evoheat Evo Control 17, Installation & Operation Manual, Page: 16 / 24

15 Evo Control 17 & 25 Manual
6.3 System Failures (Both Models)
FAILURE POSSIBLE CAUSES 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 correct the connection
Circuit breaker open
Check for the cause and replace the fuse or circuit
breaker
Water pump is running
with high
Noise or without water
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 water loop
Dirt and block 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 does not run
Power supply failure Check off the power supply
Compressor contactor broken Replace compressor contactor
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 get rid of it
Compressor failure Use new compressor
Fan does 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