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Everything works fine when you flip which switch back on?
When you switch the breaker back on or the coffee machine back on?It could be the in-rush of the unit tripping the breaker (heating element firing up and drawing lots of current when it starts), or it could be an earth fault (current leaking from line or neutral to earth).
If it was line to earth fault, I’d imagine the coffee machine wouldn’t work at all.Water ingress could give you a fault that would trip an RCD but not MCB.
Heating elements are usually the things to go - something corrodes and lets water in or insulation fails and live parts touch earthed metal parts.
Nef
Fusebox has started tripping when I turn the coffee machine (think it's 2.8kw) on in the past week or so; when I flip the switch back on everything works fine, though. Not sure what the issue could be?