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, there is loud banging and after a minute, steam starts to vent from the top of the boiler. Obviously, I switch it off immediately, I leave it to settle, the pressure slowly drops back to 1.0 bar, I switch on again and it runs perfectly.
Can anybody help?
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, there is loud banging and after a minute, steam starts to vent from the top of the boiler. Obviously, I switch it off immediately, I leave it to settle, the pressure slowly drops back to 1.0 bar, I switch on again and it runs perfectly.
Can anybody help?