York Heat Pump: YHM Re: Fault Codes The fault and status codes for the YHM heat pump are displayed on the small control board mounted beneath the large inverter board. LED Seg 1 Seg 2 Description Solid 0 0 Control Failure Operational Faults Solid 0 1 ...

York Heat Pumps: YHM Re: Reversing Valve not Energizing - Cooling The reversing valve powers through a 2-wire plug on the Heat Pump Control Board. ► There have been reported incidents where the 2-wire plug does not make good contact and causes the unit to run in heating mode when calling for...

York Heat Pump: YHM Re: Flashing Code 8 Fault Code 8 = Inverter Communication Fault The 24V Diagnostic Board communicates with the High Voltage Inverter Board. Qty Possible Cause Action 3 1. No Line Voltage Check the power in and out of the unit-mounted breaker. ...

York Heat Pump: YHM Re: Fault Code 10 The fault and status codes for the YHM heat pump are displayed on the small control board mounted beneath the large inverter board. Fault Code 10 = Outdoor (Ambient) Sensor Failure (Open) Qty Possible Cause Action 1. Loose plug on...

York Heat Pump: YHM Re: Fault Code 47 The fault and status codes for the YHM heat pump are displayed on the small control board mounted beneath the large inverter board. Fault Code 47 = Fan Inverter IPM Fault Qty POSSIBLE CAUSE ACTION 1. Sudden Supply Voltage Change ...

York Heat Pump: YHM Re: Auxiliary Heat Operation When the heat pump receives a call for "W", it will immediately energize "W1 Out". After a 15 minute delay, if "W" is still energized, "W2 Out" is energized.

York Heat Pump: YHM Re: Low Pressure Fault - Heating The YHM heat pump has a 5-stage Mitsubishi compressor a DC Inverter board. A small control board below the Inverter Board has the diagnostic and status indications. A Low Pressure Fault is indicated by the following LED pattern on the outdoor...