P3DH Lockout Codes
York Gas Furnace: P3DH/P3DN Re: Lockout Codes Red Light Status Description On Faulty Control Rapid Flash Low Flame Sense Signal 1 Lockout Caused by Flame Sensed 2 Pressure Switch Stuck Closed 3 Pressure Switch Stuck Open 4 High Limit or...
11 Jan, 2019
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P3DH - Flashing Code 3
York Gas Furnace: TM9X/TM9E Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. This gas furnace has two pressure switches (1LP & 2LP) - a higher pressure switch to monitor the negative pressure at the inducer motor, and a lower pressure switch to...
10 Dec, 2024
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P3DH - Flashing Code 4
York Gas Furnace: P3DH Re: Flashing Code 4 CODE 4 = High Limit or Blower Limit Open There are three limits on this furnace: Primary Limit Auxiliary Limit Blower Limit If any of the three limit controls open, the burners will be de-energized and the air circulation and vent blower will be...
11 Feb, 2019
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P3DH - Flashing Code 5
York Gas Furnace: P3DH Re: Flashing Code 5 Flashing Code 5 = Rollout Switch Open Other symptoms associated with a Code 5: Blower and Inducer Running Continuous No Heat Qty Possible Causes: 1 Rollout Switch Tripped Bad Control Board CHECKOUT: 1. Check...
24 Mar, 2018
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