Problem
AC not turning on?
Nothing. No beep, no flaps, no outdoor. Or the remote blinks and the wall unit ignores you. That’s still a job for the van.
Quick checks
Power at the isolator. Batteries in the remote. Isolator on the outdoor if you can reach it safely. If that’s all fine, stop poking.
What we find
Tripped supply. Dead indoor board. Outdoor that won’t start. We don’t guess from WhatsApp photos of a dark display. We come to the flat.