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faulty combi boiler?

I have a ferroli f30 combi boiler with a fault on the hot water. Boiler fires water runs hot then burner cuts out water runs cold and repeats this sequence.
sharon, January 2012
No its not the thermistor already tried that.

sharon, January 2012
Can't give you an answer but mine does exactly the same so i will be interested in any replies. Is it the thermistor?

ian, January 2012
link Click here to see other fixes for Ferroli F30.