Controls Configuration & Adjustments...
Troubleshooting Using Displayed Codes
Interpreting Error Codes
The HP7R heat pump microprocessor controller is designed to be
Owners & Operators: If you believe you are experiencing a problem with the heater, and feel a need to call the factory for assistance, it will be beneficial to let the factory Service Representative know which code is being displayed. Having this information at hand will permit the Service Representative to work
Dealers and Service Centers: For troubleshooting use, listed below are all possible fault messages output by the microprocessor, what the codes mean, and possible causes with solutions for the indicated problem. Please contact AquaCal Technical Support Group, as necessary
WARNING !
Failure to heed the following may result in permanent injury or death.
Heat pumps contain no owner or operator repairable components. Repairs must not be attempted by untrained and/or unqualified individuals. If service is deemed necessary, contact installing dealer or AquaCal Customer Support at (800)
Message | Error Description | Possible cause | |
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[dPO] | Defrost Sensor Open | Cut or loose sensor wiring | |
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[PO] | Water Temperature | Cut or loose sensor wiring | |
Sensor Open | |||
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[dPC] | Defrost Sensor Shorted | Short circuit in defrost sensor wiring or defective sensor. | |
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[PC] | Water Temperature | Short circuit in water temperature sensor or defective sensor. | |
Sensor Shorted | |||
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[LP] | Refrigerant System Low | System refrigerant charge low, defective low pressure switch, clogged | |
Pressure Switch Open | evaporator coil, or defective wiring. | ||
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[HP] | Refrigerant System High | Low water flow, defective high pressure switch, or defective wiring. | |
Pressure Switch Open | |||
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[HP5] | 5 High Pressure Faults | See causes for [HP] | |
Within One Hour (Unit | |||
| Locked) |
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[LP5] | 5 Low Pressure Faults | See causes for [LP] | |
Within One Hour (Unit | |||
| Locked) |
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| Over Temperature Alarm< | Defective compressor contactor, defective controller, or defective water | |
[OTA] | Temperature over 110oF | ||
| (Unit Locked) | temperature sensor | |
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[FLO] | Low or No Water Flow | Circulating pump off or filter dirty, isolation valves set improperly, | |
Detected | defective or improperly set heater water pressure switch | ||
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[FS] | Heater in Defrost Mode | Normal function in lower air temperatures. Fan continues to run and | |
compressor is off. Compressor will restart when | |||
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| reaches 38oF or above. | |
[CSE] | Control System Error | Controller may need to be reset. Disconnect then reconnect power to | |
controller. If error continues replace control board, display board, or both. | |||
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