Mitsubishi Air Conditioner Error Code LOCd

LOCd indicates that the password protection function is active on your Mitsubishi air conditioner. This feature restricts access to the display and adjustment of system parameters. The unit continues to operate normally under its existing settings, but configuration changes cannot be made until the correct password is entered through parameter Pr.297. This is a security feature, not a malfunction.

No, LOCd does not indicate any safety issue, mechanical failure, or electrical fault. The air conditioner continues to operate normally while this code is displayed. The code simply means that parameter access is restricted due to an active password lock. There is no need for immediate service based on this code alone.

If you have access to the password, resolving LOCd costs nothing since it only requires entering the code in parameter Pr.297. If a technician is needed to recover or reset a lost password, you can expect to pay a service call fee, typically in the range of $75 to $200 depending on your location and the contractor's rates. No parts are required to resolve this condition.

To clear the LOCd code, navigate to parameter Pr.297 in the unit's parameter menu and enter the correct password. Once the valid password is accepted, the password lock will be deactivated and full access to parameters will be restored. If you do not know the password, contact the technician or contractor who installed or last serviced the unit, as they are most likely to have set and recorded it.

A standard power reset will not clear the LOCd code because the password lock is stored as a parameter setting within the unit's memory. Cycling power does not reset parameter configurations. The only way to remove the LOCd indicator is to enter the correct password through parameter Pr.297 or, in cases of a lost password, to work with a qualified technician who can access installer-level recovery options.