I assume you mean if the main electrical isolation is switched to on , the grill/ upper oven heats up even though the grill / upper oven switch is correctly set to off ......if this is the case you require a replacement thermostat for the upper oven I believe these are now obsolete and the alternative comes as a kit part no. 012959401 to modify the wiring replace both upper and lower oven thermostats see instructions attached
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