How do I stop my combi boiler from losing pressure?

How do I stop my combi boiler from losing pressure?

How to Fix Low Boiler Pressure

1. Switch off your boiler.
2. Find your filling loop.
3. Check to see whether the filling loop hoses are securely attached.
4. Use a screwdriver to open the filling valves.
5. Close the filling valves when the pressure gauge reads 1.5 bar.
6. Switch the boiler back on.

What causes pressure to drop on combi boiler?

Your combi boiler can be losing pressure for a number of reasons. Pressure loss may be caused from a leak in the pressure relief valve, an issue in the expansion vessel, air in your system, or a leak in the heating pipework itself.

Why is my boiler slowly losing pressure?

A boiler that keeps losing pressure is therefore always cause for concern. There are two main problems that typically cause a loss of pressure – water escaping somewhere in the system or a failure of the expansion valve and resulting damage to the pressure relief valve.

How often should I need to top up the pressure in the heating system?

The pressure in a central heating system will usually need to be topped up only once or twice a year. If you find you have to repressurise your heating system more often, contact a heating engineer.

Is it normal for your boiler to lose pressure?

Why does a combi boiler keep losing pressure?

Another reason why your boiler keeps losing pressure may be the expansion vessel. On a combi boiler, this component is usually inside the boiler’s casing. Its purpose is to accommodate the expansion of the water when it’s heated. The expansion vessel consists of two internal compartments divided by a rubber diaphragm.

What happens when the air pressure in a boiler is too low?

If the air pressure inside the expansion vessel is too low, the system will have no way of accommodating the change in the water’s volume. Consequently, the water will discharge out of the system via the pressure release valve.

When do you know if your boiler needs to be replaced?

On most digital gauges, you’ll see a flashing pressure reading, if there’s a low (or high) pressure warning. If your boiler pressure reads less than 1 bar, it’s possible that you might have lost water from the system, which needs to be replaced. This is where that filling loop (or filling link) comes in again!

Why does my boiler lose pressure when I Bleed?

If you bled your radiators recently, you may have lost some pressure. That’s because, when you bleed a radiator, air is released, which lowers the pressure in your boiler system. 3. How can I check my boiler pressure? Usually, on the front of your boiler, you’ll find a water pressure gauge.