Owner`s manual

30
Common faults and troubleshooting
Identify and solve the problem with the help of information below.
Problem solving should be done by a qualified service engineer.
Problem Possible cause Solution
Heat pump
cannot be started
1 Fault in power supply
2 Loose power cable
3 Circuit breaker tripping
1 Switch the unit off and check power supply
2 Check the power cable and its connection
3 Find the reason of tripping and replace the fuse or
switch the circuit breaker on
Operation of
water pump is
noisy and water is
not circulating
1 Lack of water in the system
2 Air in the system
3 Water valves are closed
4 Water filter is dirty and water
flow is blocked
1 Check water quantity and replenish
2 Make venting of water distribution
3 Open water valves
4 Clean water filter
Low capacity of
heat pump,
compressor runs
continuously
1 Lack of refrigerant
2 Wrong insulation of water pipe
3 Low heat exchange ratio on the
air exchange side
4 Insufficient water flow
1 Check there is no refrigerant leak and refill
2 Make a good pipe insulation
3 Clean heat exchanger on the air side
4 Clean water filter
High pumping of
compressor
1 Too much refrigerant
2 Low heat exchange ratio on the
air exchange side
1 Remove some refrigerant
2 Clean heat exchanger on the air side
Low pressure in
the system
1 Lack of refrigerant
2 Clogged filter or capillary
3 Insufficient water flow
1 Check there is no refrigerant leak and refill
2 Replace filter or capillary
3 Clean water filter and make venting of water
distribution
Compressor
is not
running
1 Fault in power supply
2 Faulty compressor contactor
3 Loose power cable
4 Tripping of compressor
protection
5 Wrong setting of return water
temperature
6 Insufficient water flow
1 Check power supply
2 Replace compressor contactor
3 Make cable connection tight
4 Check compressor temperature
5 Make reset of return water temperature
6 Clean water filter and make venting of water
distribution
Compressor too
noisy
1 Liquid refrigerant does not come
into the compressor
2 Faulty compressor
1 Wrong evaporation, find the reason of wrong
evaporation and solve
2 Use a new compressor
Fan is not running 1 Faulty fan relay
2 Faulty fan motor
1 Replace fan relay
2 Replace fan motor
Compressor is
running, but unit
cannot reach
heating or cooling
capacity
1 Lack of refrigerant
2 Faulty heat exchanger
3 Faulty compressor
1 Check there is no refrigerant leak and refill
2 Find the reason and replace the heat exchanger
3 Use a new compressor
Low temperature
of output water
1 Insufficient water flow
2 Low setting of water
temperature demand
1 Clean water filter and make venting of water
distribution
2 Make reset of water temperature demand
Low flow
protection
1 Lack of water in the system
2 Faulty flow switch
1 Clean water filter and make venting of water
distribution
2 Replace flow switch