grill trips rcd

In the first instance I would be tempted to conduct an experiment replacing the thermostat with a normal switch (taking all safety precautions including making absolutely sure that the oven did not overheat!!!)
But just in case, make yourself a Neapolitan pizza ready to take advantage...
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As evrything works ok if the thermostat contacts are closed before the live is connected

But I thought you said that the RCD tripped when the thermostat re-opened? ie it was only OK while the thermostat was closed.

Have you tried the experiment yet?

Do rcd operating values change ?

Not as far as I am aware. You can use an RCD for calibration purposes over a period of time implying that it does not change.
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