Boiler Making Banging Noise
Loud banging, kettling, or rumbling sounds coming from the boiler, particularly when the heating or hot water comes on.
What Is Causing This?
- 1Limescale build-up on the heat exchanger (kettling)
- 2Air trapped in the system
- 3Faulty pump or loose internal components
How Urgent Is This?
This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.
What Needs to Be Done
A Gas Safe registered engineer will inspect the boiler, descale the heat exchanger if needed, bleed the system, and check the pump and valves for faults.
How Much Will It Cost?
National average estimate
Labour: £85 – £200 | Materials: £30 – £178
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Ask a QuestionHow to Prevent This
Have your boiler serviced annually. Fit a scale reducer in hard water areas. Bleed radiators regularly to prevent air build-up.
Related Problems
The boiler pressure gauge keeps falling below 1 bar, causing the boiler to lock out or lose heating efficiency.
Banging, gurgling, ticking, or clicking sounds from radiators, pipes, or the boiler when the heating is running.
The boiler shows an error code, flashes a warning light, or simply will not ignite when heating or hot water is called for.
Other Gas Engineer Problems
The boiler pilot light repeatedly extinguishes, meaning the boiler will not fire up for heating or hot water.
A smell of gas (rotten eggs) inside the house, which could indicate a gas leak.
The boiler pressure gauge keeps falling below 1 bar, causing the boiler to lock out or lose heating efficiency.
The boiler shows an error code, flashes a warning light, or simply will not ignite when heating or hot water is called for.