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worcester 350 combi?

If I turn off the heating, I lose all pressure from the system and need to refill, otherwise I have to leave it on all the time. any ideas to what is causing it.
thanks
Ken, April 2009
check the pressure in the expansion and pressure release valve operation

STE, April 2009
is it leaking outside from overflow?

Ben, April 2009
Sorry Just to add I have a slow flow rate

ken, April 2009
link Click here to see other fixes for Worcester 350 combi.