Sensor Resistance All of York's sensors are the same resistance - 10K Ohm. Temp Ohms Temp Ohms Temp Ohms Temp Ohms 0 85,371 50 19,896 100 5,827 150 2,041 5 75,230 55 17,434 105 5,208 155 1,854 10 62,499 60 15,310 110 ...

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...

Service Letter: ST-001-16 SUBJECT: LX Series Package Heat Pumps and Split System Heat Pumps Defrost Control Boards The new LX series package and split system heat pumps use a visually identical defrost control board. The purpose of this ST letter is to make the field aware that although...

York Heat Pump Re: 331-01975-102 DEMAND DEFROST CONTROL Issue: Outdoor Unit Won't Come On The Demand-Defrost control has a selectable defrost curve. The original board is programmed at the factory with the correct defrost settings for the unit on which it is installed. The...

Make: York Model or Series: Yorkguard Type: Heat Pump Problem Description: Thermostat red light flashing continuous Observed Symptoms: Rapid red flashing at thermostat Solution: Analyzer plugged-in. Additional Information: On a unit equipped with a Yorkguard IV, plugging-in a...

Yorkguard IV and V Re: Lockout Codes / Fault Codes The Yorkguard IV and V boards both have diagnostic functionality that will energize the X/L terminal to flash a light at the indoor thermostat if abnormal operating conditions occur. Unlike the Yorkguard VI, the number of flashing lights on...

Honeywell Thermostats: VisionPro IAQ Re: Thermostat Shows Error 40 Some heat pumps have a diagnostic board that will flash a light or display "Error 40" at the thermostat when a fault condition occurs. Error Code 40 is displayed on a Honeywell VisionPro IAQ thermostat when it receives a 24V...

Honeywell Thermostats Re: Red Light on Thermostat Flashing Some York Heat Pumps have a diagnostic board that will flash a light or display "Error 40" at the thermostat when a fault condition occurs. The light will flash a certain number of times, pause, then flash the same number again. ...

York Heat Pump Re: Replacement Demand Defrost Control Board - S1-33101975102 INSTALLATION Power off unit totally - 240V & 24V Pull unit disconnect. Disconnect high voltage power to air handler Record positions and colors of original wiring. Remove old defrost control board....

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...