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Error code reference

Mitsubishi Air Conditioner Error Code E.CDO

Abnormal output current detection

Mitsubishi codesMitsubishi air conditioner codes

Abnormal output current detection - output current exceeded Pr.150 detection level setting (when Pr.167 = 1).

First step from the service manual

Check settings of Pr.150, Pr.151, Pr.166, and Pr.167.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E.CDO means on a Mitsubishi air conditioner

The E.CDO error code on a Mitsubishi air conditioner indicates an abnormal output current detection event. This fault is triggered when the output current from the inverter drive exceeds the threshold value configured in parameter Pr.150. This protection function is only active when parameter Pr.167 is set to 1, meaning the overcurrent detection feature has been explicitly enabled. The fault is part of the drive's built-in protection logic designed to prevent damage to the compressor, inverter components, and wiring from sustained or sudden overcurrent conditions.

Parameter Pr.150 defines the detection level for output current, and parameter Pr.151 typically governs the time or response characteristics associated with that detection. Parameter Pr.166 is also relevant to the overcurrent detection configuration and works alongside Pr.167 to determine how and when the fault is triggered. If any of these parameters are incorrectly set, the system may generate a false E.CDO fault even when actual current levels are within acceptable operating limits. Conversely, if settings are too permissive, genuine overcurrent conditions may go undetected until component damage occurs.

Common root causes include mechanical load issues such as a seized or restricted compressor, wiring faults causing excessive draw, or a failing inverter board producing uncontrolled output. Before replacing hardware, technicians should verify that all four parameters, Pr.150, Pr.151, Pr.166, and Pr.167, are configured correctly per the unit's specifications. If parameter settings are confirmed accurate, the investigation should shift to measuring actual output current and inspecting the compressor and wiring for faults.

Source: manufacturer service documentation.

Common causes of E.CDO

  1. 01

    Incorrect parameter configuration

    Wiring / connection

    If Pr.150, Pr.151, Pr.166, or Pr.167 are set incorrectly, the system may trigger E.CDO even when actual current is within normal range. Always verify these four parameters against the unit's required specifications as the first diagnostic step.

  2. 02

    Compressor mechanical fault or seizure

    Part replacement

    A compressor that is seized, partially locked, or operating under excessive mechanical load will draw abnormally high current, triggering this fault. Check compressor resistance and running amperage to identify this condition.

  3. 03

    Wiring fault or short circuit in output circuit

    Wiring / connection

    Damaged, shorted, or loose wiring between the inverter drive and the compressor can cause current spikes that exceed the Pr.150 detection threshold. Inspect output wiring and connections for signs of damage, corrosion, or contact faults.

  4. 04

    Failing or damaged inverter board

    Part replacement

    A degraded inverter board may produce unregulated or excessive output current even under normal load conditions. If parameter settings and wiring check out, measure actual output current and evaluate the inverter board for component failure.

  5. 05

    Refrigerant system issue causing overload

    Wiring / connection

    An overcharged refrigerant system or a blocked refrigerant circuit can increase compressor load significantly, raising current draw above the detection threshold. Check system pressures to rule out refrigerant-side contributions to the fault.

See the test procedure for each cause

Frequently asked questions about E.CDO

What does E.CDO mean on a Mitsubishi air_conditioner?
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.
How do I fix the E.CDO error on my Mitsubishi air conditioner?
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.
Is the E.CDO error on a Mitsubishi air conditioner dangerous?
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.
Will resetting the unit clear the E.CDO error code?
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.
How much does it cost to repair a Mitsubishi air conditioner showing E.CDO?
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.

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