York YZH Heat Pumps Up to 18 SEER Heat Pump 2-Stage Scroll Compressor on all models No 1/2 ton models (2, 3, 4 & 5 Ton Only) Yorkguard VI Controller R410A Refrigerant Matched with a Variable Speed indoor blower Must have indoor expansion valve Some models use a York Communicating...

Yorkguard VI will energize the X/L terminal to flash a light at the thermostat to notify the homeowner of a problem with the heat pump. Fault Code Memory: The control will store the last 5 error codes. As new error codes are stored, the oldest is deleted. The stored error codes can be...

York Heat Pump: Cooling Re: Hi Pressure Fault + Hi Discharge Temperature Fault When checking the fault history, the Yorkguard VI shows both a High Pressure and High Discharge Temperature fault. A High Pressure Lockout is indicated by the following LED pattern on the outdoor unit control...

York Heat Pump: Yorkguard VI Re: Low Discharge Temperature (Cooling) The status lights on the module will indicate as follows: Red = On, Green = 6 Flash. If, after energizing the compressor contactor for 1 hour, the Yorkguard module senses a compressor discharge temperature lower than 90...

York Heat Pump: Yorkguard VI Re: Low Discharge Temperature (Heating) The status lights on the module will indicate as follows: Red = On, Green = 6 Flash. If, after energizing the compressor contactor for 1 hour, the Yorkguard module senses a compressor discharge temperature lower than 90...

Heat Pump: YorkGuard VI Re: Compressor not Operating These heat pumps are equipped with a YorkGuard VI module which monitors and controls unit operation and defrost. An X/L terminal on the YorkGuard module sends a signal inside to flash a diagnostic light at the thermostat. ► Unlike...

York Heat Pumps: YorkGuard VI Re: Add-On Heat Pump ("Fossil Fuel") Operation When a heat pump equipped with a YorkGuard VI module is installed in an "Add-On" or "Fossil Fuel" application, the YorkGuard handles all of the "Fossil Fuel" sequences with the addition of a "Bonnet Sensor" between...

York Heat Pump: Heating Re: High Pressure Fault - Last Mode Heat Pump The heat pump was running in normal heat mode (not in defrost) and the high pressure switch tripped. A High Pressure Lockout is indicated by the following LED pattern on the outdoor unit control board: Green = Off Red...

Heat Pump: YorkGuard VI Re: Low Pressure Fault - Heating These heat pumps are equipped with a YorkGuard VI module which monitors and controls unit operation and defrost. A Low Pressure Fault is indicated by the following LED pattern on the outdoor unit control board: Green = Off Red = 4...

1. Check Line Voltage Check the inlet line voltage. Acceptable range = 200 - 240VAC