hi there,we have a static caravan with a worcester 240 boiler,when i went to turn on water supply from main stopcock it started filling the boiler without opening the filling loop it rose to 4 bar then starts coming out overflow .if you turn on cold tap the pressure goes down to about 2.5 but then rises to 4 again when closed.also when you turn on hot tap sometimes antifreeze comes out ,this must be radiator water ,very strange