Stoves720Ef oven cooling fan resistor blew when replaced it blew again and cooling fan now burnt out. What caused this?

SOURCE: I have a Stoves 720

Try espares. If the part is not listed, there is a contact on the website to obtain a quote for a part. Of course once you have the part number you can try elsewhere.

SOURCE: Our top oven inner door

Try espares. If the part is not listed, there is a section where you can leave your requirements and they will get back to you.

SOURCE: Model 720EF. Model No

First things first. The top oven lights ONLY come on when the top oven is switched on. Operating the grill DOES NOT turn the lights on. If you wish to see what you are grilling, you have to turn the top oven control knob on to its first position as well as turning the grill on.
Secondly, the grill only works when the door is open. The grill does not work when you shut the door. When you open and shut the door, you should be able to hear the microswitch operating. It is located in the right hand side of the cooker, between the inner and outer panels - you cannot see it. I haven't seen the switch first hand but they normally come with an arm that contacts the door mechanism and the door mechanism operating, causes the arm to move, which causes a button on the switch to move and make the circuit. It has been known for the arm on the microswitch to bend with use so it no longer works correctly.
If you have checked all above and you hear the switch operating, then it could have failed. They are quite common, so if you can't get one from STOVES, try espares or someone like Maplin or RadioSpares.
The get to the microswitch you have to take the oven out of the housing and then take the right hand panel off. You should then be able to see it and check its operation.
All the best