Goodman Gas Furnace: GMS8/GMS9 OR GCS8/GCS9 Re: Lockout Codes # of Flashes Description Off No Power or Faulty Control On Normal Operation 1 Ignition lockout (3 failed tries) - 1hr Auto Reset 2 Pressure switch stuck closed 3 Pressure switch stuck...

Goodman Gas Furnace: GMS9/GMD9/GMH9 Re: Code 1 / Won't Ignite Code 1 = 3 Failed Ignition Attempts ► Be aware that the furnace Condensate Pressure Switch breaks power to the gas valve and will cause a Fault Code 1 (Does not cause a Code 3). Qty Possible Causes: Dirty Flame...

Goodman Gas Furnace: GMS9/GCS9 Re: Flashing Code 4 (Assuming original control board) Code 4 = Limit Circuit Open If the Limit Circuit opens, the burners will be de-energized and the air circulation and vent blower will be turned on until the Limit Circuit closes. The diagnostic light code...