Boiler Losing Pressure

Boiler Losing Pressure? Causes and Solutions

If your boiler keeps losing pressure, you’re not alone. Many homeowners experience this issue. The good news is, it’s often easy to diagnose and fix. In this article, we’ll explain the common reasons, how you can handle them, and when it’s time to seek help.

Why Is Boiler Pressure Important?

Boiler pressure keeps your heating system running efficiently. When it drops too low, your radiators may stop warming up, and you might lose hot water. Clearly, maintaining the correct pressure is essential for comfort and safety.

Common Reasons for Pressure Loss

There are several reasons why your boiler may lose pressure. Let’s explore the most common ones:

1. Leaks in the System

Leaks are the most common cause. Even a small drip from a pipe or radiator valve can lead to a steady loss of pressure over time. Check for damp patches, water stains, or pooling water around your system.

2. Bleeding Radiators

Have you bled your radiators recently? While this removes trapped air and helps heating performance, it can also lower the pressure slightly. After bleeding, it’s normal to need a quick top-up.

3. Faulty Pressure Relief Valve

The pressure relief valve protects your system by releasing water if pressure gets too high. If it malfunctions, it may release water even when not needed, causing pressure loss.

4. Expansion Vessel Problems

The expansion vessel helps maintain stable pressure. If its internal air charge is low, the system can lose pressure as water expands and contracts.

How to Repressurise Your Boiler

Most modern boilers allow homeowners to top up the pressure easily. Before you begin, always check your manufacturer’s guide. Usually, you can follow these simple steps:

1. Switch off the boiler and let it cool.
2. Locate the filling loop (usually a silver braided hose under the boiler).
3. Open the valves slowly to let water into the system.
4. Watch the pressure gauge and close the valves when it reaches 1.0 – 1.5 bar.
5. Turn the boiler back on and check for normal operation.

When to Call a Professional

While some causes of low pressure are simple, others may need expert attention. If you notice frequent pressure drops, leaks you can’t locate, or constant faults, it’s best to call a qualified heating engineer. They can safely diagnose and repair the issue, ensuring your boiler runs smoothly.

Preventing Future Pressure Loss

Regular boiler servicing can catch problems early. Annual maintenance keeps your system efficient, safe, and less likely to experience pressure issues. Prevention is always better than cure.

Need Help? Contact Plumble Today

If your boiler keeps losing pressure, don’t let the problem linger. Plumble offers professional boiler repair and servicing across Kent. Our experienced engineers are ready to help you get your heating back on track. Contact us today for fast, friendly service.