Main Component Errors - LG Multi V5 Service Manual

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
Table 59: Main Component Errors.
Main component
Compressor
Abnormal noise during operation.
High pressure error when unit
Outdoor Unit Fan
Outdoor Unit EEV
Heating operation failed; outdoor
unit heat exchanger is frozen.
Low pressure error or discharge
• 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.
112
Problem
Not operating
Stopped during operation..
operates in cooling mode.
Heating failure, frequent
defrost.
No operation sound after
switching on the power.
temperature error.
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Cause
Motor insulation damaged. Check resistance between terminals and unit frames.
Strainer is clogged.
Oil is leaking.
Motor insulation failed.
Bad or improper R(L1) -
S(L2) - T(L3)
connections.
Check the outdoor unit fan operation after the outdoor
Motor failure, bad
ventilation around outdoor
unit heat exchanger.
exchanger, switch the outdoor unit OFF and remove.
Bad connector contact.
Coil failure.
Low refrigerant pressure.
EEV clogged.
Solution
Clean / change the strainer.
Check oil levels.
After disconnecting the compressor wiring, check
resistance between terminals and unit frames.
Check compressor R(L1) - S(L2) - T(L3)
connections.
units have been turned off for a while.
If any obstacles are around the outdoor unit heat
Check connector.
Check resistance between terminals.
Check refrigerant levels. Add refrigerant as
necessary.
Service necessary.