Hi, I have a valliant combi boiler at home (not sure how old it is - would guess over 5 yrs though) which on & off for the last 12 months is occasionally making a noise that sounds like a trombone being played (badly).
It seems to happen about 10 mins after the heating goes off, the pressure is usually ok - around 1 - 1.5 and the only way of stopping it is to open the hot water tap (but as soon as closed it starts again) or to open 1 of the taps leading to the boiler - the pressure goes sky high, the noise stops & my overflow starts dripping....
Any advice? My plumber doesnt seem to know whats causing it.
Thanks!
It seems to happen about 10 mins after the heating goes off, the pressure is usually ok - around 1 - 1.5 and the only way of stopping it is to open the hot water tap (but as soon as closed it starts again) or to open 1 of the taps leading to the boiler - the pressure goes sky high, the noise stops & my overflow starts dripping....
Any advice? My plumber doesnt seem to know whats causing it.
Thanks!
