28 | Troubleshooting EP Series
EP Series
8733953041 (2019/01)
Subject to change without prior notice
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HRP Troubleshooting
Problem Possible Cause Checks and Corrections
NO FLOW
LOW FLOW
No Power Check power supply
On/Off Switch Position Set switch to “ON” position
Compressor Contactor Engage heat pump contactor
Broken or loose wires Repair or tighten wires
Air Lock Purge air from piping system
Stuck pump shaft/impeller Remove pump cartridge and clean
Defective pump Replace pump
Kinked or under sized water piping Repair kink and check for proper line size
HIGH WATER
TEMPERATURE
Water temp limit closed Stuck limit switch
Sensor not attached securely to line
LOW HEAT OUTPUT Scaled or fouled heat exchanger Clean heat exchanger
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