Troubleshooting Guide
- 262 -
Copyright ©2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
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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 LEV
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
(Main)
144
(Sub1)
146
(Sub2)
170
(Sub3)
Is service valve
opened?
Open service valve
Are transmission cable/
piping normal?
Yes
No
Is amount of refrigerant
normal?
[refer refrigerant part]
Yes
No
Is fan normal?
(in heating outdoor fan,
in cooling indoor fan)
Yes
Adjust the amount of
refrigerant (Additive charge)
check transmission/
piping correction.
Check and replace related parts
(error 105~108 reference)
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)
Summary of Contents for ARNU07GB1G1
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