Hp5 System Lockout; Low Pressure Fault - Aquacal TropiCal T035 Operation Manual

HP5 SYSTEM LOCKOUT

ISSUE
The heat pump has locked due to five high-pressure faults during one call for heating or cooling.
RESOLUTION
1. Deactivate then reactivate power to the heat pump to clear error.
2. Troubleshoot the high-pressure issue causing the error.
See "HIGH PRESSURE FAULT" on the previous page.
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LOW PRESSURE FAULT

ISSUE
The refrigerant system's low-pressure switch is showing as open.
RESOLUTION
Heat Only Units
Place heat pump in heating mode and perform the following troubleshooting.
1. Check for proper fan operation. If the fan is not operating, contact AquaCal
2. Check for obstructed airflow around the heat pump.
See "Clearances" on page 25.
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3. Check for a dirty or blocked evaporator coil.
See "Cleaning Equipment" on page 24.
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4. Check for signs of heavy ice buildup on the coil.
Cool Only Units
Place heat pump in heating mode and perform the following troubleshooting.
Determine if an insufficient amount of water is being supplied to the equipment.
1. Confirm the filter pump is on.
2. If a multiple-speed filter pump is being used, run filter pump at a higher speed. Do not exceed the
maximum flow rate for the model.
3. Confirm water is not being diverted away from the heat pump.
See "Water Flow Rates" on page 26.
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See "Adjusting Water Flow Using ΔT (Delta-T)" on page 27.
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Heat and Cool Units (Reversing)
Place heat pump in heating mode and perform the following troubleshooting.
1. Check for proper fan operation. If the fan is not operating, contact AquaCal
2. Check for obstructed airflow around the heat pump.
See "Clearances" on page 25.
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3. Check for a dirty or blocked evaporator coil.
See "Cleaning Equipment" on page 24.
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4. Check for signs of heavy ice buildup on the coil.
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