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My Saunier Duval F240E boiler tripped the ECD on the consumer unit?

The ECD was tripped on my electrical consumer unit. I unplugged everything and narrowed it down to the combi boiler. As soon as I switch it on it trips the ECD. what might be wrong?
mac plym, November 2009
water pump for a guess

b, November 2009
link Click here to see other fixes for Saunier Duval F240E.