LG Air Conditioner Error Code 220

Error code 220 on an LG air conditioning system signals a transmission error between HR unit 5 and the outdoor unit. This means the two components have lost communication over their dedicated signal wiring. The system flags this fault to prevent operating in an uncontrolled state, and the affected zone or system may shut down until communication is restored.

The system may limit or suspend operation on its own when error 220 is active, but continuing to attempt to run the system without addressing the fault is not recommended. Communication failures between components can lead to uncoordinated operation and potential additional damage to the control boards or connected equipment. Have the fault diagnosed promptly.

A power reset may temporarily clear the error code, but if the underlying communication fault between HR unit 5 and the outdoor unit has not been corrected, the error will return once the system attempts to re-establish communication. A reset is useful for confirming whether the fault is intermittent, but it is not a permanent fix and should not replace proper diagnosis.

Some basic checks are within reach for a knowledgeable homeowner, such as visually inspecting accessible wiring connections for obvious looseness or damage. However, properly diagnosing the transmission cable integrity, reading the HR unit PCB LED status, and testing or replacing PCBs requires technical experience and access to internal components. Most repairs beyond a simple connection tighten should be handled by a qualified technician.

Repair costs depend on the root cause. If the fix is simply reseating or replacing a transmission cable, costs are generally low, typically in the range of $75 to $200 for labor. If an HR unit PCB or outdoor unit control board requires replacement, costs can rise to the range of $300 to $800 or more depending on parts availability and labor rates in your area.