Mitsubishi Heavy Industries Error Codes & Diagnostics

Mitsubishi Heavy Industries E codes are not Mitsubishi Electric codes

Mitsubishi Heavy Industries publishes its own E-series fault codes, and they are unrelated to the codes used by Mitsubishi Electric despite the shared name. The two are separate companies with separate engineering, so a code table found for one will mislead on the other, sometimes convincingly. Applies to: Mitsubishi Heavy Industries room air conditioners documented in the MHI user manual library This page concerns Mitsubishi Heavy Industries room air conditioners documented in the MHI user manual library. Mitsubishi Electric equipment, sold as M-Series, Mr Slim, and Ecodan, is documented separately and carries different code meanings for the same characters. Owner-safe checks: Read the full manufacturer name and model number from the outdoor unit data plate and write them down before searching anything. | Note which indoor units are affected and which continue to work normally. | Confirm whether the remote control is still being acknowledged by the affected unit. Qualified technician: Testing the interconnecting cable, inspecting boards, and correcting address or configuration settings require the casings to be opened by a qualified technician. | Interconnecting cable between indoor and outdoor units carries mains voltage on this equipment, so it is not something to inspect, strip, or reterminate without the appropriate qualification.