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pump is set at 3 - Is that about right? (highest setting) Will get installer to check the water and look at the expansion and feed pipes. I know it is hard to say but is this installation dangerous as it is now?Really don't like the sound it makes.

Thanks Darren, Magnet doesn't stick to the cold feed. Boiler is being moved on Monday(just into a new cupboard about a metre to the left) I will get the guy to add a cleaner to the system when he does it. Will I see if it is sludge causing it when he drains the system? There don't seem...

Oh - and I don't think it's on startup. Boiler is normally running and then changes tone/makes the noise.

Thanks for the quick replies! Hi Gasman, It is the hot water cylinder in my son's bedroom. I will try a magnet on the cold water feed into the hot water tank. Craig Hi Darren, The boiler was installed around 2003. The hot water tank has a dual coil (gas + solar panel) The...

Please can someone help me. We have a Potterton Suprima 100L Boiler mounted in our kitchen downstairs. I know these boilers have problems with locking out due to pcb but but I think my problem is slightly different. Approx 1-2 times a week the boiler starts making a scary pressurising...