Worcester combi boiler losing pressure quickly

ElenaSerena

Hello everybody,

My Worcester combi boiler is losing pressure at a dramatically fast pace. I had multiple plumbers over and they changed several components of the boiler and tested it - they seem to agree that the boiler is fine and there might be a leak under the floor.

We have tested the boiler by isolating the heating and pressure loss continues happening even in this scenario with the difference that it is slightly slower (but still dramatically quick - the pressure drops from 1.5 to 0 in ~ 1 hour when the heating is isolated and in ~20 minutes when the heating is connected).

When the heating is isolated and hot water is running pressure seems to be stable.

Any thoughts/ideas about the main source of the problem?

Thanks so much for your help - highly appreciated!

Elena

Doozergirl

It does sound like a significant water leak.
Did you do any DIY around the time that it started?

The man that did my flooring 18 months ago drilled through our main gas supply to the boiler. That was fun!

ElenaSerena

Thanks for answering to my post.

No, I am renting a ground floor flat and no work has been done in the flat around the time the problem started.

Alex1983

Looks like you know the problem, a leak under the floor. You only have two options, floors up and trace the leak or repipe the ground floor. If the ground floor is concrete a thermal imaging camera may find it.

1.5bar to zero is approximately 5 litres of water.

ElenaSerena

Thank you, Alex. Yes, floors will be up next week.

crazylady100

Did you find the leak? There are companies who can find water leaks without pulling up all the floors.