I have a switchmaster 900 fitted. I recently had a new cylinder fitted and a Landis & Staefa MAV322 fitted as the switch control which turns to hot water or hot water & central heating was not working properly. The plumber fitted it & told me that I would need an electrician to wire it in to the box. I have contacted an electrician but he will not attempt to wire it without a diagram. Can anybody help with a diagram.
