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It trips the electrics
It trips the breaker
Unplug the machine and leave it unplugged. A machine that trips a breaker or safety switch has current leaking to earth: a cracked heating element, water on a live connection, damaged wiring or a failed board.
A retailer's general method is to test with a meter from each heater terminal to the boiler body. We read only its summary, so this guide gives no steps. Take the machine to a service centre authorised by Gaggia.