LG MULTI V Service Manual page 122

Self-diagnosis function
Error
Error Type
No.
Over-increase of dis-
34
charge pressure of
compressor
n Error diagnosis and countermeasure flow chart
Is service valve opened ?
Yes
Are communication
cable / pipe connection
normal?
Yes
Is refrigerant
amount normal?
[refer refrigerant part]
Yes
Is fan normal?
(Indoor fan during heating
Outdoor fan during cooling)
Yes
Is filter blocked
(Heating:indoor,
Cooling:outdoor
heat exchanger)?
Yes
Is value of high pressure
sensor same as Manifold
value(Is it high actually)?
Yes
Check indoor unit LEV
Check indoor unit PCB
Check in/outdoor installation
condition
Error Point
Error happens
because of 3 times
successive compres-
sor off due to over-
increase of high pres-
sure by high pressure
sensor
No
Open service valve
No
Check and repair communication
cable / pipe connection
No
Adjust refrigerant amount
No
Replace related parts
(Refer to Error 105~107)
No
Clean indoor filter (heating)
/outdoor heat exchanger (cooling)?
No
Replace sensor of high pressure
- 122 -
Main Reasons
1. Defect of high pressure sensor
2. Defect of indoor or outdoor unit fan
3. Deformation because of damage of refrigerant pipe
4. Over-charged refrigerant
5. Defective indoor / outdoor unit EEV
6. When blocked
- Outdoor unit is blocked during cooling
- Indoor unit filter is blocked during heating
7. SVC valve is clogged
8. PCB defect of outdoor unit
10. Indoor unit pipe temperature sensor defect
Copyright © 2020 LG Electronics Inc.
All rights reserved. Only training and service purposes.