santontp 150 unvented cylinder All aspects of plumbing questions and answers, help, tips and information

[alanfromleeds]

cylinder has water venting to over flowing have changed 6 bar pressure relief valve cartridge and at first this stopped water overflow but next day it was running again what else could it be there is a pressure reducing valve and a temperature relief valve also

[htg engineer]

What's the water temperature like? is it just dripping?

I know you say you have changed the PRV cartridge, do you mean the whole PRV or just the inner parts? if the latter it could be debri in the seating you'd be best changing the whole PRV