LG Multi V CRUN Series Service Manual page 233

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