Hi, Hope you can help.... I turned on the above oven yesterday and it caused the RCD to trip. I have since reset this and everything comes on but when I try either the top or bottom oven, the heat will not go above 100 degrees.
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The elements in ovens consist of an outer earthed metal tube and an inner resistive element that is insulated from the outer tube by what is effectively a compressed ceramic insulating powder. If the element is not used for a while, enough atmospheric moisture, (or from spills, etc), can penetrate the insulation to cause enough earth leakage to trip the RCD. If the RCD is tripping at the correct level, (They can get too sensitive - see this article here: Diagnosing RCD earth leakage breaker nuisance trips), then the only long term solution is to replace the element, although they can sometimes be dried out by heating them.
as an appliance engineer sometimes the oven element can be at fault, although this always the case, it could be the thermostat also as they are both interplay when the oven is heating up, they could both be tripping the RCD as the earth is detecting that electricity is becoming live due to a component leaking electricity.
you could try replacing both of them with caution (turning the electricity off in the house ect.. using safety equipment)
a good site to use for those components is the following;
It is quite possible that it is the oven or grill element that is causing the problem.
You need to test them with a meter, to determine if they are o/k.
If you have no meter, then disconnect each one in turn, and try it again, this should isolate the problem.
Hope this helps you.