126 Trouble Shooting Guide
Self-diagnosis function
■ Please refer to trouble shooting guide in service manual for each error title
CAUTION
In case that the control box is opened and before checking electrical parts, it should be checked that
the LED 01M (Refer to next page) turned off (wait 3 minutes after main power OFF), otherwise, it may
cause electrical shock.
Failing to receive fan signal at main PCB
Over-current of fan motor (IPM fault)
Low voltage of fan motor driver
Failing to receive main signal at fan PCB
Liquid pipe temperature sensor is open or short
Subcooling inlet temperature sensor is open or short
Subcooling outlet temperature sensor is open or short
Pressure unbalance between outdoor units
Transmission error : fan PCB ➡ main
PCB
Over-current of fan motor (IPM fault)
Low voltage of fan motor driver
Transmission error : main PCB ➡ fan
PCB
Liquid pipe temperature sensor
Subcooling inlet temperature sensor
Subcooling outlet temperature sensor
Failure of operation mode conver-
sion
Display Title Cause of Error
105
106
107
108
113
114
115
151
Transmission related
error
Outdoor unit
related error
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