Mitsubishi Air Conditioner Error Code PS

PS stands for PU Stop and indicates that the STOP/RESET button was pressed while the unit was operating in a mode other than PU operation mode. This creates a control conflict because the stop command came from an incompatible input source for the active mode. The unit halts the motor and displays PS until the condition is properly cleared. It is a control logic flag, not a component failure.

A simple power cycle may temporarily clear the PS display, but if the underlying mode conflict is not resolved, the error will return as soon as the unit is operated and the STOP/RESET button is pressed again in the wrong mode. The correct procedure requires turning the start signal OFF and releasing the fault through the proper PU/EXT mode selection.

In most cases, the PS error requires no replacement parts and involves only a procedural correction to the operating mode and control signals. If a service technician is called to diagnose and clear the fault, you can expect a standard diagnostic service call fee, typically in the range of $75 to $150 depending on your region. If a faulty mode selector component is identified, parts and labor costs would be additional.

To clear the PS error, first turn the external start signal OFF. Then switch the operating mode to PU or PU/EXT as appropriate for your installation. Once the correct mode is active, use the PU/EXT setting to release the fault and resume operation. Do not attempt to restart without addressing the mode conflict, as the fault will likely return.

The PS error itself does not indicate a dangerous electrical or mechanical failure. The unit stops the motor as a controlled response to a conflicting control input, which is a normal protective behavior. However, the system will remain non-operational until cleared, so addressing it promptly is important for comfort and system health.