LG ARUV Series Service Manual page 262

Troubleshooting Guide
Error
Error Type
No.
35
(Main)
144
(Sub1)
Excessive drop of
146
discharge pressure
(Sub2)
of compressor
170
(Sub3)
Error diagnosis and countermeasure flow chart
Is service valve
opened?
Yes
Are transmission cable/
piping normal?
Yes
Is amount of refrigerant
normal?
[refer refrigerant part]
Yes
Is fan normal?
(in heating outdoor fan,
in cooling indoor fan)
Yes
Is strainer Ok?*
Yes
Are the values of manifold
and low pressure sensor same?
( Is the low pressure value
actually low?)
Yes
Check indoor / outdoor unit LEV
Check Indoor unit PCB
Check indoor / outdoor unit
installation conditions
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Error Point
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
Open service valve
No
check transmission/
piping correction.
No
Is there pipe crack or trace
of refrigerant leakage?
Yes
Weld / reconnect the cracked
portion and recharge refrigerant
No
Check and replace related parts
(error 105~108 reference)
No
Replace the strainer
No
Replace the pressure sensor
* 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)
- 262 -
Main Reasons
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
No
Adjust the amount of
refrigerant (Additive charge)
LGE Internal Use Only