Error code
live-operation-lamp-off Standby during multisystem operation
How it shows on the unit Operation lamp off; live operating-status table
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
The indoor unit is in standby because another indoor unit connected to the same multisystem outdoor unit is using an incompatible operating mode; no error or no fault is indicated.
What you can check yourself
- If needed, set the connected indoor units to compatible modes such as cooling/fan or heating, rather than conflicting modes.
Still not resolved? Contact a qualified installer or servicer.
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.
Using Claude Code or Meta Muse? Connect HeatPump AI and ask it about live-operation-lamp-off.