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my ariston a 23 mffi gives intermittant hot water ?

when calling for hot water the flame keeps modulating between high and low flame even though the water is still cool, could this be the pcb? if so which one as their are two, if not pcb what else could be the problem?
mick, January 2010
I have no hot water at all even when i have the rads on what can this be please

keith, January 2011
thanx, fitted new thermistor today and hot water now perfect

mick, January 2010
many thanks will try that and see, are these the ones on the diverter valve?

mick, January 2010
try replacing the sensors first, they cause a similar fault & are much cheaper

Ian, January 2010
link Click here to see other fixes for Ariston A23 MFFI.