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you'll probably find that they've got an old fridge or fridge feezer and there is a fault on it which is gradually building up.so sometimes the fridge is fine and other days it is not.you'll probably find that you don't pick up the fault even on a pat test. when the thermostat kicks in and then the motor or whatever starts to cool the fridge back down it draws more current and therefore trips the rcd/rccb.change the fridge is the best way.