Chigo CMV-50V9A-S, Service Manual

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The
fault
code
The fault content
The reason of fault and solution
P1
Indoor coil
temperature
over-temperature
protection for heating
(thermal overload),
outdoor coil
temperature
overheating protection
for cooling (cooling
overload)
1、
Check whether the ambient temperature is over the range
of air-conditioning running temperature ;
2、
Check whether the indoor coil temperature is higher than
or equal to 63 degrees when heating and check whether
the outdoor coil temperature is higher than or equal to 65
degrees when cooling, it will appear protection if the
value is over the above;
3、
Check whether the parameters of indoor and outdoor coil
temperature sensors are normal, if abnormal, please
replace the sensors;
4、
If the above are normal, check whether the main control
board output parameters are normal, if abnormal, please
replace the main control board.
P2
The outdoor unit
inverter module
protection fault
1、
Check whether the connection of the compressor is reliable,
otherwise connect firmly again;
2、
Check whether the fixation between the IPM module and
the radiator is firm.
;
3、
Check whether the compressor is well, otherwise replace it;
4、
Check whether the IPM module is abnormal, otherwise
replace it.
P3
Over current of
outdoor unit
1 、
Check whether the ambient temperature exceeds the
operation range for the air conditioner
;
2、
Check whether the current detection circuit is abnormal, the
electric control should be replaced when it is abnormal.
.
P4
discharge temperature of
compressor is too high, the
outside
ambient
temperature
over-temperature,
switch
off the compressor shell
temperature,
module
temperature
over-temperature
1
、
Check whether the pressure is normal when the unit is
running, if it is abnormal, you should detect the leakage and
then welding and adding refrigerant;
2
、
Check whether the ambient temperature is too high or too
low, when the temperature is more than -20 degrees and less
55 degrees, it can disappear automatically;
3
、
Check whether temperature switch of compressor is
damage, it should be replaced if it is damaged.
P7
The outdoor unit DC
generatrix voltage is
abnormal
1、
Check whether the supply voltage is out of ranging from
150 to 270V
;
2、
Check the voltage detection circuit of the IPM base board is
abnormal, if it is abnormal, the IPM base board or the electric
control board should be replaced.
P8
lack refrigerant or reverse
valve fault
1
、
Check whether the high and low pressure valves have been
opened, otherwise open the valves;
2
、
Check whether the indoor coil pipe temperature sensor is
normal, if it is abnormal, the sensor should be replaced;
3
、
Check whether the indoor coil temperature sensor hung in
the air
，
please plug it in a correct position if the indoor coil
temperature sensor hung in the air;
4
、
Check the system pressure is abnormal, if it is abnormal,
yon should detect leakage and the welding and adding the
refrigerant.;
5
、
Please change the outdoor PCB board , if all above are
normal.
PA
protection when indoor
pipe temperature is too
low (Anti-icing)
1、
Check whether the ambient temperature is over the range
of air-conditioning running temperature;
2、
Check the indoor coil temperature is less than or equal to
-1 degrees, if more than this value it will be the protection
of;
3、
Check whether the indoor coil temperature sensor
parameters are normal, if abnormal it is the replacement
of the sensor;
4、
If the above are normal, check whether the main control