Hi,

My boiler keeps losing pressure rapidly. I put it up to 2.5 bar and witin 2 hrs it had gone down to 0. When I top it up and turn the central heating in it loses 25% immediately and the decreases until it gets to 0. I've had a couple of plumbers in who have checked the boiler over and suggested it's a leak (there's nothing wrong with the boiler). Problem is I've got wood on the first floor- where we're sure the leak is. It's a suspended floor- wood on chipboard, then the pipes. So, the only way to get to the pipes is through the floor- which will prove costly. One plumber put leak sealer oin the system, which didn't work.
I checked the rads for leaks, by turning the central heating up. Found nothing, but one of the rads didn't heat up- should I make the assumption the leak is on a pipe connected to this?

I've seen a company which uses specialist equipment to find the leak and fix it- minimising damage to the floor (www.adileakdetection.co.uk). Has anyone got any experiance using a company like this? It would really kill me to shell out for this and have to rip the floor up anywyaa!

Any advice would really be gratefully received

Many Thanks

Thanks for the reply- I'm a complete numpty when it comes to plumbing/ boilers- where can i find the prv valve? It's a potterton gold...

Cheers

Information, plus makes and models help.

The boiler pressure should be no more than 1.5bar when cold.

I would guess subject to information the expansion vessel is duff or lost it's pre-charge.

Should be the first thing the plumber checks.