Why does my boiler
keep losing pressure?
Most modern boilers run a sealed heating system that needs to hold its pressure. If you're topping it up every few days or weeks, water is escaping somewhere.
Check the pressure gauge
Your boiler's manual tells you the normal pressure range when the heating is cold. Repressurise only as the manufacturer's instructions describe. If it drops again, there's a cause to find.
Look for leaks you can see
Check around radiator valves, under the boiler, and along any pipework you can reach for drips, stains, white or green crusting, or damp patches on ceilings and floors.
Recently bled the radiators?
Bleeding radiators lets air out — and the pressure drops with it. A one-off drop after bleeding is normal; a repeated drop is not.
When it's worth getting help
If you can't find the leak, it may be under a floor or behind a wall. Finding and fixing it early stops damage to ceilings and floors, and stops you topping up every week. Leave anything inside the boiler casing to a qualified engineer.
Losing pressure, leaking pipework under the boiler, valves and pumps — the water side of your boiler, sorted.
Boiler losing
pressure again?
Ring for a straight answer, or send the details and a photo of the pipework under the boiler.