Central Heating so Noisy

manorpurl

Dear all,
I am really tired of the radiators in my house making so much noise. We have a 1 year old baby who keeps waking up due to all the thudding, banging noises. The central heating system is very old and we are thinking of replacing it in spring time, but until then i was wondering what i can do to minimise the noise. I got system powerflushed 2 years ago. Last year when i bled the radiators, the water colour was normal (not black). I know for sure there is some pipework that may be loose, but these noises are coming from the radiators and sometimes from the hot water tank. Also, the hammering seems to travel from one radiator to another in a circular fashion very quickly. Guys, please can you enlighten me as to how to fix these issues.
Can it be the pump? Do i need to bleed radiators again? Could it be the system is too hot (need to reduce the temperature on the boiler thermoststat)?
Thanks

casper_g

Re. the noisy hot water cylinder, our used to do this and eventually I noticed there was a bleed valve on top of a pipe near the cylinder. That did the trick for us.

The noise in the central heating system is not likely to be from the pump as far as I can tell. If the pump were noisy, the noise could carry through the house and be heard coming from the pipes/radiators, but you'd surely hear it from all of them at once. If the noise is from different radiators at different times I doubt that's the cause.

manorpurl

Thank you sir for your quick response,
when i bleed the radiators as well as the bleed value on the top of the pipe near the cylinder, does the CH need to be switched off? How best to make sure there is no air in the system?

mrtobs

hi there,
we have a loud 'buzzing' noise coming from a couple of our radiators sometimes, which stops if we turn them up/down. Having it all checked out/serviced but was told over the phone that it was probably just a thermostat on the radiator, which (if it was) could be fairly easily sorted & wasn't anything to worry about. Wouldn't describe it as 'hammering' though, so might not be the same as you're experiencing - thought worth mentioning though, just in case!

sdd7677

I think you are in the similar situation as mine. I got 2 month old baby wake up with the central heating noise all the time and I think noise (which comes on intermitently) coming down from the floorboard from the one of the bedroom (which echoed to other bedroom radiator too !!). I have called up plumber to have a look tomorrow.

ormus

could be an airlock in the system.
you can fit an automatic air vent valve into it. about 5/6 quid.

http://www.toolstation.com/shop/Plumbing/Valves/d20/sd2696


ps
if your system is the old gravity type then make sure your return pipe to the ex tank is high enough. air can get into the sytem if the pipe bends over too soon.