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How can i fix my worcester 24si II?

Why does my boiler take 3 to 4 attempts to fire up from cold, when its hot it fires up 1st time and the hot water works fine when cold its just the heating.
Rich, December 2009
pressure gauge reads almost zero each morning but no apparent leak from any radiator or release from over flow external pipe.
Takes about 2 pints of water from loop to build pressure correctly on the gauge.

Marky c, June 2017
link Click here to see other fixes for Worcester Bosch 24Si II.