Why Is My Boiler Making a Noise, and How Do I Fix It?
If your boiler starts making a strange noise, there’s no need to panic. Boilers often make noises, and they’re often harmless. But it’s still important to identify the noise to determine what it is and if it needs fixing.
A technican fixing a boiler making banging noise
Some boiler noises can be fixed with a little DIY, while others might require the help of an engineer.
In this guide, we’ll walk you through:
- The common causes of boiler noises
- What different boiler sounds mean
- How to fix a noisy boiler
- When to call an engineer
- Common FAQs
What causes a boiler to make a noise?
Before we jump into troubleshooting your sound, it’s helpful to briefly understand what might be causing those strange noises. There are a few common reasons why your boiler might be making noise.
| Common issues | What it means |
| Air in the system | If there’s air trapped in the pipes or radiators, it can cause gurgling or whistling sounds. |
| Limescale buildup | In hard water areas, limescale can form inside the heat exchanger, leading to a kettling or whistling noise |
| Worn-out pump | A faulty pump can make a sound similar to aeroplane or a loud rumbling. |
| Loose parts and fittings | Loose brackets or other components can make a vibrating noise. |
| Overheating | If the system is overheating, it could cause banging or clunking sounds. |
Common boiler noises and how to fix them
Boilers are designed to make a little noise when they’re operating. However, certain sounds might suggest an issue with your boiler.
To help you determine what’s an issue (and what isn’t), here’s a breakdown of common noises your boiler might make – and what they really mean.
My boiler is making a vibrating noise
If your boiler is vibrating, it might be due to loose brackets or other fittings. This can usually be fixed by tightening the parts holding your boiler in place. However, if the sound continues (or if it seems like your boiler is physically shaking), we recommend you get an engineer to take a look.
My boiler is making a gurgling sound
Gurgling noises may indicate there’s air trapped in the system. This is quite common and can often be fixed by bleeding your radiators. If the noise continues, it could mean there’s a bigger issue like sludge buildup in the system. In this case, you’ll need a professional power flush to clear it.
My boiler is making a banging noise
A banging sound usually occurs when there’s a buildup of limescale or sludge inside the heat exchanger. This can restrict water flow and cause the system to overheat. Left untreated, it can damage the boiler, so it’s best to have it checked by an expert.
My boiler is making a noise like an aeroplane, is it dangerous?
If your boiler sounds like an airplane taking off, it could be a sign of a faulty pump. The pump circulates water through the system. When it’s malfunctioning, it can create a loud rumbling noise. Replacing or repairing the pump should fix this issue.
My boiler is making a whistling or kettling sound
Whistling (or kettling) is a common boiler noise that is also caused by a buildup of limescale in the heat exchanger. This usually happens in hard water areas where limescale forms more easily. If you notice this sound, it’s a good idea to have a professional power flush the system and install a magnetic filter to prevent further buildup.
When to call a professional boiler engineer
If you’re unsure about the cause of the noise, or if the problem persists after trying simple fixes, we recommend you call an engineer to take a look. Ignoring the issue could lead to bigger problems further down the line.
A noisy boiler can be concerning, but most of the time, it is a simple fix. At Add Heat, our expert engineers can diagnose the cause of the noise and take the necessary steps to repair your boiler if needed. If you’re concerned about your noisy boiler, don’t hesitate to get in touch.
We can also carry out an annual service to keep your boiler in top condition.
FAQs
Is it dangerous if my boiler is making a noise?
While most noises aren’t dangerous, it’s always a good idea to investigate the cause. Boilers are designed to shut down if there’s a serious issue, but leaving the problem unchecked could cause further damage.
How do I fix a noisy boiler?
Depending on the noise, you can try bleeding the radiators, tightening loose parts, or having the system flushed to remove sludge or limescale buildup. If the problem continues, it’s best to call in a professional.
What does a boiler sound like when it’s overheating?
If your boiler is overheating, it might make a high-pitched whistling or kettling sound. This is usually due to limescale buildup or a blockage in the system, which restricts water flow and causes the system to overheat.
Can a leaking pipe cause a noisy boiler?
Yes, a leaking pipe can lead to a drop in pressure. This may cause the boiler to make strange noises. If you suspect a leak, it’s important to get it checked.