It is important to maintain constant water pressure in the boiler in order to ensure that it works as efficiently as possible. Also, low pressure in a boiler is an indication that not everything is right with the system and therefore, it is important for you to find the root cause of the low pressure.
First and foremost, you need to understand that two of the most common causes of low boiler pressure include bleeding radiators and water leaks. However, it does not mean that these are the only two causes that can lead to low boiler pressure. If you fix these two issues and still the boiler pressure remains low, it means that you need to call in a heating service engineer and let them check the system to find out the root cause.
A low boiler pressure is indicated by the pressure gauge on the boiler. If the pressure gauge indicates less than one bar, it typically means that pressure is low due to lost water from the system. The water is lost due to water leaks. It’s not easy to find leaks in the boiler, pipes or radiators but you can take a look around in order to find damp patches.
It is important that you never open the boiler to look inside for leaks. You should always call a gas safe registered engineer to take a look at the boiler in case you are unable to find any water leaks. Another reason for the low boiler pressure is bleeding radiators. A bleeding radiator releases air which results in lower pressure in the system.
If you are sure that the pressure drop in the boiler is not due to a leak or if the leak has been fixed, the boiler can be pressurised to bring it back to the normal level. It’s not that difficult to do and usually, the instructions are there on the back of the boiler. It is important that you re-pressurise the boiler only if you know what you are doing and completely understand the instructions. In case you have any doubts regarding the instructions, you should call in a gas safe registered engineer in order to check the system and re-pressurise the boiler.
Overall, you should detect the cause of low pressure in the boiler and fix it before attempting to re-pressurise the boiler. It is recommended to call in a registered engineer if you have any doubts on how to fix the leaks or how to re-pressurise the boiler once the leak has been fixed. Dealing with the boiler without proper tools and training can be dangerous.