E1

Remote Controller Control Board Nonvolatile Memory Error

Mitsubishi Electric · PUZ-HA30/36NHA4 Outdoor Unit

What does E1 mean?

Data cannot be read normally from the nonvolatile memory of the remote controller control board. This indicates a defective remote controller.

Common Causes

  • Nonvolatile memory on the remote controller's control board has failed.
  • Corruption or erasure of stored configuration data.
  • Hardware failure of the memory chip.
  • Power surge affecting the control board.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the remote controller.

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Verified technical data. Last updated: March 2026

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Source: Mitsubishi Electric PUZ-HA30/36NHA4 Outdoor Unit