15
Evo Flex Manual
6.3 Troubleshooting Table
Failure
Possible Causes for the Failure
Solutions
Heat pump cannot be
started
Wrong power supply
Shut off the power and check power supply
Power supply cable loose
Check power cable and make right
connection
Circuit breaker open
Check for the cause and replace the fuse or
circuit breaker
Water pump is running
with high noise or without
heater
Lack of water in the piping
Check the water supply and charge water to
the piping
Too much air in the water loop
Discharge the air in the water loop
Water valves closed
Open the valves in the water loop
Dirt and blockage on the water filter
Clean the water filter
Heat pump capacity is low,
compressor does not stop
Lack of refrigerant
Check for the gas leakage and recharge the
refrigerant
Bad insulation on water pipe
Make good insulation on water pipe
Low heat exchange rate on air side
exchanger
Clean the air side heat exchanger
Lack of water flow
Clean the water filter
High compressor exhaust
Too much refrigerant
Discharge the redundant gas
Low heat exchange rate on air side
exchanger
Clean the air side heat exchanger
Low pressure problem of
the system
Lack of gas
Check the gas leakage and recharge freon
Block on filter or capillary
Replace filter or capillary
Lack of water flow
Clean the water filter and discharge the air in
water loop
Compressor do not run
Power supply failure
Check off the power supply
Compressor contactor broken
Replace compressor contractor
Power cable loose
Tighten the power cable
Protection on compressor
Check the compressor exhaust temp
Wrong setting on return water temp
Reset the return water temp
Lack of water flow
Clean the water filter and discharge the air in
water loop
High noise of compressor
Liquid refrigerant goes into compressor
Bad evaporation, check the cause for bad
evaporation and fix
Compressor failure
Use new compressor
Fan do not run
Failure on fan relay
Replace the fan relay
Fan motor broken
Replace fan motor
The compressor runs but
heat pump has no heating
or cooling capacity
No gas in the heat pump
Check system leakage and recharge
refrigerant
Heat exchanger broken
Find out the cause and replace the heat
exchanger
Compressor failure
Replace compressor
Low outlet water
temperature
Low water flow rate
Clean the water filter and discharge the air in
water loop
Low setting for the desired water temp
Reset the desired water temperature
Low water flow protection Lack of water in the system
Clean the water filter and discharge the air in
water loop
Failure on flow switch
Replace the flow switch
