Is that a difficult job and would I need a tradesman to do it? Sorry but I'm female and know nothing about these things!
**Oops, this was replying to the previous post **
Every so often our heating goes off for no apparent reason. If I lift the floorboard and put my hand down to a small metal box, I can lift a lever and the heating goes back on. I'm sorry I don't know what the box is called. It can work fine for weeks then suddenly go off. Can anyone help please?