99% of the time it's used in fan mode (where the element used is within the fan).
Just went to use it in a different mode where top and bottom elements used, but not fan, it had been heating up for a couple of minutes then tripped the RCD in its half of the CU.
Hoped it was a one-off, so reset and tried again, tripped again, wondered if the internal light was causing it so removed bulb, still tripped.
Each time after resetting RCD have to prod the timer button to "ack" the mains failure, then the electronics are on (i.e. clock flashes) if the main selector knob is "off", it doesn't trip.
If I turn temperature knob to coldest, I can turn the selector knob to the setting where just the internal light is on, it doesn't trip (a small cooling fan also runs)
Leaving selector knob in the internal light setting (i.e. no elements or main fan) then turning up the temperature knob it trips the RCD as soon as I hear the stat click on.
To me that doesn't scream "earth leaky element" but rather "gunge has got into stat or across some wiring"