Why is My Boiler Making Noises? - AMW Heating
Boiler Repair Bristol Noises

Why is My Boiler Making Noises? And What Can I Do About It?

Is your gas boiler making noises? Strange gurgling or whistling? It is understandable to be concerned. These sounds can range from minor hums to loud bangs, and each type of noise can indicate different issues. Here’s a breakdown of some of the common noises a boiler can make, the possible reasons, and what you can do about them.

What you hear:

My Boiler is Making a Whistling Sound?

This is known as kettling as it sounds like a kettle boiling and is typically caused by limescale buildup on the heat exchanger. This buildup restricts water flow and causes the water to overheat, forming steam bubbles that make a loud banging or popping noise. Kettling can also occur if the water pressure is too low or if the thermostat is faulty.

If you suspect kettling, you should have a professional descale your boiler and inspect for other potential issues like low water pressure or a faulty thermostat. An annual service can help identify limescale buildup and remove it before it becomes a problem.

My Boiler Makes One Loud Bang?

A single loud bang when the boiler fires up is often due to delayed ignition. This happens when gas builds up in the combustion chamber because it isn’t ignited immediately. When it finally ignites, it causes a mini-explosion. Common causes of delayed ignition include insufficient gas, inadequate air supply, dirty burners, or a faulty gas pilot light.

For delayed ignition issues, it’s crucial to call a professional immediately. Ignoring this problem can lead to more severe damage, such as a cracked heat exchanger, which is costly to repair and can cause carbon monoxide leaks.

My Boiler Making Noises Like a Continual Banging?

This is known as water hammer and it occurs when water flow is abruptly stopped or changed direction, causing a loud bang or hammering noise. This can be due to high water pressure, poor pipe support, or a sudden closure of a valve.

To fix water hammer, ensure your pipes are securely fastened and consider installing a water hammer arrestor. Adjusting the water pressure to the recommended level can also help. You can also drain the air chamber: turn your water off at the mains and open the highest tap in your home and then the lowest tap. This should allow the air chamber to fill with air again.

My Boiler Is Making Gurgling noises?

You might have air trapped in the heating system. This can cause gurgling or banging noises as it moves through the pipes and radiators.

Bleeding the radiators can often resolve this issue. If air is trapped in your system, bleeding the radiators can release it and eliminate the noise. This is a simple process that can be done using a radiator key.

My Boiler Making Noises That Sound Like Clicking or Tapping?

This is most likely to be ignition failure. Your boiler is struggling to fire up and much like your gas oven or gas hob, the igniter is repeatedly clicking as it attempts to ignite.

This could be related to the gas supply to your property and you should call a Gas Safe registered engineer to investigate and resolve the issue.

Professional Heating Engineer Help for My Boiler Making Noises

For most boiler noise issues, especially those involving potential gas leaks or complex mechanical problems, it’s best to consult a professional. Regular servicing can prevent many common problems and ensure your boiler runs efficiently and safely.

By understanding these common issues and knowing what steps to take, you can keep your boiler in good working order and avoid the stress and potential danger of a noisy boiler.

For any queries about the strange noises that your boiler is making or to make an appointment with one of our Gas Safe registered engineers, please call us on 0117 990 2735 or contact us here