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my heating comes on fine but hot water wont stay hot?

my ferroli boiler has working heating but the hot water heats up a little then runs cold and wont reheat
kerry, February 2013
your rubber diaphram need replacing as it is worn out you could buy them reletively cheap, instead of buying the whole diverter

anjum, February 2013
dhw flow temp sensor or dhw flow meter needs replacing

mjr, February 2013
Hot water heat exchanger is blocked need clean with sprit of salt ,need engineer to clean

ltd, February 2013
link Click here to see other fixes for Ferroli.