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Error code

live-left-operation-lamp-blink Unit fault indication

Fault

Mitsubishi Electric · EF

How it shows on the unit Left operation lamp blinking during normal operation; live fault indication

Applies to 39 models
MSZ-EF22VG2W, MSZ-EF25VG2W, MSZ-EF35VG2W, MSZ-EF42VG2W, MSZ-EF50VG2W, MSZ-EF22VG2B, MSZ-EF25VG2B, MSZ-EF35VG2B, MSZ-EF42VG2B, MSZ-EF50VG2B, MSZ-EF22VG2S, MSZ-EF25VG2S, MSZ-EF35VG2S, MSZ-EF42VG2S, MSZ-EF50VG2S, MSZ-EF18VGK2W, MSZ-EF22VGK2W, MSZ-EF25VGK2W, MSZ-EF35VGK2W, MSZ-EF42VGK2W, MSZ-EF50VGK2W, MSZ-EF18VGK2B, MSZ-EF22VGK2B, MSZ-EF25VGK2B, MSZ-EF35VGK2B, MSZ-EF42VGK2B, MSZ-EF50VGK2B, MSZ-EF18VGK2S, MSZ-EF22VGK2S, MSZ-EF25VGK2S, MSZ-EF35VGK2S, MSZ-EF42VGK2S, MSZ-EF50VGK2S, MUZ-EF25VG2, MUZ-EF35VG2, MUZ-EF42VG2, MUZ-EF50VG2, MUZ-EF25VGH2, MUZ-EF35VGH2

What this means

A blinking left operation lamp is listed as a condition requiring the unit to be stopped and checked by the dealer.

When to call a technician

This fault involves refrigerant, pressure, or electrical work that must be handled by a certified technician under EU F-gas rules. Do not attempt to open the refrigerant circuit, access mains wiring, or adjust pressure components yourself. Contact a qualified installer or servicer for this one.

See the Mitsubishi Electric manual (hosted by an authorized distributor)Hosted by an authorized distributor rather than by the manufacturer. We link to manuals, we never host them.

Other EF codes

Using Claude Code or Meta Muse? Connect HeatPump AI and ask it about live-left-operation-lamp-blink.