Climatemaster - Code 2 / High Pressure Fault - Cooling

Climatemaster Geothermal: TE

Re: Code 2 / High Pressure Fault - Cooling

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 coil.

CHECKOUT:

1. Check Pump Configuration

• Hook-up a Climatemaster communicating thermostat or service tool to the control board.
• Enter Service Mode by pressing and holding the Up and Down buttons until the display changes.
• Go to Pump Configuration and change the pump control from "Delta T" to "Fixed".
• Adjust the "Fixed" speeds to 75% for 1st Stage & 90% for 2nd Stage.

2. Check Water Pressure

• With the unit off, check the inlet and outlet water pressure (psig).
  • Both pressures should be the same and both should be positive pressure (at least 5psig).

3. Check Refrigerant Pressure

• Hook-up refrigerant gauges to the pressure ports on the unit.
  • Blue --> Low Pressure
  • Red --> High Pressure
• Place an insulated temperature probe on the liquid line between the heat exchanger and expansion valve.
• Ensure that the heat pump is running at full capacity.
• Allow the unit to run for at least 5 minutes.
• Record pressures and temperature as the system operates.
• Record Sub-Cooling
  • Sub-Cooling = Saturation Temp (from gauge) - Liquid Line Temp
• Check and Record water temperature rise.
• Refer to Performance Chart for normal operating conditions.
  • High Suction + High Discharge + Low Sub-Cooling + High Water Temp Rise = Low Water Flow
  • Normal Suction + High Discharge + High Sub-Cooling + Normal Water Temp Rise = Refrigerant Over-Charge
  • Low Suction + High Discharge + High Sub-Cooling + Low Water Temp Rise = Bad Expansion Valve