Mitsubishi Electric Mini-split E5 Error Code — Meaning & Causes (2026)
Communication error between wired remote controller and indoor unit (transmitting error at the indoor unit). Below: what triggers it and what to check — this code carries no single repair to price. Reviewed July 2026.
What E5 means
Communication error between wired remote controller and indoor unit (transmitting error at the indoor unit).
Likely causes, most common first
- Loose or incorrect remote controller wiring at the indoor unit
- Electrical noise on the transmission wire
Base: 2 published national repair-cost guides (retrieved 2026-07) · full source registry on the methodology page · Code meaning & causes · Reviewed July 2026
No single repair to price for this code
E5 doesn't point at one failed component, so we don't attach a price module — forcing a repair mapping here would be dishonest. If the code keeps returning, the underlying symptom (not the code) is what gets priced: browse the ductless mini-split repair costs for the problem you're actually seeing.
Codes are universal — your location changes the repair price, never the code's meaning. See the methodology for the exact localization formula and sources.
Reviewed by a Red Seal–certified appliance technician who also holds a Technical Safety BC gas ticket (Gas-C) and an ODS/halocarbon refrigerant ticket (CFC/HCFC/HFC).