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Error code reference

Mitsubishi Air Conditioner Error Code E.RET

Retry count excess

Mitsubishi codesMitsubishi air conditioner codes

Retry count excess - operation could not resume properly within the number of retries set in Pr.67.

First step from the service manual

Find the cause of the fault occurrence and eliminate the cause of the preceding error.

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

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What E.RET means on a Mitsubishi air conditioner

E.RET is a retry count excess error on Mitsubishi air conditioning systems. It occurs when the unit attempts to resume normal operation after a fault condition but fails to do so successfully within the number of retry attempts configured in parameter Pr.67. The retry function is a built-in recovery mechanism that automatically tries to restart the system after certain transient faults. When those retries are exhausted without a successful restart, the controller locks out and displays E.RET to alert the technician that a more persistent underlying problem exists.

This error is essentially a secondary fault indicator. It does not point directly to a failed component on its own. Instead, it signals that a preceding fault occurred repeatedly, and the system was unable to clear it through automatic recovery. The parameter Pr.67 defines the maximum number of retry attempts allowed, and once that threshold is crossed, the system halts and requires manual intervention. The underlying fault that triggered the repeated retries is the actual root cause to investigate.

Diagnosis requires reviewing the fault history to identify the original error code that preceded E.RET. Common sources include refrigerant pressure faults, inverter drive issues, communication errors, or motor protection trips that recurred faster than the retry interval could accommodate. Until the root cause fault is identified and corrected, resetting the unit will simply restart the retry cycle and result in the same lockout.

Source: manufacturer service documentation.

Common causes of E.RET

  1. 01

    Unresolved preceding fault condition

    Wiring / connection

    A prior fault such as a pressure trip, inverter fault, or temperature alarm recurred repeatedly before the retry limit was reached. Reviewing the stored fault history is essential to identify this original error code.

  2. 02

    Refrigerant pressure abnormality

    Part replacement

    Low or high refrigerant pressure faults are common triggers for repeated retries. Inspect system pressures and check for refrigerant loss, blocked coils, or a failing pressure sensor.

  3. 03

    Inverter or drive board fault

    Part replacement

    An intermittent inverter fault can cause repeated failed restart attempts. Check for fault history codes related to overcurrent, overvoltage, or inverter module errors.

  4. 04

    Communication error between indoor and outdoor units

    Wiring / connection

    Wiring issues or board faults on the communication circuit can cause repeated dropout and retry cycles. Inspect the inter-unit wiring and terminal connections for damage or loose contacts.

  5. 05

    Motor or compressor protection trip

    Part replacement

    Overheating or overcurrent conditions on the fan motor or compressor can trigger protection shutdowns that repeat before the retry count is exhausted. Check motor windings and thermal protection components.

See the test procedure for each cause

Frequently asked questions about E.RET

What does E.RET mean on a Mitsubishi air_conditioner?
E.RET means the system exceeded the retry count set in parameter Pr.67 while attempting to resume operation after a fault. The unit tried to restart automatically a set number of times and failed each time. This lockout requires a technician to identify and resolve the original fault before the system will operate again.
Can I fix E.RET myself without a technician?
In most cases, no. E.RET is a secondary error that points to a recurring underlying fault, and identifying that fault typically requires access to the unit's fault history and diagnostic tools. Homeowners can check for obvious issues like blocked airflow or tripped breakers, but resolving the root cause usually requires a qualified HVAC technician.
Is it safe to keep running my air conditioner when E.RET is displayed?
No, the unit will not operate while E.RET is active since the system has locked itself out. Attempting to force operation without addressing the underlying fault could cause further damage. The unit should remain off until the root cause is diagnosed and corrected.
Will resetting the unit clear the E.RET error?
A reset may temporarily clear the error, but if the underlying fault condition still exists, the unit will begin its retry cycle again and eventually return to the E.RET lockout. The error will continue to reappear until the original fault is diagnosed and repaired.
How much does it cost to repair an E.RET error on a Mitsubishi air conditioner?
Repair costs vary widely depending on the root cause fault. A simple wiring fix or refrigerant recharge might cost between $150 and $400, while component replacements such as an inverter board or compressor can range from $400 to $1,500 or more. A diagnostic service call is typically needed first to identify the specific underlying fault.

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