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Swich on heating the pilot lights up then the boiler starts making banging noises the pressure gauge starts fluctuating and the boiler cuts out

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Hi you could be drawing air into the system try bleeding the system check all seals and if ok tighten all connections

Posted on Nov 17, 2009

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Posted on Jan 02, 2017

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Hi,
I have a ravenheat 820/20(t) boiler and the pilot will not say alight, I have 20mV from the thermocouple(through the safety switch) and its had a new gas valve fitted(good earth continuity).The heating system is holding pressure at 1.2 bar.
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yes tami
there should be a pressure rellief valve fitted.
it also sounds like the heat exchanger is blocked if the hot water is not as good as it used to be and the boiler reaches temperature too quickly then there is scale in the heat exchanger and needs to be cleaned or replaced

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