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
Replace the remote controller.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric PUZ-HA30/36NHA4 Outdoor Unit