 8-flash code myself?
Usually no. This code points to the igniter circuit or control board relay — both are inside-cabinet, live-voltage repairs that require a licensed HVAC technician. Homeowners should limit themselves to one reset, filter and thermostat checks.
Does the 8-flash code reset by itself?
On most Goodman boards the control will attempt ignition again, but a genuine igniter-relay failure typically holds or repeats until the fault is repaired. Cycling power at the breaker gives it one clean retry; if it returns, call a pro.
Is it the igniter or the control board?
Both are possible. A cracked or open igniter, a broken wire or connector, or a failed igniter relay on the board can all trigger 8 flashes. A technician measures igniter resistance and checks for voltage at the igniter connector during the igniter-on period to tell them apart before quoting.