LG MULTI V 5 Manual Book page 54

Error No. Error Type Error Point
Error
Error Type Error Point
No.
Error happens
34*
because of 10 times
Error happens
Over-increase of successive com-
Master
because of 10 times
34* discharge pressure pressor off due to
341
successive compres-
Over-increase of dis-
of compressor overincrease of high
Slave1
sor off due to over-
charge pressure of
pressure by high
342 increase of high pres-
compressor
pressure sensor
Slave2 sure by high pressure
343 sensor
Slave3
344
n Error diagnosis and countermeasure flow chart
No
Is service valve opened ? Open service valve
Yes
Are communication
No
Check and repair communication
cable / pipe connection
cable / pipe connection
normal?
Yes
Is refrigerant
No
amount normal?
Adjust refrigerant amount
[refer refrigerant part]
Yes
Is fan normal?
No
(Indoor fan during heating
Replace related parts
Outdoor fan during cooling)
Yes
Is filter blocked
No
(Heating:indoor, Clean indoor filter (heating)
Cooling:outdoor /outdoor heat exchanger (cooling)?
heat exchanger)?
Yes
Is value of high pressure
No
sensor same as Manifold Replace sensor of high pressure
value(Is it high actually)?
Yes
Check indoor unit LEV
Check indoor unit PCB
Check in/outdoor installation
condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
106
Only for training and service purposes
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
1. Defect of high pressure sensor
Main Reasons
2. Defect of indoor or outdoor unit fan
3. Deformation because of damage of refriger-
1. Defect of high pressure sensor
ant pipe
2. Defect of indoor or outdoor unit fan
4. Over-charged refrigerant
3. Deformation because of damage of refrigerant pipe
5. Defective indoor / outdoor unit EEV
4. Over-charged refrigerant
6. When blocked
5. Defective indoor / outdoor unit EEV
- Outdoor unit is blocked during cooling
6. When blocked
- Indoor unit filter is blocked during heating
- Outdoor unit is blocked during cooling
7. SVC valve is clogged
- Indoor unit filter is blocked during heating
7. SVC valve is clogged 8. PCB defect of outdoor unit
8. PCB defect of outdoor unit
9. Indoor unit's pipe temperature defect
9. Indoor unit's pipe temperature defect
10. Indoor unit pipe temperature sensor defect
10. Indoor unit pipe temperature sensor defect
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LGE Internal Use Only
Error No. Error Type Error Point
Error
Error Type Error Point
No.
Error happens
35*
because of 3 times
Error happens
Excessive drop of successive com-
Master because of 3 times
35* discharge pressure pressor off due to
351 successive compres-
Excessive drop of
of compressor excessive drop of
sor off due to exces-
Slave1
discharge pressure
low pressure by the
sive drop of low pres-
352
of compressor
low pressure sensor
sure by the low pres-
Slave2
sure sensor
353
Slave3
354
n Error diagnosis and countermeasure flow chart
Is service valve
Open service valve
opened?
Yes
No
Are communication cable/ check communication/
piping normal? piping correction.
Yes
No
Is amount of refrigerant Is there pipe crack or trace
normal? of refrigerant leakage?
Yes Yes
Weld / reconnect the cracked
portion and recharge refrigerant
Is fan normal?
No
(in heating outdoor fan, Check and replace related parts
in cooling indoor fan)
Yes
No
Is strainer Ok?* Replace the strainer
Yes
Are the values of manifold
No
and low pressure sensor same?
Replace the pressure sensor
( Is the low pressure value
actually low?)
Yes
* If the temperature difference between inlet and outlet of strainer
Check indoor / outdoor unit LEV
is so large that frost or ice formation can be seen or confirmed
Check Indoor unit PCB
then clogging of strainer should be checked
Check indoor / outdoor unit
(Notice: it is not full ice forming of strainer, in case that there is
installation conditions
not at inlet portion but at outlet portion)
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Main Reasons
1. Defective low pressure sensor
Main Reasons
2. Defective outdoor/indoor unit fan
3. Refrigerant shortage/leakage
1. Defective low pressure sensor
4. Deformation because of damage of refriger-
2. Defective outdoor/indoor unit fan
ant pipe
3. Refrigerant shortage/leakage
5. Defective indoor / outdoor unit EEV
4. Deformation because of damage of refrigerant pipe
6. Covering / clogging
5. Defective indoor / outdoor unit EEV
(outdoor unit covering during the cooling
6. Covering / clogging
mode/ indoor unit filter clogging during
(outdoor unit covering during the cooling mode/
heating mode)
indoor unit filter clogging during heating mode)
7. SVC valve clogging
7. SVC valve clogging
8. Defective outdoor unit PCB
8. Defective outdoor unit PCB
9. Defective indoor unit pipe sensor
9. Defective indoor unit pipe sensor
No
Adjust the amount of
refrigerant (Additive charge)
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LGE Internal Use Only
107
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