Denso Air Conditioner Error Code LOCKED

LOCKED means the control panel's key lock mode is active, which disables all front-panel buttons to prevent unintended setting changes. The unit itself continues to operate normally in its current mode. This is not a fault code and does not indicate any component failure. It can be cleared by pressing the ENTER and SET CLOCK buttons simultaneously for 5 seconds.

Yes, the unit is safe to operate while in key lock mode. The air conditioner continues to run normally at its current settings; only manual panel input is restricted. There is no risk of equipment damage or safety hazard associated with the key lock state.

In most cases there is no repair cost at all, since the LOCKED condition is cleared through a button sequence and requires no parts or technician visit. If a stuck or faulty control panel button is preventing the lock from clearing, a service call and control panel button or panel assembly replacement could range from around $75 to $250 or more depending on parts availability and labor rates in your area.

Press and hold the ENTER and SET CLOCK buttons at the same time for approximately 5 seconds. This toggles the key lock mode off and restores full control panel functionality. If the buttons do not respond or the lock does not clear, check whether any panel buttons are physically stuck, and consider cycling power to the unit at the breaker before attempting the button sequence again.

A power cycle, such as turning off the breaker for several minutes and restoring power, may clear the key lock state if the standard button sequence is not working. However, the correct and intended method is the simultaneous ENTER and SET CLOCK button press held for 5 seconds. A power reset should be treated as a secondary troubleshooting step.