combi boiler losing pressure

[unfinishedsweet]

It's not easy to check the potential leaks but you could eventually find some discreet places to cut off the under concrete section of pipework to mess a bit with them, for instance fit two valves at the edges of the pipes, then screw a pressure gauge on one of them, then connect a mains to the second, fill the section with water, close the valve mains is connected to and watch the gauge if there is any loose or not. Bleed the rads and close their valves. You could eventually connect the gauge to a rad's valve, but it's harder to bleed the section. This solution would damage uncovered pipework aesthetics, cause you would have to connect the pipes again. Also you would have to be sure each section of under concrete pipework is isolated, the valves are closed etc. Not perfect, but always _some_ way to check for invisible leaks.

 

[ice cold]

Ice Cold - did you get a reply about this?

James T

After a couple of days of the pressure dropping to 0 and topping it up the problem seems to have gone away.

I'm guessing that as Mike said, there was some dirt on the PRV and it must have cleared itself. Don't know if this is a likely explanation, but I've checked the boiler and there hasn't been a drop in pressure since.

Thanks to all for advice and suggestions anyway.

 

[intergasman]

If Your PRV is ok and you have no leaks on the system test the pressure vessel on the boiler it might have lost it's charge.!!

 

[mike4369]

If Your PRV is ok and you have no leaks on the system test the pressure vessel on the boiler it might have lost it's charge.!!

I have a similar problem as descibed here ( posted as a separate thread) and will try the prv fix first - but to what pressure do you recharge the expansion vessel. My boiler = Ferroli F30 COMBI.

 

[mnad]

Hi Guys,

I have an Ariston Micro GENUS HE bolier (24months old) ... it seems to be losing pressure around 0.5bar every 6hours or so ....

iv been loking around for possible leaks without success ...

However there's a drip at the water Mains internal stopcock ... would that be a possible cause?