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Replaced PRV and still leaking

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Discuss Replaced PRV and still leaking in the Plumbing Jobs | The Job-board area at Plumbers Forums

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Mary jones

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the PRV has been replaced twice in the past few months and this seems to cure the leak temporarily, however the leak is now worse and is clearly caused by a different problem. The pressure gauge rises quickly upto 3 bars, (we release the pressure manually) but then when the heating/water is off (boiler not running) it loses pressure to zero whilst it’s off. there is an expansion tank already fitted, this was replaced approx 7 years ago. Does it sound like the expansion tank needs replacing or could it be something else?
 
Who fitted the replacement PRVs twice?
You need a heating installer to take a look at it all and also service the boiler, whatever boiler it is.
Note the expansion vessel is supposed to be serviced at each service and certainly will not function properly, if at all, unless it gets checked fairly frequently
 
Mary jones said:
the PRV has been replaced twice in the past few months and this seems to cure the leak temporarily, however the leak is now worse and is clearly caused by a different problem. The pressure gauge rises quickly upto 3 bars, (we release the pressure manually) but then when the heating/water is off (boiler not running) it loses pressure to zero whilst it’s off. there is an expansion tank already fitted, this was replaced approx 7 years ago. Does it sound like the expansion tank needs replacing or could it be something else?
Click to expand...
When was the last time that the boiler was serviced? This should have been checked on the annual service if I’m honest.
 
First things first is the prv and expansion vessel inside the boiler? What boiler is it?
 
Any chance of a pic of the prv ?
 
Photo of PRV
It’s a potterton boiler

C0AB39D7-F913-4585-873B-EEEEB36C5F5F.jpeg


5B7F49F4-5120-4BC4-B669-4DD28F72CE9D.jpeg
 
Find the red Red expansion vessel
 
Yep sealed system

Red expansion tank needs looking at best get your boiler service guy to have a look at it
 
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