When the ovens have been on for any length of time there is a smokey smell from the cooker and the RCD at the consumer unit trips. Turning the cooker on after this continues tripping the RCD until the cooker is allowed to cool down. Even with the live supply disconnected the problem persists. Have tried to locate anything burnt or neutral earth fault but have had no luck as yet.
Any solution would be welcome.
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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.
The RCD unit works on an imbalance between active , neutral and the ground wire
the problem can be as simple as a moist connection, insect across terminals , wet dust , grease
the test is done by an accredited electrician using a correct meter to check insulation, wiring installation , elements and controls
you have done your best , now it is time to get it done safely
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;
The clue will be when the rcd trips out. If everything is switched off on the cooker with the exception of the clock when you power it up and then it trips out, it could be in the wiring to the oven from the control switch and or the wiring in the oven. The only way you are going to find this is to take the oven out of the housing and test the wiring, isolating components until you find the problem.