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worcester 28 cdi c/h pressure prob?

hi i have a 28 cdi worcester combi. on the c/h side ...pressuer build-up after 10 min or so .rises from 1 bar to 3+ bar then of course pressure valve lets out side.
any help with this expansion problem? thanks...
alex., August 2007
thanks was low pressure in vessel,,, so far holding at 1 bar
thanks again///

alex, August 2007
pressure at o bar after heating is off . re fill to 1 bar heating back on then pressure up to ,3+ bar the valve lets again back to 0 bar ????

alex, August 2007
if pressure go's back down when heating is off then your expanssion vessel is low on pressure or is split.

hi-spec plumbing, August 2007
link Click here to see other fixes for Worcester.