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Common Plumbing Issues and Quick Fixes
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Topic starter
28/11/2024 2:58 pm
I turned on the central heating for the first time in a while, and I’ve noticed the boiler pressure is over 3 bar. The heating’s working fine, but I’m a bit worried it might cause a problem if it stays that high.
Could it be something simple like too much water in the system, or is it likely to be a bigger issue, like the expansion vessel? What’s the best way to bring the pressure down safely? Would really appreciate any advice – cheers!
28/11/2024 5:59 pm
3 bar is definitely too high – you’re right to be concerned. The first thing to check is whether the system’s been overfilled. Look for the filling loop (usually under the boiler) and make sure it’s closed tightly. Sometimes it gets left slightly open, which can raise the pressure.
If that’s not the issue, it could be the expansion vessel. When it’s faulty or loses pressure, there’s no room for the water to expand as it heats up, which pushes the pressure too high. You’ll need to get it checked and possibly recharged or replaced.
To bring the pressure down safely, you can bleed a radiator to release some water. Just make sure you’ve got a container ready to catch it. If the pressure keeps rising after that, it’s best to call a professional to take a proper look. Don’t leave it too long – high pressure can strain the boiler and cause damage.
29/11/2024 12:11 pm
Sounds like the system’s over-pressurised. First thing I’d do is check the filling loop – if it’s been left open even slightly, it’ll keep topping up water and push the pressure up. Make sure it’s fully closed.
If the filling loop’s fine, you can bleed a radiator to let some water out and bring the pressure back down. Just keep an eye on the pressure gauge while you’re doing it.
If it goes back up again after that, it’s probably the expansion vessel. Could be it’s lost pressure or needs replacing. Best to get someone in to check it out if you’re not sure. High pressure isn’t something you want to ignore – it could cause bigger issues with the boiler.
