LG Multi V Manual page 85

Error
Error Type
No.
Over-increase of dis-
34
charge pressure of
compressor
I Error diagnosis and countermeasure flow chart
Is service valve opened ?
Yes
Are transmission
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 EEV
Check indoor unit PCB
Check in/outdoor installation
condition
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Only for training and service purposes
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 transmission
cable / pipe connection
No
Adjust refrigerant amount
No
Replace related parts
No
Clean indoor filter (heating)
/outdoor heat exchanger (cooling)?
No
Replace sensor of high pressure
- 85 -
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
Troubleshooting Guide
LGE Internal Use Only