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How can i fix my 28cdi boiler the pressure is going up?

After I took out the air from a radiator, I found the pressure down and then i filled up afterward the pressure is going up little by little.
mitch, May 2010
your filling loop valve is letting water in it. Disconnect flexi pipe from valve and see it driping and leaving loose and see if pressure still building up than is expansion vessel not doing its job

k, May 2010
link Click here to see other fixes for Baxi 28CDI.