Mitsubishi Air Conditioner Error Code E.CDO

E.CDO indicates that the output current detected by the inverter drive has exceeded the level set in parameter Pr.150. This fault only activates when parameter Pr.167 is set to 1, enabling the overcurrent detection function. The system shuts down to protect the compressor and inverter components from damage caused by excessive current.

The E.CDO fault is a protective shutdown, meaning the system has already responded to prevent damage. Operating a unit with a genuine overcurrent condition can lead to compressor failure or inverter board damage if the root cause is not addressed. Do not repeatedly reset and restart the unit without identifying and correcting the underlying fault.

Repair costs vary widely depending on the root cause. If the fault is due to incorrect parameter settings, a technician visit to reconfigure the drive may cost in the range of $75 to $200. Wiring repairs typically fall in the $100 to $300 range, while inverter board replacement can run $300 to $700 or more. Compressor replacement is the most expensive scenario, often ranging from $600 to $1,500 or higher depending on the unit size and labor rates.

Start by checking the settings for parameters Pr.150, Pr.151, Pr.166, and Pr.167 to confirm they are configured correctly for your unit. If the parameters are correct, inspect the output wiring for damage and measure the actual running current of the compressor. If wiring and settings are both confirmed good, the compressor or inverter board may need further evaluation and possible replacement.

A reset may temporarily clear the E.CDO fault, but if the underlying cause, whether a parameter setting, wiring issue, or failing component, is not corrected, the fault will return. Repeated resets without resolving the root cause risk causing additional damage to the compressor and inverter. A proper diagnostic inspection should be completed before attempting a reset.