Boiler pressure loss can leave radiators cold and your home uncomfortable. In this post, you’ll learn what causes pressure to drop, how to check your system safely and when to call in a Gas Safe registered engineer for a lasting solution.
Common Reasons for Boiler Pressure Loss
Leaks in the Heating System
Even a tiny escape of water, from a corroded pipe joint, radiator valve or boiler casing, will cause pressure to drop over time. You may not see a puddle immediately, but tracking the gauge over a few days will reveal a steady fall if water is escaping somewhere in the loop.
Radiator Bleeding and Its Effects
Releasing trapped air from radiators is essential for efficient heating, but every time you open a bleed valve, pressure falls. As air vents out, water takes its place and the gauge reading dips. Always check and top up the system via the filling loop immediately afterwards to restore the correct cold-start pressure.
Pressure Relief Valve Malfunctions
Safety relief valves are designed to discharge excess water when pressure spikes, protecting your system. If the valve becomes worn, blocked or misaligned, it may let water escape even when pressure is within normal limits, triggering repeated losses that won’t correct themselves.
Corrosion and Sludge Build-Up
Over the years of use, mineral deposits and rust can form inside pipes and radiators, obstructing flow and placing extra strain on pumps and valves. This internal resistance can cause pressure fluctuations and persistent drops as the system struggles to maintain flow.
If topping up doesn’t hold pressure, or you spot corrosion, hear unusual noises or observe the safety valve operating frequently, it’s time to engage a Gas Safe registered engineer. They’ll perform leak tracing, replace faulty valves and power-flush to remove sludge, restoring safe and reliable operation.
Looking for year-round peace of mind with your boiler system in Bedford and Milton Keynes?
Fixbot Ltd offers expert maintenance, repairs and safety checks to keep your heating running smoothly. Call us on 01234 815101 or fill out our contact form to book a service today.
