[etccarmageddon]

Originally Posted by Caspar

Don't start me off!!!... I have to have my heating on upstair (not downstairs) to be able to heat hot water! ...the switch I fitted works fine....and is wired correctly, i think...my brother (a sparky), says that they are cross-wired somewhere in the house and it need a proper seeing to....

I might be wrong but this is what an engineer once told me...

it could be a fault in the valve in your central heating system - there's a valve that controls flow of hot water to both your heating and hot water - if it doesnt work correctly it sometimes means you need the heating on in order to get heat to your hot water. it's that square metal box that usually resides near your heating pump and the hot water tank.