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.
| Qty |
Possible Causes: |
| 3 |
Pump Configuration |
|
Refrigerant Over-Charge |
|
Bad Expansion Valve |
| 2 |
Low Water Pressure |
| 1 |
Low Water Flow |
|
Bad Pressure Switch |
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