over the last few weeks i have noticed a rather dramatic pressure loss on my boiler system which is a vokera mynute 20e. i have a maintenace type agreement with my utility provider (hydro electric) and have had three visits from them in the last 10 days. of which they replaced a valve and fiddled about

on the last visit the said it must be a leak under my floor (solid wood) which i layed throughout my lower level and stated if there was a leak elsewhere it would have showed. the system pretty much keeps stable whilst powered on and hot water is running but when switched of it drops 1.5 bar every few hours

i did have my garage converted in the last year of which they said it was more than likely that which was the problem as the original radiator was relocated to do this. i have removed the solid floor from both sections which is ruined to find no evidence of the leak and after another visit i am told it must be somewhere else

i did try ferox sealer also to no avail as they recommended this as alternative although i have had to buy this myself and proved fruitless and the insurance company will neither replace floor or locate leak and tbh i am about at breaking point with this

the floor has no depth to check underneath and is pretty much a concrete slab with the radiator pipes clipped onto it foam insulation and two inch batton, chipboard and the wood flooring

i contacted a few companies that specialise in thermal leak detection but they want £500-600 for a 2hr survey which only is 90% successfull and i do not have the money for this

if anyone can throw me any ideas i would gladly appreciate it

thanks in advance for taking the time to read this

thank you for your reply

if i fill to 1.5bar cold it stays the same does not rise when heating on but runs pretty stable until when turned off when it takes a big drop over short space of time

Turn the boiler off, and pressure the system to 2bar, next turn the 2 heating pipe valves under the boiler off.

Leave overnight or for several hours, check the boiler pressure hasn't dropped, and turn the valves back on, if the pressure then drops you know it's the system that has a leak.

i have closed the valves and it has dropped half a bar in 30 mins

any suggestions please ???

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I assume you mean it dropped with the valves shut, if that is the case you have a leak in the boiler.

Check the condensate pipe to see if it is dripping/running with the boiler off.

If the boiler is dry inside then the valves can't be fully closed, unless the PRV is leaking.

Tie a plastic bag over the copper pipe that sticks through the wall to outside.

The first thing to do is check all the valves and everything above ground by simply running your finger around the fittings/pipe.

If that wasn't done they ain't done their job properly.

I had assumed you would have done that in any case.