ENGLISH
Code
number
Category
Abnormality
Cause
01
Indoor unit
Activation of the safety device
Failure of fan motor, drain discharge, PCB, relay, float switch
activated
02
Outdoor unit
Activation of the safety device
Activation of PSH, locked motor, abnormal operation in the
power supply phase
03
Transmission
Abnormal transmission between outdoor and
indoor units
Incorrect wiring, failure of PCB, tripping of fuse, power supply
OFF
04
Abnormal transmission between inverter PCB
(DIP-IPM) and outdoor unit PCB (PCB1)
Abnormal transmission between PCB
05
Power supply
Abnormal operation of picking up phase signal
Main power supply phase is reversely connected or one phase
is not connected.
06
Voltage
Excessively low voltage or excessively high
voltage for the inverter
Incorrect wiring or insufficient capacity of power supply wiring
07
Cycle
Decrease in discharge gas superheat
Discharge gas superheat less than 10 degrees is maintained for
30 minutes.
08
Excessively high discharge gas temperature at
the top of compressor
Temperature of top compressor: Td
Td > 132°C over 10 minutes, or Td >140°C over 5 minutes
11
Sensor on indoor
unit
Air inlet thermistor
Failure of thermistor, sensor, connection.
12
Air outlet thermistor
13
Freeze protection thermistor
14
Gas piping thermistor
15
Econofresh
Abnormal operation of thermistor for fresh
outdoor air
16
Sensor on indoor
unit
Remote thermistor
Failure of thermistor
17
Thermistor of RCS
Failure of thermistor
19
Activation of the protection device for the indoor
fan motor
Failure of fan motor
21
Sensor on
outdoor unit
High pressure sensor
Incorrect wiring, disconnected wiring, broken cable, short circuit.
22
Thermistor for outdoor ambient temperature
(THM7)
Failure of thermistor, sensor, connection.
23
Thermistor for discharge gas temperature (THM9) Incorrect wiring, disconnected wiring, broken cable, short circuit.
24
Thermistor for evaporating temperature (THM8)
Failure of thermistor, sensor, connection.
29
Low pressure sensor
Incorrect wiring, disconnected wiring, broken cable, short circuit.
31
System
Incorrect capacity setting or combined capacity
between outdoor and indoor units
Incorrect setting of the capacity code.
35
Incorrect indoor unit number setting
Duplication of indoor unit number , number of indoor units over
specifications.
36
Incorrect indoor unit combination
R22 indoor unit
38
Abnormality of picking up circuit for protection
(Outdoor unit)
Failure of indoor unit PCB, incorrect wiring, connection to PCB
in indoor unit.
43
Pressure
Activation of the safety device from compression
ratio decrease
Abnormal compress (Compressor, Inverter damage)
44
Activation of the safety device from excessively
high suction pressure
Overload during cooling, high temperature with heating, loked
expansion valve
45
Activation of the safety device from excessively
high discharge pressure
Overload (obstruction of HEX, short circuit) mixture of inert gas
47
Activation of the safety device from excessively
low suction pressure (protection from vacuum
operation)
Shortage or leakage of refrigerant, piping clogging, expansion
valve close-locked, fan motor locked.
TROUBLESHOOTING
PMML0354A rev.1 - 03/2015
33
