Water inlet temp. sensor failure
Check the sensor connection, change the sensor if necessary.
Water outlet temp. sensor failure
Check the sensor connection, change the sensor if necessary.
Coil temp. sensor failure
Check the sensor connection, change the sensor if necessary.
Ambient temp. sensor failure
Check the sensor connection, change the sensor if necessary.
Exhaust temp. sensor failure
Check the sensor connection, change the sensor if necessary.
Excessive low temp. of water
outlet when cooling
No Action Needed, this is a protection feature and unit will
restart when necessary
Excessive temperature difference
of water inlet and water outlet
protection
1. Replace exhaust temperature sensor.
2. Replace PCB control board.
3. HVAC Service Technician must check whether there is a
refrigerant system leak. If refrigerant leak is found, repair the
leak point, vacuum unit, then recharge the refrigerant
according to the type and weight of the refrigerant on the
nameplate.
Winter level 1 frost protection
No User Action Needed, this is a protection function
Winter level 2 frost protection
No User Action Needed, this is a protection function
System high pressure failure
1. Check Water Flow. Clean the Pool filter
2. Check the inlet/outlet water temperature. Ensure heat
exchanger is not clogged.
3. Replace the high-pressure switch.
System low pressure failure
1. Ambient temperature too low; <32f
2. Heat exchanger Dirty/Clogged. Carefully clean the fins.
3. Contact HVAC Service Tech as there might be a refrigerant
circuit blockage or refrigerant leak;
Check that there is Water Flowing through the Heat Pump.
Backwash / Clean Pool Filter
Check water flow switch, change the switch if necessary.
Excessive temperature difference
between water inlet and water
outlet
Check whether the water flow meets the nameplate
requirements. Backwash / Clean Filter
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