E1
Remote Controller Control Board Nonvolatile Memory Error
Mitsubishi Electric · Mitsubishi 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.
Source: Mitsubishi PUZ-HA30-36NHA4 Outdoor Unit
Open Manual (Page 29)