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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
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 Check for Problem Solution
1
How long has power been on during
operation?
3RZHUKDVEHHQRQIRUKRXUV Go to Step 2.
3RZHUKDVEHHQRQIRUKRXUV
Go to Step 2 after power has been on
for 12 hours.
2
Does error occur again after starting
operation?
Test 1
Ohm meter testing terminal to terminal
on the compressor.
Test 2
Ohm meter testing terminal to pipe
JURXQG7KLVUHDGLQJPXVWEH0
1. The compressor stops and same error
appears again.
Check if IPM has failed.
2. Inverter output voltage is stable (1). • Check insulation and coil resistors.
If both are normal, restart the unit. If
the same error occurs again, replace
the compressor.
• ,QVXODWLRQUHVLVWRU0ȍPHD-
sured.
• Coil resistors for 208-230V and 460V
Heat Pump and Heat Recovery Units.
3. Inverter output voltage is unstable or
0V (if digital tester is unavailable).
Check the IPM. If normal, replace the
inverter board.
Check coil and insulation resistors.
Comp.
Meter
Pipe
JQC068MA
Temp. 77°F 167°F
U-V ȍ ȍ
V-W ȍ ȍ
W-U ȍ ȍ
JQC048MA
Temp. 77°F 167°F
U-V ȍ ȍ
V-W ȍ ȍ
W-U ȍ ȍ
JQC068MB / JQC068MBA
Temp. 77°F 167°F
U-V ȍ ȍ
V-W ȍ ȍ
W-U ȍ ȍ
JQC048MB / JQC048MBA
Temp. 77°F 167°F
U-V ȍ ȍ
V-W ȍ ȍ
W-U ȍ ȍ
Comp.
Tester
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