LG Multi V CRUN Series

Self-diagnosis function
Service Manual 233
Fault diagnosis and Trouble shooting guide
Title
Display
code
Cause of errorMeaning
High pressure
34
• Malfunction of high pressure sensor
• Fan lock of indoor or outdoor unit
• Covering of indoor or outdoor heat exchanger
• Blocking in discharge pipe of compressor
Due to high pressure,
Compressor off has occurred
3 times in1 hour
The discharge pressure of
compressor is over the limit
Trouble shooting Flow
Does indoor/outdoor
fan operate?
Yes
Yes
Is the ventilation of
heat exchanger
smooth?
Yes
Remove the covering
material from heat exchanger
No
Check and replace the fan
and its drive part
No
Check whether pipe is blocked
and refrigerant state
Check and
replace PCB
Does discharge
pressure really rise?
No
Is high pressure
sensor normal ?
Replace high
pressure
sensor
No
Yes