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My Ariston combi boiler is misbehaving!?

The boiler sounds like it is going to fire up but doesn't.
I never know whether it will work or not.
Having seen the answers to other questions on boilers, could it possibly be the diaphragm in the diverter valve? Or is it likely to be more serious than that?
Denise, March 2010
link Click here to see other fixes for Ariston.