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It's fine. I really appreciate your help so far. Cheers.

Iam not sure about the valve. I assume that it does have one. It's a wall-mounted combi. I know there is a split valve with a diaphragm for hot water and a diaphragm for the heating. Sorry I am not being much use.

Got a sink of boiling water in the kitchen now with no issues. Yet, when tried to run a bath upstairs the noise re-occurred and the boiler switched itself off (pin popped out).

NO. The boiler behaves differently. Flames are larger and temp. is a constant 60.

Hi Actually, the flames reduce in size when there is a demand for hot water. Incidentally, when the hot water tap is runnig the temp guage shoots up from 60 degrees to in excess of 130. Thank you for replying.

Hi I have a Biasi Prisma Boiler, apporximately 7 years old. It has many faults over the years and the latest has me completely stumped. Having only just replaced the fan less than 12 months ago, I now have an issue wherein we have no hot water. When I turn on a hot tap upstairs, even at...