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why does my boiler trip the rcd when its switched on ?

why does my boiler trip the rcd when its turned on .. i had noticed that the cofi transformer had some water on it could this be the problem ,it is a gah thermecon 60/80 oil boiler .
20rhart, February 2011
this is usually the pump but with out seeing the boiler i could not say for certain

shaun154, February 2011
link Click here to see other fixes for Gah Thermecon 60/80.