Goodman Furnace: Furnace in lockout – how to reset it
Furnace in lockout - how to reset it on a Goodman furnace: The furnace has stopped after its ignition retries and the control is flashing 1 on the LED. That is a lockout, and resetting it only clears the symptom, not the cause. Know the reset methods, but find out why it failed to light. Never bypass a safety to force it to run.
Applies to: GMES9, GCES9, AMES9, ACES9, VMES9, VCES9 (single stage, 92% and 96%)
Common causes of furnace in lockout - how to reset it
- Ignition failed three times (see 1 flash)
How to fix furnace in lockout - how to reset it: step by step
- Turn the thermostat call off for more than 5 seconds and less than 20 seconds, then call for heat again.
- Or turn off the furnace disconnect for at least 5 seconds.
- The control also resets by itself an hour after lockout.
- If it keeps locking out, fix the cause with the 1 flash steps.
- LED flash codes clear when power to the control is cut, including by the door switch, so note the code before opening the door.
- If it relocks repeatedly, stop resetting and have a licensed technician diagnose the gas and ignition system.
If the unit shows an error code, look it up: Goodman Furnace codes
Models
ACES96ACES960403BNAAACES960603BNAAACES960804CNAAACES961005CNAAACES961205DNAAAMES92AMES96AMES920403ANAAAMES920603BNAAAMES920803BNAAAMES920804CNAAAMES920805CNAAAMES921004CNAAAMES921005CNAAAMES921205DNAAAMES960403ANAAAMES960603BNAAAMES960803BNAAAMES960804CNAAAMES960805CNAAAMES961005CNAAAMES961205DNAAGCES96GCES960403BNAAGCES960603BNAAGCES960804CNAAGCES961005CNAAGCES961205DNAAGMES92GMES96GMES920403ANAAGMES920603BNAAGMES920803BNAAGMES920804CNAAGMES920805CNAAGMES921004CNAAGMES921005CNAAGMES921205DNAAGMES960403ANAAGMES960603BNAAGMES960803BNAAGMES960804CNAAGMES960805CNAAGMES961005CNAAGMES961205DNAAVCES96VCES960403BNAAVCES960603BNAAVCES960804CNAAVCES961005CNAAVMES96VMES960403ANAAVMES960603BNAAVMES960803BNAAVMES960804CNAAVMES961005CNAA
Source: Goodman Service and Troubleshooting GMES9*/GCES9*/AMES9*/ACES9*/VMES9*/VCES9* (RS6612016r3) , Heating - Abnormal Operation p.26. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.