GSV/GSH - Flashing Code 2 (Cooling)

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.

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.
  • Ideal Flow = 3GPM/Ton

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