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Part 5. Trouble Shooting
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Title
code
35
Low Presser Error
■ Error diagnosis and countermeasure flow chart
Is service valve
opened?
Yes
Are communication cable/
piping normal?
Yes
Is amount of refrigerant
normal?
[refer refrigerant part]
Yes
Is strainer Ok?*
Yes
Are the value of manifold
gauge and 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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Only for training and service purposes
Cause of error
Excessive decrease of low
pressure
Open service valve
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
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)
- 90 -
Check point & Normal condition
• Defective low pressure sensor
• Defective outdoor/indoor unit fan
• Refrigerant shortage/leakage
• Deformation because of damage of refrigerant pipe
• Defective indoor / outdoor unit EEV
• Covering / clogging (outdoor unit covering during
the cooling mode / indoor unit filter clogging dur-
ing heating mode)
• SVC valve clogging
• Defective outdoor unit PCB
• Defective indoor unit pipe sensor
No
Adjust the amount of
refrigerant (Additive charge)
LGE Internal Use Only
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Troubleshooting
