Goodman Gas Furnace: GMNT Re: Lockout Codes # of Flashes Description 1 Ignition failure (3 tries) 2 Pressure switch stuck closed 3 Pressure switch stuck open 4 Limit switch open or Blown low voltage fuse 5 Flame present with gas valve off 6...

Goodman Gas Furnace: GMNT Re: No Heat - Flashing Code 1 Code 1 = Three consecutive failed ignition attempts. ► This is a Soft-Lockout which will automatically reset after 1 hour. Qty Possible Causes: 1 Tripped Roll-Out (Bad Heat Exchanger) Dirty Flame Sensor 2 ...

Goodman Gas Furnace: GMNT Re: Flashing Code 2 Code 2 = Pressure switch stuck closed The furnace pressure switch should only close when the inducer fan output is energized. If control board is not energizing the inducer fan output and the switch is closed, the board will flash a code 2. ► A...

Goodman Gas Furnace: GMNT Re: Flashing Code 3 If, after the vent blower is energized, the pressure switch does not close, the control will keep the blower on and wait for the switch to close. The diagnostic code for this problem is 3 short flashes followed by a pause. ► The diagnostic code will...

Goodman Gas Furnace: GMNT Re: Flashing Code 4 (Assuming original control board) If the limit control opens, the burners will be de-energized and the air circulation and vent blower will be turned on until the limit closes. The diagnostic light code for this is four short flashes followed by...