Cheers Mario.
From what you wrote, I take it that these things are not designed to be reset. All I know is that when I try to top up the CH system, the water simply goes straight through to the overflow; I haven't tried to remove the PRV from the boiler yet.
Just wanted to know what...
When refilling my CH system I managed to overpressurise the boiler by leaving the fresh water top up valve open too long while I was going round checking all the radiators for leaks etc; stupid, I know! :oops:
The CH pressure relief valve now simply discharges all water through the overflow...