LG Air Conditioner Error Code E559

E559 means the indoor unit has stopped operating because it detected an unconfirmed or unclassified fault condition on the outdoor unit. The indoor unit shuts down as a protective measure when it cannot identify the specific nature of the outdoor unit problem. The outdoor unit itself should be inspected for additional fault codes or visible signs of failure to determine the actual root cause.

No. E559 causes the indoor unit to stop operation automatically, so the system will not run in this state. Attempting to force the unit to operate while an unresolved outdoor unit fault exists could risk damaging components further. The fault should be diagnosed and cleared before resuming normal operation.

Repair costs vary widely depending on the root cause. If the issue is limited to wiring or a simple control board reset, service call fees alone may range from $75 to $150. If the outdoor control board requires replacement, parts and labor can range from $300 to $700 or more. Compressor or inverter module failures represent the most expensive repairs, potentially ranging from $600 to over $1,500 depending on the system size and parts availability.

Some causes of E559, such as a tripped breaker, loose communication wiring, or a recoverable power surge, can be addressed without professional help. However, diagnosing control board failures, compressor issues, or inverter module faults requires electrical testing equipment and knowledge of high-voltage AC systems. If a basic power cycle and wiring inspection do not resolve the error, a licensed HVAC technician should be consulted.

A full power cycle, which includes turning off the breaker for several minutes and restarting, may clear E559 if the fault was caused by a transient power event. However, if an underlying hardware problem exists on the outdoor unit, the error will return after reset. A recurring E559 after reset indicates a persistent fault that requires hands-on diagnosis.