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...

Goodman Gas Furnace: GMES96 Re: Lockout Codes # of Flashes Description Off No Power or Faulty Control On Normal Operation 1 Ignition lockout (3 failed tries) - 1hr Auto Reset 2 Pressure switch stuck closed 3 Pressure switch stuck open 4 ...

Trane Rooftop Heat Pump: WSH Re: Not Defrosting / Frozen This model uses a Reliatel RTRM module to control defrost. The board uses an Ambient (outdoor) Sensor and Liquid Line Sensor to determine the proper conditions for defrost to occur. Qty Possible Causes: 1 Bad Liquid Line...

York package Unit: PCG4 Re: Flashing Code 1 Code 1 = Flame sensed with no call for heat. In a Code 1 situation, the furnace control board thinks that the gas valve is stuck on and the flame is still burning without a call for heat. Therefore, when a control board goes into a code 1, it will...

York Package Unit: PG3 Re: Status Codes / Diagnostic Codes These York package units have a control board inside the unit control compartment that will flash a diagnostic code that shows the operating status of the unit. Status/Diagnostic Codes Status LED A2L LED Condition ...

York Gas Furnace: PT9 Re: Flashing Code 9 Code 9 = Indicates reversed line voltage polarity, reversed low voltage wiring, or Grounding problem Qty Possible Causes: 1 Loose Ground Missing Ground Reversed Line Voltage ("Hot" on white) Reversed Low...