112
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.
• When a system error occurs, the error code is displayed on the indoor unit or the wired control.
• If CH05/53/11 error occurs, check if auto-addressing is complete and the communication cables are properly installed.
Main component Problem Cause Solution
Compressor
Not operating
Motor insulation damaged. Check resistance between terminals and unit frames.
Strainer is clogged. Clean / change the strainer.
Oil is leaking. Check oil levels.
Stopped during operation.. Motor insulation failed.
After disconnecting the compressor wiring, check
resistance between terminals and unit frames.
Abnormal noise during operation.
Bad or improper R(L1) -
S(L2) - T(L3)
connections.
Check compressor R(L1) - S(L2) - T(L3)
connections.
Outdoor Unit Fan
High pressure error when unit
operates in cooling mode.
Motor failure, bad
ventilation around outdoor
unit heat exchanger.
Check the outdoor unit fan operation after the outdoor
units have been turned off for a while.
If any obstacles are around the outdoor unit heat
exchanger, switch the outdoor unit OFF and remove.
Outdoor Unit EEV
Heating failure, frequent
defrost.
Bad connector contact. Check connector.
No operation sound after
switching on the power.
Coil failure. Check resistance between terminals.
Low refrigerant pressure.
Check refrigerant levels. Add refrigerant as
necessary.
Heating operation failed; outdoor
unit heat exchanger is frozen.
EEV clogged. Service necessary.
Low pressure error or discharge
temperature error.
Table 59: Main Component Errors.
MAIN COMPONENT ERRORS
Test Run Checklist, continued.
• Main power to the outdoor unit must always remain on during the cooling and heating seasons.
• Apply power after installation, and before performing the test run.
• Always apply power for six (6) hours to heat the crankcase heater before operating the system. The compressor will burn out if the crank-
case heater is not preheated for at least six (6) hours. The compressor will also be damaged if the crankcase heater has not preheated for
at least six (6) hours, and the system operates when the outdoor temperature is below 50°F).
Main Component Errors
To Next Page
Loading...
Need help?
General
