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how can i fix my sime format 80 ?

pressure keeps dropping to zero. have bled all rads, noair in system. pressurised system back up to 1.5 bar but pressure drops down within 5 mins to zero. no signs of any water leaks.
martin., October 2008
have you checked the overpressure outlet outside?

mick, October 2008
link Click here to see other fixes for Sime.