Mitsubishi air conditioner error code 06 indicates a problem with the communication between the outdoor unit and the indoor unit. This error code can occur due to several reasons， such as faulty wiring or a malfunctioning PCB.

To troubleshoot this error， the first step is to turn off the power supply and check the wiring connections between the indoor and outdoor units. Ensure that all wiring is secure and that there are no loose connections or damaged cables.

If the wiring checks out， the next step is to check the PCB for any malfunctions. This may require the services of a trained technician who can perform a thorough diagnostic test of the air conditioner’s electronic components.

Once the cause of the error has been identified， the technician will be able to recommend the appropriate course of action. This could range from replacing a faulty component， such as the PCB， to repairing or replacing the entire air conditioning unit.

It is important to address error code 06 as soon as possible to avoid further damage to the air conditioning system. Regular maintenance and cleaning of the air conditioning unit can prevent future error codes and ensure the efficient and reliable operation of the system.