Checking The Compressor - LG Multi V5 Service Manual

CHECKING THE COMPRESSOR

Checking the Compressor
If a compressor error, or any error related to the electrical system has occurred, check for the items below and follow the procedure listed.
Step Number
How long has power been on during
1
operation?
Does error occur again after starting
operation?
Test 1
Ohm meter testing terminal to terminal
on the compressor.
Comp.
Test 2
Ohm meter testing terminal to pipe
2
Comp.
114
Check for
1. The compressor stops and same error
appears again.
2. Inverter output voltage is stable (1).
Tester
Pipe
Meter
3. Inverter output voltage is unstable or
0V (if digital tester is unavailable).
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Problem
Go to Step 2.
Go to Step 2 after power has been on
for 12 hours.
Check if IPM has failed.
• Check insulation and coil resistors.
If both are normal, restart the unit. If
the same error occurs again, replace
the compressor.
•
sured.
• Coil resistors for 208-230V and 460V
Heat Pump and Heat Recovery Units.
Temp.
V-W
W-U
Temp.
V-W
W-U
Temp.
V-W
W-U
Temp.
Check the IPM. If normal, replace the
inverter board.
Check coil and insulation resistors.
Solution
JQC068MA
77°F 167°F
U-V
JQC048MA
77°F 167°F
U-V
JQC068MB / JQC068MBA
77°F 167°F
U-V
JQC048MB / JQC048MBA
77°F 167°F
U-V
V-W
W-U
-