Mitsubishi Electric E5

Medium

PLY-ZM/PLY-M/PEY-M/PCY-M serisi — Communication error between wired remote controller and indoor unit

Mitsubishi Electric E5: Communication error between wired remote controller and indoor unit This fault usually isn't an immediate stop, but should be checked soon.

Possible causes

Remote controller connecting wire is loose or broken
Electrical noise on the remote controller transmission wire

Check steps

Check the remote controller wiring for disconnection or loose contact
Power cycle the unit and re-check the error

Affected parts

Wired remote controller
Remote controller cable
Indoor PCB

Safety note

Disconnect power supply before working on the wiring.

Source: Mitsubishi Electric resmi servis kilavuzu (bagimsiz cift-dogrulandi) — Mitsubishi Electric Mr. SLIM Indoor Unit — Malfunction-diagnosis method at maintenance service (PLY-ZM50EA / PLY-M60,80,100,125EA / PEY-M50,60,80,100,125JAL / PCY-M125KAL), rev. 20241024, page 3, Output pattern A table: check code "E4, E5" → Description "Communication error between wired remote controller and indoor…

Reviewed by Anıl Güzeldemir — in the refrigeration machine room since 2006, developer of Enthalio.

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