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I HAVE TO RUN 2 TAPS TO GET MY BRITTONY IIT TO FIRE UP WHAT COULD THIS BE? ?

COULD IT BE A FLOW SWITCH INSIDE?
D WHITEHOUSE PLUMBING AND HEATING, September 2009
probably the dhw flow switch, easy to replace, it's just a magnetic switch that unplugs and unscrews.

Ian, September 2009
Check flow pipe size into boiler maybe too small

izzy, September 2009