Could be as simple as knackered wiring on the stat. Many moons ago we had a
Belling which had some kind of cracked insulation on a wire.

Nothing lasts forever I guess.
Brian

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"ARW" wrote in message
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On 17/12/2017 14:08, Andy Burns wrote:
10+ year old Neff oven, just decided to trip RCD, no previous trouble.

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"

Thoughts?



Screams to me knackered element.

The stat has to be switching something.

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Adam