1 Troubleshooting
Service manual
16
ATXP20~3 FTXP20~7 ARXP20~3
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
Check item
Detail
Is there clogging before or after
the expansion valve (capillary)?
▪ Check if there is a temperature
difference before and after
expansion valve (capillary).
▪ Check if the main valve unit of
expansion valve operates (by
noise, vibration).
Is the check valve clogged?
after check valve. If YES, the
check valve is caught.
Is the refrigerant gas short?
Conduct refrigerant collection
and vacuum drying, and then
add proper amount refrigerant.
1.6.7
Indoor fan starts operating but the
compressor does not operate
Check
Detail
Check the power supply.
▪ Is the rated voltage (± 10%)
supplied?
▪ Check the insulation of the
electric system.
Check the thermistor.
▪ Connection witch PCB.
▪ Output.
Check PCB's.
▪ if green led on the control PCB
is not blinking, then the
microprocessor is not working.
▪ if the green led on the main
PCB is not blinking, then the
microprocessor is not working.
▪ if first green LED on the
service monitor PCB is not
blinking,
then
the
microprocessor is not working.
Check the magnetic switch.
Check the power transistor.
Check the compressor.
▪ Defective contact.
▪ Defective compressor.
▪ Defective
protection
thermostat.
Check the outdoor temperature.
▪ Heating operation cannot be
used
when
the
outdoor
temperature is 18°C WB or
higher.
▪ Cooling operation cannot be
used
when
the
outdoor
temperature
is
below
–
10°C DB.
1.6.8
Operation starts and the unit stops
immediately
Check
Detail
Check the power supply.
▪ Is the capacity of the safety
breaker as specified?
▪ If the earth leakage breaker is
too sensitive, then increase the
set value of the earth leakage
current of the breaker or
replace the breaker.
▪ Is the circuit exclusive?
▪ Is the rated voltage (± 10%)
supplied?
▪ Is there an incorrect size of
connection wiring?
Check the refrigerant charge.
▪ Overcharge.
▪ Air in the system.
▪ Water in the system.
Check the fan motor.
▪ Check the magnetic switch.
▪ Check the overcurrent relay.
Check the four way valve coil.
▪ Is there a short circuit?
▪ Is the four way valve coil
broken?
Check the outdoor PCB.
▪ Is there a short circuit?
▪ Is the outdoor PCB broken?
Check the heat exchanger.
Soiled heat exchanger,
obstruction.
Check the airflow.
Soiled air filter, obstruction,
installation space.
1.6.9
Operation stops, unit cannot start for a
while
Check
Detail
Check if standby function is
activated.
▪ Compressor delay timer is
counting.
▪ Wait for minimum 3 minutes.
Check the power supply.
▪ Low voltage?
▪ Is the size of the power cable
sufficient?
Check the refrigerant charge.
▪ Incorrect charge.
▪ Air in the system.
▪ Water in the system.
▪ Obstruction in the system.
Check compressor.
▪ Overcurrent relay.
▪ Protection thermostat.
1.6.10
Unit discharges white mist
Check
Detail
Check installation conditions.
▪ Humid site.
▪ Dirty site.
▪ Oil mist.
Check installation conditions.
Dirty heat exchanger.
Air filter.
Dirty air filter.
Fan motor.
Defective fan motor.
