LG Air Conditioner Error Code 200

Error code 200 on an LG air conditioner indicates a pipe detection error specific to HR (Heat Recovery) multi-zone systems. It means the system detected a different number of indoor units through the refrigerant pipe Auto detection process than the number of indoor units currently communicating on the control network. The first step in diagnosing this error is checking whether the green transmission LED on the HR unit is blinking periodically, which confirms active communication.

Error code 200 indicates the system cannot confirm all indoor units are properly detected and communicating, which means the system is not operating as configured. Continuing to run the system in this state may result in uneven cooling or heating, with some zones potentially not functioning correctly. It is best to address the fault before relying on the system for consistent comfort or extended operation.

A power reset may temporarily clear error code 200, but if the underlying cause such as a wiring fault, lost indoor unit power, or incorrect address setting is not corrected, the error will return when the system runs its Auto pipe detection again. Resetting without fixing the root cause is not a lasting solution. The system should be fully diagnosed to identify which indoor unit or HR unit component is responsible for the mismatch.

Some causes of error 200, such as a tripped breaker cutting power to an indoor unit or a loose wire at a communication terminal, can be inspected by a knowledgeable homeowner. However, diagnosing HR unit communication boards, verifying address settings, and checking refrigerant pipe connections typically requires a trained HVAC technician with familiarity with LG multi-zone systems. Attempting to access refrigerant components without proper certification is not recommended.

If the fix is simply reseating a loose communication wire or restoring power to an indoor unit, the cost may only involve a service call fee, typically in the range of $75 to $150. If a communication board in the HR unit needs replacement, parts and labor combined can range from $300 to $700 or more depending on the specific unit and local labor rates. A technician will need to diagnose the root cause before an accurate estimate can be provided.