Hi......I have a Worcester 350 combi. Changed prv due to passing and boiler continuously cutting out on LP after running CH. Ran well for a day and now boiler appears to be running high again....subsequently prv feathering again.

Is there a simple reason (and solution) as to why the boiler pressure may be high?? Air?? Static pressure 1 bar

Many thanks

DaveJ, October 2008

could be your water top up valve is passing and letting in water. this will raise the pressure too high and the prv will do its thing. dont forget to top up the inhibitor if the prv is passing or yer rads will rust away!

chris the plumber, October 2008

is your filling loop disconected may be valves passing if not.

wullie smp, October 2008