Save energy and money by repairing common boiler problems with our boiler tips

9 common boiler faults & problems

While we rely on our boilers to provide us with hot water everyday and to heat our homes whenever it’s cold, little thought goes into how they work.

Although the average homeowner doesn’t need to know what’s going on beneath the surface, they do need to regularly maintain their boiler to ensure its efficiency.


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Here are nine of the most common faults:


1. No heat or hot water 

Perhaps the most frustrating problem, you may experience a lack of heat or hot water due to valve failure, airlocks, a faulty thermostat or low water levels.


2. Leaking and dripping

Whether it’s a loose connection, high water pressure or a faulty part there are several problems that could cause your boiler to leak.


3. Whistling and banging noises 

The tell-tale sign of something called kettling, where limescale builds up in the heat exchanger, strange noises such as whistling, gurgling and banging can also be attributed to low water pressure or pump failure.


4. Pilot light goes out

Most likely due to a broken thermocouple, a device that responds to temperature. The pilot light can also be blown out due to damaged seals or a deposit build up.


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5. Losing pressure 

Common reasons for a loss of pressure include a damaged pressure relief valve or a leak somewhere within your central heating system.


6. Frozen condensate pipe

If your boiler’s displaying a fault code and it’s been particularly cold try resetting your boiler. If it remains unresponsive it’s possible that your condensate pipe has frozen.


7. Radiators not getting hot 

One of the top signs of a faulty boiler, radiators can stop working for a number of reasons. If there’s air in your radiators you can fix this by bleeding them.

If this doesn’t solve the problem you may have a broken pump or a blockage (sludge) in your pipes preventing hot water being circulated.


8. Boiler keeps switching itself off 

There can be numerous reasons for this including low water pressure, a problem with the thermostat, frozen condensate pipes, or an issue with the supply of gas, water, electricity or oil. This could also be due to air in the system or a faulty pump.


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9. Heating not coming on or turning off at the scheduled time

Whether your heating doesn’t come on at the scheduled time, turns off without warning or doesn’t reach the specified temperature it’s likely to be caused by an old or faulty thermostat. 

If you need assistance with your boiler, contact your local Gas Safe registered engineer.

Information and other materials on this website are not intended to constitute professional advice and should not be relied upon. Please see our Terms of Use for further details.

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