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: GMS8/GDS8/GHS8 Re: Short-Cycling / Won't Ignite - No Codes The furnace starts an ignition sequence, then shuts-off and re-starts at the point of ignition. Qty Possible Causes: 2 Shorted Gas Valve Bad Ignition Control Board CHECKOUT: 1....

Goodman Gas Furnace: GMS8/GDS8/GHS8 Re: Code 1 / Won't Ignite Code 1 = 3 Failed Ignition Attempts Qty Possible Causes: Dirty Flame Sensor 2 Bad Ignitor 1 Bad Control Board Tripped Auxiliary Limit Bad Gas Valve CHECKOUT: 1. Check...

Goodman Gas Furnace: GMS8/GMD8/GMH8 Re: Flashing Code 4 If the limit control opens, the burners will be de-energized and the air circulation and vent blower will be powered until the limit closes. The diagnostic light code for this is four short flashes followed by a pause. ► The...