Pressure loss on Worcester Bosch 24CDI RSF Combi

[TrevorUK2]

I have renewed AAV, PRV and topped up pressure vessel on my combi all in accordance with wiki. No leaks on system. Refilled to 1.5. Now have a pressure loss (although a small amount) through drip on new PRV. from 1.5 down to 1.3 in 7 days.
Hot water Ok and clean water.
Any ideas why pressure loss now.
Advice appreciated.
I am a retired plumbing and heating engineer.

 

[MikeyGas]

Trev, there should be no drip on a PRV no matter how small. This is where you are losing pressure from. You might have got a bit of dirt on the valve seat when fitting it. Best thing to do is open the PRV to let a bit of water out and see if it clears it and that the PRV re-seals correctly.

If it dosen't then will have to strip out and clean the PRV.

 

[TrevorUK2]

Thank you for responding so quickly.
I will try your suggestion, although I would not have expected dirt on the seating during fixing of the PRV, as I did not manipulated the PRV red knob when I installed it.
Pressure as been forced out of the PRV in the first place. Why I wonder?
Not sure how the initial over pressure resulted in actuating the PRV
Perhaps dirt got on when that happened, so your idea will hopefully do the trick re stopping drip and further pressure drop.
Thank you for your advice, it is very much appreciated.

 

[TrevorUK2]

I dont want to count my chickens , but trying your remedy to purge the PRV to clean the seating of dirt seems to have worked. Fingers crossed!!!
Thank you for your help. Much appreciated