The boiler is a Baxi.
The noise is there for the whole time that the water and heating are on. it started 3 days ago. It sounds like a big cauldron bubbling!
Please help! We were woken a few days ago by loud noises from the airing cupboard. It sounds like water being dropped into the tank from a great height. Coincidence perhaps, I'm not sure, but our boiler downstairs then stopped working and we have just had a new motor fitted. The noise from...