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I have a Ravenheat Combi. When the boiler starts up from cold, after about 10 secs, it starts to produce a very loud banging (boiling water). It then shuts off and steam vents from the pressure relief valve (the system pressure remains reasonably stable though at around 1.5 bar). After...

I would be very gratefull if someone can give me a clue as to what is wrong with my combi. It's a Ravenheat approx 8 yrs old. It's been a good boiler but recently, when the boiler switches on from very cold i.e. 1st thing in the morning, the pressure on the gauge rises from 1.0bar to 3.0 bar...