Hi there i am pulling my hair out with this one i have a baxi 552 boile
the problem is i have 2 pipes run down the side of my fire place the make an awfull almost like kettling sound at anytime of the day, th heating does not have to be on for these to go off. I have drained th system, bled the radiators and also treated the system with fernox. th other pipes ie under the floorboards are fine and make no noise what s ever it is only the 2 that run down beside my fireplace. I have had a engineer come out and service the fire and he said that it was trape air in the system. I would be very greatfull to anyone with som suggestions on this case thank
-- bush1207