Goodman furnace 7 red flashes: External lockout — ignition retries exhausted
Seven red flashes means the furnace used all its ignition retries without proving flame and locked out. A retry is an attempt to light after a failure to light at all.
Applies to: Goodman GMEC96 and Amana AMEC96 two-stage gas furnaces with a three-colour diagnostic LED.
What it means
Goodman separates retries from recycles on this control, and this code covers retries specifically — attempts to establish flame that never succeeded. That distinction is useful. A retry lockout means the furnace never got a flame going, which points at gas supply, the igniter, or flame detection failing from the start. A recycle lockout, signalled by eight red flashes, means flame was established and then lost, which points at something destabilising a flame that did light. Knowing which one you have narrows the investigation considerably before anyone opens the furnace.
Most common causes
- No gas reaching the burners — a closed valve, an empty propane tank, or a supply interruption.
- A failed hot surface igniter.
- A flame sensor coated with oxide, so a real flame goes undetected from the first attempt.
- A flame sensor bent out of the flame path.
- The gas valve not opening.
- Poor grounding, which breaks the flame rectification circuit.
- Low manifold pressure, so no stable flame is established.
How to diagnose it
- Distinguish this from eight red flashes carefully. Retries and recycles point at different parts of the problem.
- Check whether other gas appliances work, which separates a supply problem from a furnace problem.
- Check the furnace's manual gas valve is open, and on propane that the tank has fuel.
- Watch a start attempt if the furnace has a sight glass. On a retry lockout the burners typically never light at all.
- Note whether the furnace produces heat occasionally, which would indicate a lockout being released on a timer.
How to fix it
- Restore the gas supply if that is the cause.
- Igniter replacement, flame sensor cleaning, and gas pressure testing are technician work.
- Do not reset repeatedly to force a run. Each reset delivers gas to a burner that may not light it.
- Tell the technician whether the burners light at all. That single observation splits the diagnosis in half.
Notes
The retry and recycle split is more informative than most furnace codes manage. It is worth reading the count carefully, because seven and eight point at genuinely different failures despite both being lockouts.
Related
All codes for this manufacturer
Goodman and Amana furnace fault codes — every code, with what differs between models.
Not sure this is your brand?
The same count means something else on other furnaces. What 7 flashes means on every brand puts them side by side.
Models this code appears on
From the manufacturer's per-model database. If your model is not listed, this code may not exist on your board, or it may mean something different — check the model page.
The same fault on other control families
Running out of ignition retries is the single most standardised lockout in gas heating — nine brand families on this site define it the same way. York's seven red flashes matches this board's definition nearly exactly, including the one-hour automatic reset; Carrier calls it code 14, ignition lockout, Trane two flashes, Lennox Watchguard alert 270. The shared logic: the furnace is allowed a fixed number of attempts to light and prove flame, and this code means all of them were spent.
What the fix costs
The usual culprit behind exhausted retries is the hot surface ignitor, and the ignitor cost guide prices that honestly: $150–350 installed on a standard visit, against a part that costs $20–60 universal or $40–120 OEM — with the after-hours version at $250–500, which is the strongest argument for acting on this code before a cold night does. But retries can also be spent on a weak gas supply or a flame-proving failure, so the diagnosis matters: a $75–150 diagnostic that identifies a dirty flame sensor instead ($80–200 to clean per the repair cost guide) is a much better outcome than a parts-swapped ignitor that changes nothing.
DIY or call a pro?
The one-hour lockout means a single deliberate reset is a legitimate test — if the furnace lights and holds on the next attempt, you have breathing room to book a normal visit. What is not legitimate is making that reset a routine: a furnace that needs resetting every day is spending its retries against a real fault, and each cycle dumps a little unburned gas into the heat exchanger before lockout. Ignitor replacement itself is famously simple mechanically, but on this board the code cannot tell you it is the ignitor rather than the gas valve or flame sensing — and gas-adjacent guesswork is where DIY stops. Confirm the diagnosis professionally, then decide.
What this looks like
From the outside, this usually shows up as the furnace turns over but never lights — that walkthrough covers what to check in order, and when it stops being a homeowner job.