Why is my boiler making strange noises?

Have you ever been woken up in the middle of the night by the sound of a loud, banging sound coming from your boiler? If so, you're not alone; even modern units and heating systems sometimes produce strange noises even if they have newly been installed. Find out why this might be by reading this blog post.

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What does it mean if my boiler is making a whistling noise?

Trapped air is probably the most common boiler problem that is occasionally accompanied by another high-pitched whistling sound. Fortunately, in most cases, this problem is quite simple to resolve, especially if you notice cold patches on specific radiators around your home. To resolve this issue, just remove the trapped air by bleeding your radiators and monitoring the effect on boiler pressure. If this repair fails, you'll need to consult with a Gas Safe registered heating engineer, like one of ours here at J. Wheatley Gas to pinpoint the source of the noise and what caused the air to become trapped in the first place.

What if I have bled my radiators and I can still hear noises?

There is a chance that even after you have bled your radiators, you are still noticing strange sounds coming from your central heating system. If this is happening, your radiators may have built-up limescale accumulation, and this could have spread to the plumbing of your central heating. A central heating powerflush by a Gas Safe engineer would wash out the pipes and remove limescale deposits. 


There is also a possibility, that if you live in an area that has hard water, there has been limescale buildup as a result of the hard water in your plumbing. If you suspect limescale buildup is causing the noise, then we suggest that you should seek the advice and assistance of one of our central heating experts.

Why can I hear loud banging noises coming from my boiler?

Let's say that you have recently had your radiators powerflushed, yet you are still hearing strange noises coming from your boiler. This could still occur if your boiler's thermostat is set too high. If this is the case, it may cause loud banging noises in the copper pipes, which indicates that your boiler is overheating. If you have experienced this, we recommend that you lower the temperature of your thermostat to see if that helps solve the problem.