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...

Climatemaster Geothermal: TT/TS Re: Code 2 / High Pressure Fault - Cooling Code 2 = High Pressure Fault ► There may be (2) Water Pressure Switches wired in series with the refrigerant High Pressure Switch. ► When the high pressure switch opens due to high refrigerant pressures the...

Climatemaster Geothermal: Heating Re: Code 2 / High Pressure Fault Code 2 = High Pressure Fault When the high pressure switch opens due to high refrigerant pressures the compressor relay is de-energized immediately since the high pressure switch is in series with the compressor contactor...

Climatemaster Geothermal: Heating / Cooling Re: Code 3 / Loss of Charge Code 3 = Low Pressure Fault The low pressure switch must be open and remain open for 30 continuous seconds during an “on” cycle to be recognized as a low pressure fault. If the low pressure switch is open for 30...

ClimateMaster Heat Pump: Heating Re: Code 4 / LT1 Fault Code 4 = Low Water Coil Temperature (FP1 or LT1) The LT1 thermistor temperature must be below the selected low temperature limit setting* for 30 continuous seconds during a compressor run cycle to be recognized as a LT1 fault. ...

ClimateMaster Heat Pump: Cooling Re: Code 5 / LT2 Fault Code 5 = Low Air Coil Temperature (FP2) The FP2 thermistor temperature must be below the selected low temperature limit setting (30 deg. unclipped) for 30 continuous seconds during a compressor run cycle to be recognized as a FP2...

ClimateMaster Heat Pump: Heating / Cooling Re: Code 6 Code 6 = Condensate Overflow The condensate overflow sensor must sense overflow level for 30 continuous seconds to be recognized as a CO fault. Condensate overflow will be monitored at all times. Qty Possible Causes: ...

ClimateMaster Heat Pump: Heating / Cooling Re: Code 7 Code 7 = Under or Over Voltage An over/under voltage condition exists when the control voltage is outside the range of 18VAC to 31.5VAC. Over/under voltage shut down is a self-resetting safety. If the voltage comes back within range for...

CLIMATEMASTER GEOTHERMAL Re: Code 8 Code 8 = Unit Performance Sentinel (UPS) Warning The UPS warning is NOT a Lockout condition. The UPS feature is intended to indicate when the heat pump is operating inefficiently. A UPS condition exists when: In heating mode with compressor...

CLIMATEMASTER GEOTHERMAL Re: Code 9 Code 9 = FP1 & FP2 Switched During test mode, the control monitors to see if the FP1 and FP2 thermistors are in the appropriate places. If the control is in test mode, the control will lockout, with code 9, after 30 seconds if: a) The compressor...