Where can I find anybody who lives in a flat with 3 switches next to the door One of them seems to be for the water pump, and one for the central heating. And knows what is the third switch for

in

Amman, Jordan

?

That is a super tricky question because it differs from house to house and could be an array of things like a light or the water pump from the solar. I recommend you ask your landlord, or the Hares (janitor) and if you have neither of those or they cant help then ask a neighbor since most houses in buildings here are the same set up.