Mitsubishi Electric ductless-mini-split — Mitsubishi Electric M-Series and Mr Slim systems that publish the E-series communication table Error Codes Directory

Mitsubishi Electric E6 error code: indoor to outdoor communication fault

Mitsubishi Electric assigns E6 to a communication error between the indoor and outdoor units, detected on the indoor side. The two ends have stopped exchanging their signal over the connecting cable, so the code identifies a broken conversation rather than a specific failed board. Applies to: Mitsubishi Electric M-Series and Mr Slim systems that publish the E-series communication table This meaning follows Mitsubishi Electric literature for the M-Series and Mr Slim families that publish an E-series table with E6 and E7. Mitsubishi Heavy Industries and other brands assign these characters differently, so confirm both model numbers before applying this page. Owner-safe checks: With the system off at the isolator, check for any obvious damage to the visible run of interconnecting cable and confirm no recent storm, outage, or rodent activity. | Record when E6 started, whether it followed any install or electrical work, and whether the outdoor fan turns while the code is shown. Qualified technician: Inspecting the S1, S2, S3 terminals, testing conductor continuity, and checking the board communication circuits all require isolating power and belong with a qualified technician.