9.2 MAIN ALARM CODES
Code Category Content of abnormality
01 Indoor unit Activation of protection device (oat switch)
02 Outdoor unit Activation of protection device (high pressure cut)
03
Transmission
Abnormality between indoor and outdoor
04 Abnormality between Inverter PCB and outdoor PCB
05 Supply phase Abnormality power source phases
06 Voltage Abnormality of voltage drop in outdoor unit
07
Cycle
Decrease in discharge gas superheat
08 Excessively high discharge gas temperature at top of compressor chamber
09 Outdoor unit Activation of protection device for outdoor fan
11
Sensor on indoor unit
Inlet air thermistor
12 Outlet air thermistor
13 Freeze protection thermistor
14 Gas piping thermistor
19 Fan motor Activation of the protection device for the indoor fan
20
Sensor on
outdoor unit
Compressor thermistor
21 High pressure sensor
22 Outdoor air thermistor
23 Discharge gas thermistor
24 Evaporating thermistor
29 Low pressure sensor
31
System
Incorrect capacity setting of outdoor unit and indoor unit
32 Incorrect setting of other indoor unit number
35 Incorrect setting of indoor unit number
36 Incorrect of indoor unit combination
38 Abnormality of picking up circuit for protection in outdoor unit
39 Compressor Abnormality running current at constant speed compressor
41
Pressure
Overload cooling
42 Overload heating
43
Protection device
Activation of pressure ratio decrease protection device
44 Activation of low pressure decrease protection device
45 Activation of low pressure increase protection device
46 Activation of high pressure increase protection device
47 Activation of high pressure decrease protection device
48 Activation of overcurrent protection device
51
Inverter
Abnormal inverter current sensor
52 Activation of inverter overcurrent protection
53 Activation of transistor module protection
54 Abnormality of inverter n temperature
56
Outdoor fan
Abnormality of detection for fan motor position
57 Activation of fan controller protection
58 Abnormality of fan controller
b0
System
Incorrect setting of unit capacity
b1 Incorrect setting of unit and refrigerant cycle number
b5 Incorrect setting of indoor unit number for H-LINK type
EE Compressor Compressor protection alarm
TROUBLESHOOTING
PMML0551 rev.4 - 07/2023 - A10762310A
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