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35cdi worcester bosch?

only comes on when u press the boost button on central heating other wise hot water ok any sugestions why
gabber, January 2008
I'd start by replacing the clock/retrace the wiring of the clock has been appropriately installed before you buy a new clock. you never mentioned if your clock was wall-mounted or integral to the boiler itself on the fascia panel.

Gordon Ramsay, January 2008
link Click here to see other fixes for Worcester 35cdi.