An expert has explained noises to watch out for coming from your boiler. (Image: Getty)
A plumbing expert has warned homeowners about boiler noises that shouldn’t be ignored.
Andy Kerr, the founder and CEO at BOXT, has told homeowners to be vigilant if their boiler starts making unfamiliar sounds, advising swift action to avert further mishaps.
While not all boiler racket is a red flag, Kerr highlights specific clamours to be wary of, noting: “Each comes with its reasons and remedies” – hissing, knocking, gurgling, and banging top the list.
He said: “Remember, never attempt to fix anything yourself if you are unsure. You should always call a professional if you’re in any doubt about the noises coming from your boiler.”
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These are boiler noises to watch out for (Image: Getty)
“Typically, the problems causing your boiler to make noise can be fixed quickly. But if your boiler is old and ready to be replaced, there’s a chance that the problem might be something a little more severe and, in these instances, it’s important to be aware that it might be time for a new boiler.”
Whistling/hissing/high-pitched sound
When it comes to a whistling, hissing, or high-pitched din, Kerr points to kettling as a potential culprit. This phenomenon occurs when water flow within the boiler decelerates, causing the water to superheat and boil, leading to the characteristic kettling sound, reports Wales Online.
Often, this issue stems from circulation woes, suggesting that water isn’t being pumped or circulated properly. Such symptoms could indicate a defective pump or broader central heating system troubles.
Kettling can be a significant issue that requires the attention of a Gas Safe engineer. Common causes include limescale build-up, a leaking boiler or system with an incorrect water level, a faulty thermostat causing the boiler to overheat, and a defective pump.
An expert has issued a warning over boiler noises (Image: Getty)
Knocking
If you notice a clicking or tapping sound, it could indicate that your boiler is having difficulty firing up. This could be due to ignition failure.
In such cases, it’s not advisable to attempt to fix the problem yourself. Instead, call a Gas Safe engineer as the issue could be related to the gas supply to your property.
Gurgling/dripping/bubbling
While there could be other reasons, a gurgling noise is typically caused by trapped air in your radiator. Sometimes, the gurgling sound from your boiler is merely the movement of hot water, so there’s no cause for concern.
However, if the sound persists and becomes more frequent, it’s advisable to check the following.
Bleed the radiator: The gurgling sound could originate from an appliance connected to the boiler, such as a radiator. After bleeding the radiator, check the boiler pressure and top it up if necessary.
A decrease in boiler pressure can lead to additional problems. If the noises persist, the problem lies elsewhere.
Check the water pressure: A low water pressure could be the culprit behind the gurgling noise. You can check this by looking at the pressure gauge in your boiler cupboard.
If the dial is in the red section, it indicates that the pressure is too low and your boiler needs repressurising.
These are boiler noises to watch out for. (Image: Getty)
Look for a frozen condensate pipe: This issue often arises during extremely cold weather when outdoor pipes can freeze. To resolve this, gently defrost the pipe with warm water.
If the problem continues, there might be another issue with the boiler. In such cases, consult a Gas Safe registered engineer who can help address the situation.
Banging sounds
A loud banging noise can originate from limescale buildup inside your heat exchanger, a malfunctioning boiler thermostat, or it could be something as simple as your thermostat being set incorrectly.
You may need to call a heating engineer who can inspect the temperatures of your flow and return pipes for overheating, and also verify if your boiler thermostat is set to its correct temperature. If neither of these are causing the issue, they may need to examine the pipework under your flooring to ensure it is clipped and supported correctly.
A Gas Safe registered engineer can also identify if the problem is emanating from your system circulation heat exchanger. In such a case, you may require a central heating system flush to rectify the problem if it is due to a buildup of magnetite, debris or dirt.
Buzzing sounds
A humming noise emanating from your boiler can be a cause for concern, and it’s advisable to seek professional assistance. A variety of issues could be at the root of this humming sound, ranging from malfunctioning electrical components to a jammed pump.
If your boiler is producing a humming or moaning sound, it’s crucial to pay attention. Essentially, this whining noise is your boiler’s cry for help.
It signifies an immediate need for repair, and you should enlist the services of a professional to handle it.
Whooshing noises akin to a washing machine
Combi boilers are particularly prone to producing whooshing sounds. These noises typically originate from a blocked circulation pump or trapped air within your system.
Upon hearing this sound, it’s recommended to consult with an engineer who can inspect for any blockages or trapped air and diagnose the issue accordingly.
Alarm-like sounds
An alarm-like sound from your boiler usually indicates that something is amiss. Common culprits include low water pressure, a malfunctioning thermostat, and blockages.
To troubleshoot your boiler, check the water pressure and the thermostat. If these components are functioning properly and the beeping continues, get in touch with a Gas Safe registered engineer.
