Everything is fine when i first switcj on the oven
Everything is fine when i first switch on the oven but as it warms up it trips the main RCD, however its individual switch on the fuse board remains on. You can reset the power and everything is fine til the next time the oven is used from cold
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I take it this will be an electric oven. If so the likely hood is that the oven element has blown and will need replacing. Normally when elements short they will trip the houses RCD (once only normally)
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.
I have a u1421 with the same problem! I notice the fan doesnt run too well, sometimes it doesnt run at all, needs a prod to get it running. I suspect with no fan, that the element gets far too hot, and then starts to leak to earth, tripping the RCD. I'm gonna try buying a new fan motor - you should ckeck if your fan is running full speed OK.
It might be that the breaker is overloaded and it's no longer supporting the load of all the appliances together.If you do not want to change your breaker you can still use your oven by switching off other appliances that is running while you are using the oven
I suspect not the oven element at fault. you only way forward is to actually test the resistance of the element to earth with a megga if you can beg the use of one. be cautious about the result as on occasion, elements are only faulty to earth when hot. another way to test if you are cdarefull, is to connect the element to mains independently of the oven and see if the rcd trips