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_TROUBLE SHOOTING GUIDE BOOK _
- 123 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n
Error diagnosis and countermeasure flow chart
1. Defective low pressure sensor
2. Defective outdoor/indoor unit fan
3. Refrigerant shortage/leakage
4. Deformation because of damage of refrigerant pipe
5. Defective indoor / outdoor unit EEV
6. Covering / clogging
(outdoor unit covering during the cooling mode/
indoor unit filter clogging during heating mode)
7. SVC valve clogging
8. Defective outdoor unit PCB
9. Defective indoor unit pipe sensor
Error
No.
Error Type Error Point Main Reasons
Error happens
because of 3 times
successive compres-
sor off due to exces-
sive drop of low pres-
sure by the low pres-
sure sensor
Excessive drop of
discharge pressure
of compressor
35*
Master
351
Slave1
352
Slave2
353
Slave3
354
Is service valve
opened?
Open service valve
Are communication cable/
piping normal?
Yes
No
Is amount of refrigerant
normal?
Yes
No
Is fan normal?
(in heating outdoor fan,
in cooling indoor fan)
Yes
Adjust the amount of
refrigerant (Additive charge)
check communication/
piping correction.
Check and replace related parts
Is strainer Ok?*
No
Replace the strainer
No
Replace the pressure sensor
Yes
Yes
Check indoor / outdoor unit LEV
Check Indoor unit PCB
Check indoor / outdoor unit
installation conditions
Yes
Are the values of manifold
and low pressure sensor same?
( Is the low pressure value
actually low?)
No
Is there pipe crack or trace
of refrigerant leakage?
Weld / reconnect the cracked
portion and recharge refrigerant
No
Yes
* If the temperature difference between inlet and outlet of strainer
is so large that frost or ice formation can be seen or confirmed
then clogging of strainer should be checked
(Notice: it is not full ice forming of strainer, in case that there is
not at inlet portion but at outlet portion)
Error No. Error Type Error Point Main Reasons
35*
Excessive drop of
discharge pressure
of compressor
Error happens
because of 3 times
successive com
-
pressor off due to
excessive drop of
low pressure by the
low pressure sensor
1. Defective low pressure sensor
2. Defective outdoor/indoor unit fan
3. Refrigerant shortage/leakage
4. Deformation because of damage of refriger
-
ant pipe
5. Defective indoor / outdoor unit EEV
6. Covering / clogging
(outdoor unit covering during the cooling
mode/ indoor unit filter clogging during
heating mode)
7. SVC valve clogging
8. Defective outdoor unit PCB
9. Defective indoor unit pipe sensor
- 122 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n
Error diagnosis and countermeasure flow chart
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
9. Indoor unit’s pipe temperature defect
10. Indoor unit pipe temperature sensor defect
Error
No.
Error Type Error Point Main Reasons
Error happens
because of 10 times
successive compres-
sor off due to over-
increase of high pres-
sure by high pressure
sensor
Over-increase of dis-
charge pressure of
compressor
34*
Master
341
Slave1
342
Slave2
343
Slave3
344
Is service valve opened ?
No
Open service valve
Are communication
cable / pipe connection
normal?
Yes
No
Is refrigerant
amount normal?
[refer refrigerant part]
Yes
No
Is fan normal?
(Indoor fan during heating
Outdoor fan during cooling)
Yes
No
Yes
Adjust refrigerant amount
Check and repair communication
cable / pipe connection
Replace related parts
Is filter blocked
(Heating:indoor,
Cooling:outdoor
heat exchanger)?
No
Clean indoor filter (heating)
/outdoor heat exchanger (cooling)?
Is value of high pressure
sensor same as Manifold
value(Is it high actually)?
No
Replace sensor of high pressure
Yes
Yes
Check indoor unit LEV
Check indoor unit PCB
Check in/outdoor installation
condition
Error No. Error Type Error Point Main Reasons
34*
Over-increase of
discharge pressure
of compressor
Error happens
because of 10 times
successive com
-
pressor off due to
overincrease of high
pressure by high
pressure sensor
1. Defect of high pressure sensor
2. Defect of indoor or outdoor unit fan
3. Deformation because of damage of refriger
-
ant 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
9. Indoor unit's pipe temperature defect
10. Indoor unit pipe temperature sensor defect
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