LG ACHH Series Manual page 72

Error code check
Error number Errors
Excessive drop of
35 discharge pres-
(351) sure of compres-
sor
n Failure diagnosis method
Are communication 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
EEV check / PCB check /
Installation environment check
Meaning
Error happens because of 3
times successive compres-
sor off due to excessive
drop of low pressure by the
low pressure sensor
No
check communication/
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
No
Replace the strainer
No
Replace the pressure sensor
[Note 1] If freezing is confirmed visibly due to a severe temperature difference
between the front and the rear of a strainer or the temperature difference is con-
firmed, strainer clogging should be doubted. (Warning: Doubting in case where freez-
ing on the front of the strainer is removed and then the freezing is occurred all the
sudden by passing around, not the whole freezing
Main cause of occurrence
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
No
Adjust the amount of
refrigerant (Additive charge)
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