Geothermal Heat Pump: Climatemaster Re: Diagnostic Codes CXM Board - Most older Climatemaster Geothermal heat pumps use the CXM Control Board. The CXM board has a diagnostic function that will cause the unit to go into a "lockout" if an abnormal operating condition occurs. When the CXM...

York Gas Furnaces Re: Lockout Codes Most York gas furnaces have a control board inside the furnace blower compartment that will flash a diagnostic code that shows the operating status of the furnace. Diagnostic Codes: Slow Green Normal Operation - no call for heat Slow...

Fujitsu Mini-Split Re: Error A1 Error Code A1 = High Compressor Discharge Temperature Also indicated on the control board by 10 Green flashes and 1 Orange flash. Qty Possible Causes: 3 Low Refrigerant Charge Bad Sensor CHECKOUT: 1. Check Unit...

Geothermal Heat Pump: Waterfurnace Re: Diagnostic Codes These units can have either an Aurora Base Control (ABC) or an Aurora Expansion Board (AXB). The ABC board has a diagnostic function that will cause the unit to go into a "lockout" if an abnormal operating condition occurs. When the...

Honeywell Thermostat: TH4110U T4 Pro Re: Installer Setup Options To enter Installer Setup: Press and hold the "Center" button and the "+" button together for 3 seconds. Press "Select" to enter Setup. Press "Select" to cycle through setup options. Press "+" or "-" to change values. Press...

York 90% Gas Furnace: P3UR Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. Qty Possible Causes: 2 Bad Inducer Motor 1 Bad Pressure Switch 1 Clogged / Frozen Drain 1 Pressure Hose Problem 2 Item Stuck in...

Rheem Gas Furnace: R95PA Re: Flashing Code 57 Code 57 = Furnace Pressure Switch Open when it should be Closed. Qty Possible Causes: Bad Inducer Motor Water in inducer 1 Clogged or Restricted Vent Bad Pressure Switch Clogged / Frozen Drain...

Rheem Gas Furnace: R95PA Re: Status & Fault Codes The furnace control comes standard with a 7-segment diagnostic display. During Standby mode (with no faults), the display will read "0". During normal Heating, Cooling or Continuous Fan operation, a letter will be displayed to...

York 90% Gas Furnace: TG9S Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. ►The code description on the blower door says, "Vent or Termination Problem" which is a possible cause, but not the most likely. This gas furnace has two pressure switches: ...

York Gas Furnace: TM9T/TM9Y Re: No Heat - Flashing Code 8 Code 8 = Flame was established but later lost - 5 times. ► This is a Soft-Lockout which will automatically reset after 1 hour. Qty Possible Causes: 4 Dirty Flame Sensor 2 Water in Inducer Clogged Burners...