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Why is my boiler losing pressure?

It is common for the boiler pressure to go low however if it drops too low, most new boilers will automatically stop functioning. But what exactly could cause the pressure to drop?  There are a variety of causes, ranging from leaks to component failures, and in this blog, we go through them. 

why is my boiler losing pressure?

How to check the boiler pressure?

The pressure gauge to a screen on the boiler with an error code will give you an indication of whether the pressure is too high or too low.  For a boiler to perform effectively and safely, they need to run within a specified temperature range, which commonly falls between 0.7 and 2.5 bar. 

If the pressure falls below the permitted range on a regular basis, it may usually be replaced using a system valve. It is also very important to remember, that if your boiler has lost pressure, pumping it up the water will only be a temporary fix. 

Is this the first time your boiler has lost pressure?

Don't be alarmed if you awoke this morning to find your boiler has lost pressure for the first time.   Your boiler might lose water and hence pressure over time, even overnight. All that is required now is to repressurize the system by topping up the boiler.

causes of low boiler pressure

Why is my boiler losing pressure?


Trying to look for a leak in your home's heating system can be difficult to detect. The reason for this is that it could be anywhere between the piping, beneath the flooring, or in the walls. To find a leak, follow the plumbing throughout the home and search for any signs of dampness or mould. 

Seals may also deteriorate with time, so it's particularly necessary to examine around bends and junctions in pipes. If you discover a leak, contact one of our Gas Safe Engineers to reseal the system or, if required, re-pipe it.

Your boiler is old

Fixing a leak on a really old boiler may not actually be worth it. In this situation, you should consider replacing your boiler with a new, energy-efficient one. The reason for this is that older boilers are more prone to develop corrosion and severe limescale, causing not only additional difficulties but also reducing the efficiency of your system. 

Faulty parts

A fault code will most likely be shown on your boiler if it is losing pressure owing to a malfunctioning component. You should contact one of our heating engineers in Pulborough, Storrington and Billingshurst when you notice a fault code. We'll be able to figure out which part is broken and whether it needs fixing or replacing.

Damaged pump

A damaged pump is less effective and may have difficulty maintaining pressure. This should be addressed at your yearly boiler service check, however if pressure suddenly lowers, it might be due to the pump, simply speak to a qualified heating engineer to fix this issue. 

Speak with a heating engineer

Our heating engineers are based throughout Pulborough, Billingshurst and Storrington. Simply contact our team on 01903 740538 or 07871 725133 and we will be happy to help. 

To browse through our previous work, simply head over to our gallery page or if you are not sure why you should choose us for any boiler repair services, read through the reviews left by our customers by visiting the reviews page.