5.2 Common observation
Failure Possible causes for the failure Solutions
Heat pump
cannot
be started
1 Wrong power supply
2 power supply cable loose
3 circuit breaker open
1 shut off the power and check power supply;
2 check power cable and make right connection
3 check for the cause and replace the fuse or
circuit breaker
Water pump is
running with
high noise or
without water
1 lack of water in the piping
2 much air in the water loop
3 water vavles closed
4 dirt and block on the water filter
1 check the water supply and charge water
to the piping;
2 discharge the air in the water loop;
3 open the valves in water loop;
4 clean the water filter.
Heat pump
capacity is low,
compressor
do not stop
1 lack of refrigerant;
2 bad insulation on water pipe;
3 low heat exchange rate on air side
exchanger;
4 lack of water flow
1 check for the gas leakage and recharge the
refrigerant;
2 make good insulation on water pipe;
3 clean the air side heat exchanger;
4 clean the water filter
High compressor
exhaust
1 too much refrigerant
2 low heat exchange rate on air side
exchanger
1 discharge the redundant gas
2 clean the air side heat exchanger
Low pressure
problem
of the system
1 lack of gas
2 block on filter or capillary
3 lack of water flow
1 check the gas leakage and recharge freon;
2 replace filter or capillary;
3 clean the water filter and discharge the air in
water loop.
Compressor
do not run
1 power supply failure
2 compressor contactor broken
3 power cable loose
4 protection on compressor
5 wrong setting on return water temp.
6 lack of water flow
1 check off the power supply;
2 replace compressor contactor;
3 tighten the power cable;
4 check the compressor exhaust temp.;
5 reset the return water temp.;
6 clean the water filter and discharge the air in
water loop.
High noise of
compressor
1 liquid refrigerant goes into
compressor
2 compressor failure
1 bad evaporation, check the cause for bad
evaporation and get rid of this;
2 use new compressor;
Fan do not run 1 failure on fan relay
2 fan motor broken
1 replace the fan relay;
2 replace fan motor.
The compressor
runs but heat
pump has not
heating or
cooling capacity
1 no gas in the heat pump;
2 heat exchanger broken;
3 compressor failure.
1 check system leakage and recharge
refrigerant;
2 find out the cause and replace the heat
exchanger;
3 replace compressor.
Low outlet water
temperature
1 low water flow rate;
2 low setting for the desired
water temp.;
1 clean the water filter and discharge the
air in water loop.
2 reset the desired water temperature.
Low water flow
protection
1 lack of water in the system;
2 failure on flow switch
1 clean the water filter and discharge the
air in water loop.
2 replace the flow switch.
Look over and clear the failure according to below information.
12
5.Maintenance and Inspection
11
5.Maintenance and Inspection
5.1 Ordinary Malfunctions And Solution
malfunction display
Water inlet temp.
Sensor failure
Evaporator sensor
failure
Anti freezing
under cooling mode
E1
E2
E3
tC1
Reason
The sensor is open
or short circuit Check or change the sensor
resolution
Water flow rate
is not enough
Water outlet temp.
Sensor failure
The sensor is open
or short circuit Check or change the sensor
The sensor is open
or short circuit Check or change the sensor
Check the water flow volume,
or water system is jammed or not
High pressure
protect Check through each pressure switch
and return circuit
High pressure
switch action
Normal working
Flow switch failure No water/little water
in water system. Check the water flow volume,
water pump is failure or not
Low pressure
protect Low pressure
switch action Check through each pressure switch
and return circuit
Exhaust temperature/
or current protect
HP1
LP1
FL
A1
Exhaust temperature
or current is too high Check through exhaust temp. switch
and current
Ambient sensor
failure E4 The sensor is open
or short circuit Check or change the sensor
4.3.Parameters Table
Code Meaning Default value Unit
R01 27 ℃
Cooling temperature
Cooling temperature difference
Heating temperature
Heating temperature difference
R02
R03
R04
2
27
2
℃
℃
℃
4.2.4 Malfunction
When there is something wrong with the unit, the wire controller will display the error code
according to the fault reason.
For the detailed meanings of the error codes please refer to the Fault Table.
For example:
Water inlet fault
CAREDL μ
C DIN
2
Prg mute
Sel
clear