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Boiler doesn't fire up when calling for hot water. Ferroli Modena 80e?

I turned water off to change a tap washer. Since turning water back on, the boiler will not fire up when I turn the hot tap on. The water will get hot if we have the heating on.The pressure does seem to have dropped.I have increased the pressure to 1.5 bar on the boiler.

Derek Sayers
May 2007
FerroliHeating, Home Heating SystemsHot Modena 80e
It sounds like the flow switch has got stuck this has an internal component that spins around has the water passes bye the pcb detects this and fires boiler

john
May 2007

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