Aquacal Heatwave Superquiet TropiCal Installation Manual page 36

HP5 Indicator
ISSUE
The heat pump has locked due to five HP (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 "HP Indicator" on page 32.
LP Indicator
ISSUE
The refrigerant system's low-pressure switch is showing as open.
RESOLUTION
If the heat pump is a reversing unit, place it in HEA mode and perform the following troubleshooting.
1. Check for proper fan operation. If fan is not operating, contact AquaCal
2. Check for obstructed air flow around the heat pump. See "Clearances" on page 4.
3. Check for dirty or blocked evaporator coil. See "Cleaning Equipment After Installation" on page 24.
4. Check for signs of heavy ice buildup on the coil.
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 maximum flow rate
for the model.
3. Confirm water is not being diverted away from the heat pump.
See "Water Flow Rates" on page 9.
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See "Adjusting Water Flow Using ΔT (Delta-T)" on page 10.
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4. The water pressure switch may be incorrectly calibrated. See "Adjusting Water Pressure Switch" on page 11.
LP5 Indicator
ISSUE
The heat pump has locked due to five LP (low-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 low-pressure issue causing the error. See "LP Indicator" on page 33.
OtA Indicator
ISSUE
Incoming water temperature exceeded 110° F and the unit is locked with an OtA over temperature alarm. The
heat pump will not operate until incoming water temperature drops to 100° F or lower.
RESOLUTION
1. Determine if another heat source (gas heater, solar heater, etc.) is heating water being sent directly to the heat
pump with the OtA indicator. This situation will need to be corrected before continuing.
2. Rule out an incorrect reading from the water temperature sensor. Verify existing water temperature with an
accurate thermometer. If heat pump's sensor is inaccurate, the water temperature sensor may require replacement.
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