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I lived in a house once where it did a similar noise. It was not the boiler though. It was the copper water pipes. They expanded when they got hot and contracted when they got cooler and the metal brackets they slipped through made that noise. If it really is the boiler, I have no clue.That did not help, did it?Karsten
Baxi Combi Boiler by any chance?
Quote from: Andrew K Fletcher on 06/01/2009 10:33:31Baxi Combi Boiler by any chance?Not one of those. An old version.Similar to this, but yellow and old!
Quote from: Seany on 06/01/2009 12:25:48Quote from: Andrew K Fletcher on 06/01/2009 10:33:31Baxi Combi Boiler by any chance?Not one of those. An old version.Similar to this, but yellow and old!But that's the hot water tank, Seany, not the boiler.
(Hi Seany, and welcome back)Could it be that the thermostat is not working properly, and the water is being overheated?
Quote from: sophiecentaur on 06/01/2009 13:34:55Quote from: Seany on 06/01/2009 12:25:48Quote from: Andrew K Fletcher on 06/01/2009 10:33:31Baxi Combi Boiler by any chance?Not one of those. An old version.Similar to this, but yellow and old!But that's the hot water tank, Seany, not the boiler.Takes an immersion heater by the look of it.
Is your internet transmitted wirelessly?
Quote from: Paul. on 06/01/2009 15:02:08(Hi Seany, and welcome back)Could it be that the thermostat is not working properly, and the water is being overheated?I seem to remember the plumber saying that was what was causing the air in our system to become blocked; or maybe it was the steam caused by that. It was about 20 years ago so I can't remember for certain except that he had to drain the system. What I do remember, though, was that it sounded like a horse in hobnail boots dancing on the pipes.
And can you relate this noise to my internet going down? Because every time it clangs, my internet goes down for a minute then comes back to life!Every time.. It's weird.!
Radio Frequency Interference.Electric motors can be strong sources of RFI.
Central heating pumps run for several minutes, if the pump motor was the source of the RFI your Wi-Fi link would also be down for several minutes.There is an electro-mechanical valve which is only activated momentarily (seconds) when the pump motor starts.So a faulty electro-mechanical valve could be the source of RFI and your momentary loss of Wi-Fi, (and the banging).
But they are very unlikely to cause RFI because there are breaking contacts in a simple induction motor.The same goes for the pump and fan (if the boiler has one). They are all 'shaded pole' type motors; inefficient and low powered but very reliable.
Does your HIFI make any odd sounds whilst this is happening?
Seany,Listen to me. Ignore all the above this is the real deal !Your central heating system has been infested by some Carribean Kettle Drum Plumbing Fairies !!As soon as the heating comes on they think it's time to partayyyyy !!!The way to cure this problem is to open up a radiator valve and play some Bob Marley...The Fairies will seek out the rhythmic notation and fly out. If ewe have a jar ready they will fly into it, ready for depositing through your neighbours letterbox !!Ewe won't see them because they are invisible but some rice and peas and a piece of coconut in the jar will keep them happy whilst in transport. You'll know when they have all arrived because if ewe put your ear close to the jar you should be able to hear them Jamming !It's worth knowing that for most people, they welcome this introuduction to the wonderful Jamaican culture as a welcome gift...and they soon enjoy the musicality and soothing laid back sounds that their central heating creates.
What if the valve driven by the motor was sticking (e.g. due to limescale) the motor would draw excessive current or could even burn out as a result.