Hi, check loose connections at board , particularly make sure in comming cables to RCD are in the 'stirrups' not behind. try to pull them out Power off at house!!!terms can be tight but missing the cables totally!
only other thing to check without getting current clamp meter to check over load is to confirm polarity, especially if RCD has small White earth lead they don't like it up 'em the wrong way, deary!!
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