LG ARUN Series Service Manual page 95

Error
Error Type
No.
27*
Inverter compressor starting
Master
failure Error
271
Slave
272
I Error Diagnosis and Countermeasure Flow Chart
Is the Reactor Wire
connection
Normal?
Yes
Is the Inverter Cooling
Fan normal?
Yes
Is the Inverter PCB Assy
normal?
Yes
Recheck Power and Installation
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Only for training and service purposes
Error Point
Overcurrent on the IPM
No
No
No
Cooling Fan connector
Cooling Fan
IPM joing point
Check joining condition
1.Overcurrent on the PFC IPM (R,S,T)
2.IPM Overheat (Cooling Fan failure/Cooling
Fan connector disconnecte /Heat sink dis-
assembled)
3.Reactor connector disconnected or loose
4.Inveter PCB Assy failure
5.Low power input voltage to the outdoor unit
1.Check Inverter PCB Ass'y R,S,Tconnection
2.Check the wiring status
1.Check the cooling fan connection
2.Check the cooling fan wiring status
3.Check the cooling fan output voltage. (Main PCB Assy
CN15 FAN connctor voltage : AC 220V)
¡ Change the Main PCB, when no output
voltage.
4.Check the cooling fan motor open(measured value should
be within 1.7kΩ ±10%)
¡ Replace fan motor if motor wire is disconnected.
1.Check the Inverter PCB Assy IPM
¡ Replace inverter PCB assembly if abnormality found.
Reactor Wire connector
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Troubleshooting Guide
Main Reasons
LGE Internal Use Only