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A. Form of Troubleshooting
Check whether there is fault on
pressure switch or refrigerant loop
Check whether system compressor
is in normal operation
Protection/fault
Standby
Normal booting
Water inlet temp. sensor error
Ambient temp. sensor error
Antifreezing protection
Water flow protection
Cause
Water inlet temp sensor is in open
circuit or short circuit
Check and replace temp. sensor
Water outlet temp sensor is in
open circuit or short circuit
Ambient temp sensor is in open
circuit or short circuit
Check and replace temp. sensor
Check and replace temp. sensor
Way of troubleshooting
Abnormal communication between
remote controller and mainboard
Flow is inadequate
Check water flow , and whether
water system is damaged
Ambient temperature is too low
Ambient temperature is too low
There is no or little water in water system
Check water flow , and whether
water system is damaged
Fault
display
NO
NO
P01
P02
P04
P07
P08
High-pressure protection
Low-pressure protection
E01
E03
E02
Suction temp. sensor is in open
circuit or short circuit
Check and replace temp. sensor
Exhaust temp. Sensor is in open
circuit or short circuit
Check and replace temp. sensor
High-pressure switch is disconnected
Low-pressure switch is disconnected
E07
E19
E29
Compressor load is too large
Suction pressure sensor is in open
circuit or short circuit
Exhaust pressure sensor is in open
circuit or short circuit
Winter Level I antifreezing
protection
PP2
Input voltage is too low, resulting in
too high input current
Input current is too high, exceeding
effective value for protection current halt
DC bus voltage
＞
DC bus overvoltage
halt protection value
DC bus voltage
＜
DC bus overvoltage
halt protection value
IPM current is too large
Temperature of IPM module is too high
Sensor is in short circuit or open circuit
Temperature of power component is
too high
Fault of current sampling
Compressor current is too high
Input voltage is in default phase
Default phase, step out or hardware
damage on actuator
Fault of DSP and communication board
Fault of DSP and PFC
Fault of current sampling
Chip error
Inadequate magnetic force of compressor
Check and replace exhaust pressure
sensor
Check and replace suction pressure
sensor
Check and measure input voltage
Check and measure input current
Check and measure bus voltage
Check and measure bus voltage
Check and measure current as well
as adjust
Check and measure current as well
as adjust
Check and replace sensor
Reduce temperature and check
c
omponent
Check and measure current as well
as adjust
Check and measure voltage as well
as adjust
Check and measure voltage and
check frequency board hardware
Check communication connection
Check communication connection
Check communication connection
Check and measure current as well
as adjust
P181
E21
E22
E24
E25
E27
E28
E29
E30
E32
E33
E35
E36
Water inlet temp.sensor error
Suction temp. sensor error
Exhaust temp. sensor error
Suction pressure sensor error
Exhaust pressure sensor error
Winter Level II antifreezing
protection
AC input undervoltage
protection
Exhaust over heat
protection
AC input overcurrent
protection halt
DC bus overvoltage
protection
DC bus undervoltage
protection
IPM overcurrent protection
IPM module overheat
protection
Radiator temperature
sensor error
Power component overheat
protection halt
IPM current sampling
Compressor overcurrent
protection hault
Input voltage default phase
Failure of compressor
booting
Fault of communication
between DSP and PFC
Fault of communication
between DSP and
communication board
Input voltage sampling
Fault of EEPROM
Compressor flux weakening
protection alarm
Fault of communication between
actuator and Pc8002
Check whether there is fault on
pressure switch or refrigerant loop
Check whether chip is damaged and
replace chip
PP1
E37
E38
E39
E40
E41
EE8
Form of Troubleshooting
Form of Troubleshooting
B. Or make judgment and troubleshooting by reference to the following form
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.
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