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Combi Boiler only heating water when the heating is on?

Our Fonderie Sime Combi Boiler will only heat the water when the heating is on. If it is off the boiler will not fire up for the water. The boiler works fine on the radiators. Please help
kelly robinson, March 2005
h i the diafraghm on the domestic hot water is broken change it and it will cure the problem

joseph Rosenzweig, January 2008
WATER DIAPHAM GONE ON DHW SIDE ABOUT 10 QUID FOR KIT

STEVE BH HEATING, March 2005
link Click here to see other fixes for Sime.