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pump running but boiler not lighting ?

Green light on boiler panel flashing very fast pump appears to be running but boiler won't light switch power off then back on again boiler then works okay
r Benson, December 2014
What make ,could be water pressure Switch dirty ,is fan running may be fan jamming up spray WD40 on spindle

ltd, December 2014
link Click here to see other fixes for Worcester Bosch Greenstar.