Hi all. I recently replaced a PRV as the old one was blocked (?). All well at first but now 2 days later we have no pressure again. Airlock? Any ideas? We have an indirect cylinder, house built 6 years ago and no problems with plumbing until now. Help appreciated. Peter F

Could it be the original one was not blocked and you still have the same intermittent problem elsewhere?

Are we talking unvented cylinder or something else?

 

Has the prv got a filter upstream that is blocked?

 

Has you expansion vessel lost it's charge pressure, should be at 3 bar?

 

Is it external issue not related to the house?

Do you have a pressure gauge on the I coming supply? If you have a PRV, you should have one upstream and one downstream.

 

Is both hot and cold affected?

 

Does it vary across the day?

 

How are your neighbours supplies?

 

 

 

 

(My money is on a burst incoming supply pipe- on that topic, locate your meter box, flip the lid, see what the dial is doing)

 

 

Edited December 14, 20232 yr by Conor

Thanks for replies so far. To answer all of your queries- unvented cylinder, don’t have gauge at the moment-still on the old one (but new PRV labelled 3bar), blew into old PRV and was blocked-new one nothing, not checked with neighbours yet or expansion tank. UPDATE. Pressure now back, really weird. Fingers crossed! Maybe mains went low but something of a coincidence. Thanks again, PF