my 820/20 only gives hot water when c/h is on can this be self repaired or do you know why

michael higginbotham, February 2005

I found out what boiler it is , its a ravenheat and it probably will be the diapragm in the divertor valve

Steve, February 2005

Give us a clue on the make of the boiler ???. Some combi boilers have a diagphram which turns on the boiler when you turn a hot tap on , these diaphragms split so the boiler doesnt fire up when you want hot water . Does the boiler do anything at all when you turn a tap on when the heating is off????

Steve, February 2005