Climatemaster Geothermal: GSV/GSH
Re: Code 2 / High Pressure Fault (Cooling)
Code 2 = High Pressure Fault
► There may be an optional High Water Temperature Switch (HWTS) or a High Water Pressure Switches (HWPS) wired in series with the refrigerant High Pressure Switch.
► When the high pressure switch circuit opens the compressor relay is de-energized immediately since the high pressure switch is in series with the compressor contactor coil.
| Qty |
Possible Causes: |
|
Refrigerant Over-Charge |
|
Bad Expansion Valve |
| 1 |
Low Water Pressure |
| 1 |
Bad Pump Motor |
|
Bad Pressure Switch |
CHECKOUT:
1. 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).
2. Check Loop Pump(s)
- Set the thermostat to call for cooling.
- If the heat pump is in lockout, reset by removing 24VAC power to the control board or by cycling high voltage power.
- Unit goes into High Pressure lockout immediately or as soon as the compressor tries to start = Open Hi Pressure Switch, Open Water Pressure Switch, or Open Water Temperature Switch.
- Once the compressor starts, check amperage on each pump.
- Each pump should pull around .7 or .8 amps.
- Excess Amperage = Pump Locked-Up
- No Amperage = No Power to Pump or Bad Pump ⇒ Check for 230V power to the pumps.
- Contactor Energized + No Power to Pumps ⇒ Check Pump Circuit Breakers (mini-breakers)
- Re-check the inlet and outlet water pressures.
- Both pressures should be positive.
- Record pressure drop.
- Check and Record the inlet water temperature.
- Determine GPM/Ton based on flow chart.
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 PSIG + High Discharge PSIG + Low Sub-Cooling + High Water Temp Rise = Low Water Flow
- Normal Suction PSIG + High Discharge PSIG + High Sub-Cooling + Normal Water Temp Rise = Refrigerant Over-Charge
- Low Suction PSIG + High or Normal Discharge PSIG + High Sub-Cooling + Low Water Temp Rise = Bad Expansion Valve