We've battled with the aircon unit in our offices for years :-) Over time we've worked out most of the cryptic instructions and even the black air of which unit covers which area.
However, one thing we've never worked out is what does it mean when it says "Standby" on the local control? We infer it means "sort of off" as the aircon isn't run in that area.
But... it should have been. The room was freezing but no matter what we could do, it steadfastly said standby.
Today though, standby has disappeared and the unit is working normally, as it usually does.
We've got the engineers coming in but each time it appears to work for them.
Asking in DIY as in the past I've had some great advise from here.
Cheers, Rob.