Goodman furnace codes
A furnace reports faults on a small status LED on the control board, seen through the sight glass in the blower door, or on a two-digit display. Watch a full cycle of the pattern and count the flashes, including the pause between groups, before you decide what you saw. The code chart is on the label inside the blower door.
Models covered: GM9S80, GC9S80, GMEC96.
All 24 codes
E0Ignition lockout after repeated failed ignition (pro repair)E1Pressure switch closed at the start of the heating cycle (pro repair)E2Pressure switch circuit not closed (pro repair)E3Primary limit circuit open (pro repair)E4Flame sensed with no call for heat (pro repair)E5Open fuse or short in low voltage wiring (DIY)E6Low flame sense signal (pro repair)EbGas valve not energized when it should be (pro repair)ECGas valve energized when it should not be (pro repair)E10Grounding fault or poor neutral connection (pro repair)E11Open rollout switch (pro repair)1 FlashFlame sensed when no flame should be present (pro repair)2 FlashesPressure switch stuck closed or inducer error (pro repair)3 FlashesFirst stage pressure switch stuck closed or inducer error (pro repair)4 FlashesOpen limit switch (pro repair)5 FlashesOpen rollout switch or open fuse detected (pro repair)6 FlashesPressure switch cycle lockout (pro repair)7 FlashesExternal lockout (retries) (pro repair)8 FlashesExternal lockout (recycles) (pro repair)9 FlashesGrounding problem or reversed polarity (pro repair)10 FlashesGas flow with no call for heat (pro repair)11 FlashesLimit switch open, blower failure (pro repair)12 FlashesIgnitor relay failure (pro repair)Steady OnInternal gas valve error, micro and frequency check (pro repair)
About Goodman codes
This page lists the fault codes this brand documents, with likely causes and a short repair path. The codes apply to model numbers such as GM9S80 and GC9S80; check the label on your unit to confirm yours.