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...

Trane Air Handler: GAM5 Re: Status Codes / Error Codes / Fault Codes EVC STATUS LED Flash Description 1 Cool Mode - No Active Call 3 Cool Mode - Active Call for Cooling or Defrost 4 Heat Mode or Off - No Active Call 6 Heat Mode - Active Call for...

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...

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: ...

Lennox Gas Furnace: G24M3 Re: Diagnostic Codes / Lockout Codes There are 2 possible control boards on this furnace - a dual light board (Red & Green) and a single LED board. ORIGINAL BOARD Single-Light Furnace Control Board Fault Conditions LED Description ...

York Gas Furnace: TM9T Re: No Heat - Flashing Code 7 Code 7 = Indicates that the flame could not be established. This no-light condition occurred 3 times (2 retries) during the call for heat before locking out. ► The furnace will lock out for one hour and then attempt a restart. ...

York Air Handler: MP, MX, MV, AHP, AHX, AVY Re: Fan Runs Continuous, Flashing Code 4 Code 4 = Extended Limit Trip The control board in the air handler monitors the limit switch(es) in the aux heaters. If the limit switch opens for a long duration (fault code 4), the control will energize...