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Over-current at the initial
operation of the compres-
26
sor / location sensing sig-
nal for compressor opera-
tion is not input
WARNING
Before checking PCB or each outdoor electric parts, wait for 3 minutes after the power is off. When measuring at standby state
of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts.
Yes
Recheck power and
installation condition
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Only for training and service purposes
Cause of error
• Compressor Locking
• Overload operation
(Outdoor fan constraint,
screened, blocked)
• Burned parts inside
PCB(IPM)
• Burned PCB phase current
sensing circuit parts
- 61 -
Part 5. Trouble Shooting
Check point & Normal condition
• Check compressor locking
• Compressor wire open/short
• Check compressor insulation damage
• Check outdoor fan constraint / screened / flow
structure
• Check if IMP burned (refer to CH21)
• Check on-PCB current sensing circuit parts
5V_GND
5V_GND
5V_GND
DC_LINK
LGE Internal Use Only
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