Operation Starts But The Unit Does Not Cool/Heat - Daikin Perfera RXM R Series Service Manual

2 | Troubleshooting

2.6.3 Operation starts but the unit does not cool/heat

Service manual
34
Check
Check the outdoor temperature.
When the operation lamp blinks, there
may be an error code, activating the
protection device.
Diagnose with remote controller
indication.
Check
Check the electrical power supply.
Check for piping and wiring errors in the
connection between the indoor unit
and outdoor unit.
When the operation lamp blinks, there
may be a thermistor detection error
code, activating the protection device.
Check for faulty operation of the
electronic expansion valve.
Diagnose by service port pressure and
operating current.
Check if the set temperature is
appropriate.
Check the type of the indoor and
outdoor units.
Check the air filter.
Detail
▪ 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.
See "2.5 Error based
4
troubleshooting" [ 9].
Detail
Is the rated voltage (± 10%) supplied?
▪ 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.
▪ Check the resistance
thermistors.
▪ Check the connection
thermistors.
▪ Is there a malfunction in the room
temperature thermistor or outdoor
temperature thermistor?
Set the unit to cooling operation, and
check the temperature of the liquid
pipe to see if the electronic expansion
valve works.
Check for refrigerant shortage.
thermostat "off" can be activated, set
the appropriate temperature.
Is the indoor unit type compatible with
the outdoor unit?
Is the air filter clean?
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
of all
of all
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01