Goodman/Amana furnace flash codes, decoded

What this error means

The red-LED language on Goodman and Amana furnace boards (shared platform): steady ON = normal standby, slow flash = normal heating. Faults: 1 flash = ignition failure lockout (auto-retries after ~1 hour; the classic cause is a dirty flame sensor), 2 = pressure switch stuck closed, 3 = pressure switch stuck open (blocked vent, failed inducer, condensate clog), 4 = open high limit (airflow — the filter), 5 = flame sensed with gas off (SAFETY — stop), 6 = rollout switch open (SAFETY — stop), 7 = weak flame signal, 8 = igniter circuit fault. Continuous rapid flashing = reversed line polarity/grounding — an electrician fix.

Symptoms

• Red LED blinking in counted groups (view through the door sight glass)
• No heat, or short cycles

Try this first (safe DIY steps)

1. Count the flashes between pauses and write the number down
2. 4 flashes: replace the filter and open registers before anything else
3. 3 flashes: check the intake/exhaust terminations outside for snow, ice, nests
4. 1 or 7 flashes: the flame sensor likely needs cleaning (see our universal guide) — one power cycle allowed
5. NEVER repeatedly reset a 1-flash lockout (unburned gas risk), and treat 5 or 6 flashes as a shutdown-and-call event

Safety: power off before any physical intervention. Never bypass covers or interlocks — fuser areas run hot enough to burn.

When to call a technician

5 flashes (flame with gas off) and 6 flashes (rollout) are gas-safety events — professional only, and rollout switches must never be bypassed.