LG ARUV Series Service Manual page 286

Troubleshooting Guide
Error No.
Outdoor voltage sensing
172(Sub3)
error
Error No.
173
(MAIN constant)
174, 175
Abnormal staring of
constant compressor
(sub1 constant 1,2)
176, 177
(sub2 constant 1,2)
Error diagnosis and countermeasure flow chart
Is resistance value
(insulation & phase to phase)
of corresponding constant
compressor normal ?
[refer electric
component part]
Yes
Is cables' connection
of compressor normal?
Yes
Is discharge temperature
sensor of compressor
normal? [refer electric
component part]
Yes
Is magnet switch
normal? [refer electric
component part]
Yes
Is outdoor air temperature
sensor normal?
Yes
Replace outdoor unit PCB
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Error Type
Abnormal resistance value of
sensor measurement
( Open / Short )
Error Type
Over-increase of temperature
after constant compressor
starts
No
Replace constant compressor
No
Adjust connection of cables
*
No
Replace discharge
temperature sensor
No
Replace magnet switch
No
Replace outdoor air
temperature sensor
Error Point
Refer to CH49
Error Point
• Defect of constant compressor
• Defect of discharge temperature sensor
• Defect of outdoor temperature sensor
• Defect of outdoor PCB
• Defect of magnet switch
• Wrong connection of constant compres-
sor cables
* cables connection between constant compressor
and magnetic switch
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Main Reasons
Main Reasons
LGE Internal Use Only