E1

Remote controller 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 critical internal fault within the remote controller's memory, which is essential for storing settings and operational data. The remote controller will be unable to retain settings and function correctly, making system control unreliable.

Repair Steps

  1. 1

    Power down the unit and disconnect the faulty remote controller.

  2. 2

    Replace the defective remote controller with a new, compatible model.

  3. 3

    Reconfigure all necessary settings, such as operating modes, schedules, and addresses, on the new remote controller.

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Verified technical data. Last updated: March 2026
Source: Mitsubishi Electric PUZ-HA30/36NHA4 Outdoor Unit
Mitsubishi Electric Error E1: Remote controller nonvolatile memory error — Troubleshooting Guide | ErrorLib