LG Heat Pump Error Code E207

E207 means the address configured on the MCU does not match the address set on the connected indoor unit. This prevents the two components from communicating properly on the control bus. It is a configuration issue and not a refrigerant or mechanical fault. Correcting the address settings and restarting the system will resolve it in most cases.

A simple power reset will not clear E207 because the underlying address mismatch will still exist after the unit restarts. The address settings on the MCU and the indoor unit must first be corrected to match each other. Once the configuration is fixed, a full power-down and restart will allow the system to reinitialize and clear the fault.

If the fix is simply a matter of correcting address settings, the cost is primarily a service call fee, which typically ranges from $75 to $150 depending on your location and the technician. If a control board has failed and needs replacement, parts and labor combined can range from $200 to $600 or more depending on the specific board required. Getting a diagnostic visit first will help clarify whether any parts are actually needed.

If you are comfortable accessing the control boards and understand how to read DIP switch configurations or navigate system setup menus, you may be able to correct the address mismatch yourself. However, improperly changing address settings on a multi-zone system can affect other units on the same network. A qualified HVAC technician is recommended to ensure all addresses are correctly assigned across the full system.

E207 is a communication and configuration fault, so the system will typically not operate normally while this code is active. Attempting to force operation while the address mismatch exists risks the wrong unit responding to control signals or no unit responding at all. It is best to resolve the error before using the system to avoid further issues.