1 | Troubleshooting
Service manual
30
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Split Sensira R32
ESIE18-12E – 2021.02
Check Detail
Check the outdoor temperature. ▪ Heating operation cannot be used
when the outdoor temperature is
18°CWB or higher.
▪ Cooling operation cannot be used
when the outdoor temperature is
below –10°CDB.
When the operation lamp blinks, there
may be an error code, activating the
protection device.
Diagnose with remote controller
indication.
See "1.5Error based
troubleshooting"[47].
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?
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