8 Troubleshooting
Alarm codes displayed in the remote control switch
SMGB0137 rev.0 - 05/2021
283
8
8.4 Alarm codes displayed in the remote control switch
The list of the alarms which are actually shown in the remote control switch display may vary depending on the models
and combinations of indoor and outdoor units. The causes leading to the activation of a specic alarm in certain models
may not trigger the same alarm in other models, without this implying an abnormality.
Code Category Content of Abnormality Leading Cause
01 Indoor unit
Activation of protection device (Float
switch (*))
Activation of oat switch (High water level in drain pan,
abnormality of drain pipe, oat switch, or drain pan)
02 Outdoor unit
Activation of protection device (High
pressure cut)
Activation of PSH (Pipe clogging, excessive refrigerant, inert
gas mixing)
03
Communication
Abnormal communication between Indoor
units and outdoor units
Incorrect wiring, loose terminals, disconnected
communication cable, blowout of fuse, indoor unit power
OFF, Outdoor fuse meltdown
04
Abnormal communication between
inverter PCB and Outdoor PCB
Inverter PCB - outdoor PCB communication failure (loose
connector, wire breaking, blowout of fuse)
05 Supply phase Abnormality of power supply phases Incorrect power supply, open-phase
06 Voltage Abnormal inverter voltage Outdoor voltage decrease, insucient power capacity
07
Cycle
Decrease in discharge gas superheat
Excessive refrigerant charge, failure of thermistor, incorrect
wiring, incorrect piping connection, expansion valve locking
at opened position (Disconnect connector)
08
Excessively high discharge gas
temperature
Insucient Refrigerant Charge, Pipe Clogging, Failure of
Thermistor, Incorrect Wiring, Incorrect Piping Connection,
Expansion Valve Locking at Closed Position (Disconnect
Connector)
09 Fan motor
Activation of protection device for outdoor
fan
Fan motor overheat, locking
0A Communication
Abnormal communication between
outdoor units
Incorrect wiring, broken cable, loose terminals
0b
Outdoor unit
Incorrect outdoor unit address setting
Duplication of address setting for outdoor units (Sub units) in
same refrigerant cycle number
0C
Main unit of the outdoor unit incorrectly
set
Two (or more) outdoor units set as "Main Unit" exist in same
refrigerant cycle number
11
Sensor on Indoor
Unit
Abnormality of inlet air thermistor
Incorrect wiring, disconnecting wiring,
breaking wire, short circuit
12 Abnormality of outlet air thermistor
13
Abnormality of freeze protection
thermistor
14 Abnormality of gas piping thermistor
15
Abnormality of outdoor air thermistor
(Econofresh)
16 Abnormality of remote sensor (DOAS)
17
Abnormality of thermistor built-in remote
Controller (DOAS)
18
Indoor fan motor
Abnormality of indoor fan system
Abnormality of indoor fan motor (Step-out), indoor fan
controller failure
19
Activation of protection device for indoor
fan
Fan motor overheat, lockup
1A
Indoor fan
controller
Abnormality of fan controller n
temperature
Abnormality of n thermistor or fan controller, heat
exchanger clogging, abnormality of fan motor
1b Activation of overcurrent protection Abnormality of fan motor
1C Problem with current sensor Abnormality of fan controller current sensor
1d Activation fan controller protection Driver IC error signal detection, instantaneous overcurrent
1E
Abnormality of indoor fan controller
voltage
Indoor voltage decrease, insucient capacity of power
supply wiring
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