IDEAL WRS 450 BOILER

process of ilimination. replace 3amp fuse & keep boiler turned off. turn boiler stat off. turn on hot water c if blows. if not turn on htg c if blows if not turn on boiler c if blows
 
Or get an electrical multimeter and find the short circuit or connection to earth from the wiring centre.
 
Statistically I find its the pump or a wet motor valve.

A professionals technique can be to put in a 13A fuse to "blow" the faulty item but this cannot be recommended to DIYers!

Tony
 

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