A boiler that repeatedly loses pressure can be frustrating, particularly when the colder months are approaching. Parsons & Sons Heating and Plumbing explains some of the common reasons a boiler may lose pressure and when homeowners should seek professional help.
One potential cause is a water leak within the heating system. Even a small leak from a radiator, pipework or the boiler itself can gradually reduce system pressure. Damp patches, dripping connections or unexplained water around the heating system can be warning signs.
Another possibility is a problem with the boiler's pressure relief valve. If the valve is allowing water to escape when it shouldn't, pressure can repeatedly drop. This is something that should be inspected by a qualified heating professional.
Issues with the expansion vessel can also contribute to pressure fluctuations. This component helps accommodate changes in water pressure as the heating system warms up and cools down. If it is not functioning correctly, the boiler may struggle to maintain stable pressure.
Occasionally, pressure can drop after a heating system has been bled, as air and water levels within the system change.
While some boilers can be repressurised using the manufacturer's instructions, repeatedly topping up the pressure is not a permanent solution. Parsons & Sons Heating and Plumbing can investigate recurring pressure problems and identify the underlying cause, helping homeowners keep their heating system working reliably.
