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Error code reference

Mitsubishi Air Conditioner Error Code E.PE2

Parameter storage device fault (main circuit board)

Mitsubishi codesMitsubishi air conditioner codes
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What the E.PE2 error code actually means

Your Mitsubishi air conditioner has detected a problem with the memory chip on its main control board, where important settings and configuration data are stored. This memory has either become corrupted or has stopped working properly, which means the unit cannot operate safely with potentially incorrect settings. A qualified service technician will need to evaluate or replace the main control board to fix this issue.

Diagnostic procedure

The full E.PE2 procedure

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Most common causes of E.PE2

Ranked by how often they cause this code
  1. 1EEPROM chip failure on main PCB
  2. 2Power surge or voltage spike
  3. 3Corrupted parameter data
  4. 4Age-related EEPROM degradation
  5. 5Main circuit board manufacturing defect

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Questions people ask about E.PE2

What does E.PE2 mean on a Mitsubishi air_conditioner?
E.PE2 indicates a parameter storage device fault on the main circuit board, specifically an EEPROM failure. The EEPROM is a memory chip that stores the unit's factory configuration and calibration data. When this chip fails or its data becomes corrupted, the system triggers E.PE2 to prevent operation with incorrect parameters. Contacting a Mitsubishi service representative is the recommended first step.
Will resetting the unit clear the E.PE2 error code?
A power reset will not clear E.PE2 if the underlying EEPROM failure is still present. Because the fault is tied to a hardware memory failure rather than a temporary sensor or communication glitch, the error will return immediately or shortly after restart. Persistent recurrence of E.PE2 after a reset confirms that board-level service is required.
How much does it cost to repair a Mitsubishi E.PE2 error?
Repair costs for E.PE2 vary depending on whether the main circuit board needs to be replaced or if reprogramming is possible. Main PCB replacement on a Mitsubishi air conditioner typically falls in the range of $300 to $800 or more, including parts and labor, depending on the model and unit size. Diagnostic fees from a certified technician will also apply and can range from $75 to $150 before any repair work begins.
Can I fix E.PE2 myself without a technician?
This fault is not a typical field-serviceable issue and generally cannot be resolved without specialized tools or board replacement. Because the fault originates within the EEPROM chip on the main PCB, there are no user-accessible adjustments or resets that address the root cause. A qualified Mitsubishi service technician should evaluate the unit and determine whether board replacement or reprogramming is required.
Is it safe to run my Mitsubishi air conditioner while E.PE2 is displayed?
The unit will typically not operate normally while E.PE2 is active, as the control system locks out operation when it detects invalid parameter data. Attempting to force operation in this condition is not recommended because the unit may not function within its correct capacity or safety limits. Leave the unit powered down and contact a service representative promptly.

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