Daikin Comfora ATXP20~35L2V1B, Service Manual

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1 Troubleshooting
Service manual
14
ATXP20~3 FTXP20~7 ARXP20~3
RXP20~71L2V1B
Split Comfora R32
ESIE18-01 – 2019.02
1.6 Symptom based troubleshooting
1.6.1 Operation does not start
Check Detail
When the operation lamp is off,
there is a power failure.
Check the power supply.
▪ Is the power supply breaker
ON?
▪ Do other electrical appliances
work?
▪ Is the rated voltage (± 10%)
supplied?
▪ Check the insulation of the
electric system.
Check the type of the indoor unit. Is the indoor unit type compatible
with the outdoor unit?
Check the transmission between
indoor and outdoor. ▪ Connection wires.
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.
When the operation lamp blinks,
there may be an error code,
activating the protection device.
Diagnose with remote controller
indication.
See "1.5 Error based
troubleshooting" on page 4 .
Check the remote controller
addresses. Are the address settings for the
remote controller and indoor unit
correct?
Check the operation circuit. ▪ Is the thermal fuse blown.
▪ Are wire size and wire
connections OK?.
Check fan motor. ▪ Is the magnetic switch
defective?
▪ Is the overcurrent relay
defective?
Check compressor. ▪ Is the contact defective?
▪ Is the protection thermostat
defective?
▪ Is the compressor itself
defective?
Check remote controller. ▪ Are the batteries LOW?
▪ Are there incorrect settings?
1.6.2 Operation sometimes stops
Check Detail
When the operation lamp is off,
there is a power failure.
Check the power supply.
▪ A power failure of 2 to 10
cycles stops air conditioner
operation.
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.
Check Detail
When the operation lamp blinks,
there may be an error code,
activating the protection device.
Diagnose with remote controller
indication.
See "1.5 Error based
troubleshooting" on page 4 .
1.6.3 Operation starts but the unit does not
cool/heat
Check Detail
Check the electrical power
supply. Is the rated voltage (± 10%)
supplied?
Check for piping and wiring
errors in the connection between
the indoor unit and outdoor unit. ▪ Refrigerant piping is too long;
is the length within specified
range?
▪ Field piping is defective; is
there a refrigerant leakage?
▪ Is there capacity loss over the
condensor, saturation pressure
or sound because of air mixed
in to the circuit?
▪ Incorrect size of connection
wiring.
When the operation lamp blinks,
there may be a thermistor
detection error code, activating
the protection device. ▪ Check the resistance of all
thermistors.
▪ Check the connection of all
thermistors.
▪ Is there a malfunction in the
room temperature thermistor
or
outdoor temperature
thermistor?
Check for faulty operation of the
electronic expansion valve. Set the unit to cooling operation,
and check the temperature of the
liquid pipe to see if the electronic
expansion valve works.
Diagnose by service port
pressure and operating current. Check for refrigerant shortage.
Check if the set temperature is
appropriate. thermostat "off" can be activated,
set the appropriate temperature.
Check the type of the indoor and
outdoor units. Is the indoor unit type compatible
with the outdoor unit?
Check the air filter. Is the air filter clean?
Check the installation conditions
(specified in the installation
manual). ▪ Does the installed model has
sufficient capacity?
▪ Is there a short circuit air flow
caused by insufficient
installation space?
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.