why does my heating system make a banging noise

Why does my central heating make a banging or knocking noise? Less common now than it was 20 years ago, central heating knocking or banging is still very annoying. There are three main causes of banging:
1. Air bubbles trapped in the water of your central heating system expanding and collapsing can cause clicking noise. The best way to solve this is to use a to release the air from the system. Turn your heating off, wait 10 minutes or so for the bubble to collect at the top of the radiators and then let it out with the key. You may have to do this a few time over the course of a few hours to get all the air out. P 2. As the pipes in your house heat up they will expand, this expansion causes the pipes to move and warp very slightly. If they are resting against something hard this slight movement will generate popping noises as the pipes expand against the surface of the object. If the object is aPpiecePof furniture then you can either move the furniture slightly or put a foam pad between them. Sometimes the noise comes from pipes that have been run through wooden joists, this can be very annoying to fix and may require you (ideally your plumber) to expand the hole that the pipes are in and then fill the gap with expanding foam. 3.


The most serious and least likely cause is boiler kettling, this happens in hard water areas where limescale builds in in the boiler's heat exchanging and constricts/blocks the flow of water. As the pressure builds up the water turns in to steam, when these steam bubbles collapse and turn back into water you get a rumbling/banging sound - to fix this you need to call out a heating engineer. , Is your boiler making a great deal of noise? ItБs difficult to contend with loud, consistent banging sounds when all you want is for your heating system to just serve its core purpose and warm your home. While heating systems can naturally make a low level of noise, loud banging sounds are an indicator that there is a problem Б and itБs usually a result of one of the following three issues: -Boiler Kettling Does the noise coming from your heating system sound like a kettle boiling except on a larger, louder scale? If so, it could be down to an issue fittingly called БkettlingБ. This issue is especially prevalent in hard water areas where limescale build-ups occur on the boiler s heat exchanger and constrict the flow of water.


When the water flow becomes trapped in the heat exchanger, it gets too hot and eventually expands which leads to the banging noise. How to fix a banging heating system due to kettling? should tackle as the system will need to be treated with a fit-for-purpose limescale removal solution or thoroughly cleaned depending on the severity of the issue. -Trapped Air When air bubbles get trapped in the water in your heating system, the subsequent expanding and collapsing from these air bubbles can cause a loud clicking noise. How to fix banging heating pipes due to trapped air? To resolve this issue, you will need to get aб radiator key and bleed the radiators. Turn your heating system off then wait approx. 15-20 minutes to allow the air bubbles to move to the top of your radiators. Take the radiator bleed key and release the air from the system. If required, repeat several times over the course of a couple of hours to release all of the trapped air, depending on the severity of the issue. -Expanded Pipes As the pipes in your heating system heat up, they expand.


This expansion can subsequently cause pipes to move ever so slightly. However, if the pipes are resting on a hard object or surface, even the slightest movement will result in banging noises as they expand. How to fix banging heating systems due to pipe expansion? If possible, put a foam pad between your pipes and the object/surface to minimise noise. If this does not resolve the issue, it may be the case that the pipes of your heating system are encapsulated in steel or timber joists. This is a more complex issue to resolve and requires the skills of a plumber to expand the joists that the pipes are sitting in and to surround the pipes with expanding foam. While the above three issues are the main culprits, there are several other factors which may be contributing to a banging noise Б incorrect installation or settings, fault thermostats or a broken/worn pump to name a few. If in doubt, call a registered plumber to resolve your issue. They offer the expertise and knowledge to quickly and effectively solve the issue and this shouldnБt be overlooked!

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