Troubleshooting Using Displayed Codes - Aquacal Heat Pump Installation Manual

Controls Configuration & Adjustments...
The HP7R heat pump microprocessor controller is designed to be self-diagnostic through the display
of various fault codes.
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 if any
code is being displayed. Having this information at hand will permit the Service Representative to work
through–with you–any site related issues causing or contributing to the problem. Then, if after working
through site-related issues the heater is still not functioning correctly, the Service Representative will
offer to set up a service visit. As necessary, please Contact AquaCal Customer Support Group (727-
823-5642).
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 (727-823-5642).
WARNING !
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 (727) 823-5642
Message
[dPO]
[PO] Water Temperature Sensor Open
[dPC] Defrost Sensor Shorted
[PC] Water Temperature Sensor Shorted
[LP] Refrigerant System Low
[HP] Refrigerant System High Pressure
[HP5] 5 High Pressure Faults Within One (1)
Call for Heating or Cooling (Lock Out
[LP5] 5 Low Pressure Faults Within One (1)
Cooling (Lock Out Condition)
[OTA] Over Temperature Alarm <
Temperature over 110 F (Unit
[FLO]
[FS] Heater in Defrost Mode
[CSE]
[CEr]
52

Troubleshooting Using Displayed Codes

Interpreting Error Codes
Error Description
Defrost Sensor Open
Pressure Switch Open
Switch Open
Condition)
Call for Heating or
Locked)
Low or No Water Flow
Detected
(Heat-Only Units)
Control System Error
Communication Fault
Failure to heed the following may result in permanent
injury or death.
Possible Cause
Cut or loose defrost sensor wiring.
Cut or loose temperature sensor wiring.
Short circuit in defrost sensor wiriting or defective defrost sensor.
Short circuit in water temperature sensor or defective sensor.
System refrigerant charge low, defective low pressure switch, clogged
evaporator coil, or defective wiring.
Low water flow, defective high pressure switch, or defective wiring.
See causes for [HP]
See causes for [LP]
Defective compressor contactor, defective controller, or defective water
temperature sensor.
Circulating pump off, water filter dirty, isolation valves set impropery,
or defective pressure switch.
Normal function in lower air temperatures. Fan continues to run and compressor
is off. Compressor will restart when air-coil temperature reaches 38 F or above.
Controller may need to be reset. Disconnect then reconnect power to controller.
If error continues, replace control board, display board, or both.
Loss of communication between main board and display board. Reset controller
or replace communication cable.