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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
Heating, Home Heating SystemsPump Running Boiler
What make ,could be water pressure Switch dirty ,is fan running may be fan jamming up spray WD40 on spindle

ltd
December 2014

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Worcester boiler dripping water?

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Mend Home Heating Systems
Mend Heating, Home Heating Systems
Mend repair fix home heating systems