I don't have a ladder that high - and even if I had one I would be scared at 8m to be frank :)
How do I check the condensate drain? that goes into a pipe. I would need to undo that somehow..
not more than a few drops outside (which I guess wouldn't cause such a fast drop in pressure)
and we can't see any leak in the house anywhere
ALSO
if I run the boiler as normal, the pressure goes up to 3.5-4 level...
I'm wondering if the expansion vessel broke down first and then that led to...
I have a Viessman Vitodens 100-w which keeps losing pressure even when the device is completely turned off.
If I top it up to 1 bar pressure, within about 20 mins it goes down to 0.5 bar and stabilises at that level.
There is no sign of water leak anywhere in or around the boiler or the house...
does the pressure shown on the boiler pressure gauge also affect the pressure on radiator pipes around the house? I'm wondering if high pressure that I see on the boiler could cause an underfloor radiator pipe to burst..
i think changing that costs as much as a new boiler
could auto air vent have anything to do with this btw?
maybe I should try getting the vessel and prv replaced first.. i don't know where to start or who could do this without costing a huge sum... prv is so hard to reach. they would have to...
there is no sign of any leakage inside the boiler or leak from us to downstairs or around the radiators.. also the PRV isn't dripping anything out
we don't know what is causing the slow drop on the pressure..
i'm totally lost...
but what I'm saying is the pressure goes down even when the boiler is off...
if I turn it off and completely wait for it to cool down then if I top up the water all the way to 1.5 bar.. after a few hours it would be around 0.7 bar. without the boiler working at all.
pressure was being lost after his visit yes - but at a very slow speed. around 0.05 bar an hour. now it seems to go down faster..
unfortunately can't tie anything around the PRV pipe outside as it is upstairs and outside the building. maybe a bucket underneath where I expect it to drip but in...
also - even with the boiler turned off -the pressure slowly goes down to below 0.5 bar
if the PRV only operates above 3 then why would the pressure keep going down. also I can't see any water coming out either.
but the expansion vessel has been checked and it was ok... what could be wrong with it?
the serviceman checked whether it could hold the pressure stable and it did. there wasn't any excess water in it either..
could it be anything other than the vessel?
Hi
I have a Viessman Vitodens 100-W combi boiler WB1B
If topped up to pressure 1 bar when turned off and cool, it goes down to about 0.4 bar after 1-2 hours. when it runs, it can properly heat up the radiators and provide hot water but the pressure keeps raising and rising and can sometimes go...