Defy model MD0356 - Microwave Ovens

There are lots of models in the range, but it seems they all have a thermal fuse. See the link and the images tab.

https://www.google.com/search?q=defy+gemini+gourmet+multifunction+thermofan+double+oven+fuse+location

The correct search query would be

make (numerical model) thermal fuse location
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I put you in the right Category and Edited your question.

Only authorised service engineers have schematics to microwave ovens. The reason is that they are extremely dangerous to work on, super high voltage held in the capacitor, the poisonous core of the magnetron and the ability of microwaves to make you blind in 5 seconds. The case is fastened with safety screws for a reason.

Contact the company and ask them for the schematic. Tell them you want to open it up and fix it.

https://www.manualslib.com/manual/1302370/Defy-Dmo343.html

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It is cheaper to just replace the oven.

Sometimes the reason for the start button on your microwave not working ... But first, try holding the off/clear button on the keypad for 5 seconds for a soft reset.

You may download a copy of the manual at http://www.google.com/url?sa=t&rct=j&q=defy%20microwave%20dmo343&source=web&cd=2&cad=rja&ved=0CDEQFjAB&url=http%3A%2F%2Fwww.defy.co.za%2FgetFile.asp%3FPath%3DD%3A%255Cinetpub%255Cwwwroot%255Cwww.defy.co.za%255Cimages%255CManuals%2FDMO%2520343.pdf%26File%3DDMO%2520343.pdf%26Size%3D226743%26Name%3DDMO%2520343.pdf&ei=bhCRUfCqKOiayAHigoHoAw&usg=AFQjCNFsXwMoMxAWVIDKeUSSK9kOe6GOug&bvm=bv.46340616,d.aWc

You may download the manual at http://www.google.com/url?sa=t&rct=j&q=defy%20microwave%20dmo343&source=web&cd=2&cad=rja&ved=0CDEQFjAB&url=http%3A%2F%2Fwww.defy.co.za%2FgetFile.asp%3FPath%3DD%3A%255Cinetpub%255Cwwwroot%255Cwww.defy.co.za%255Cimages%255CManuals%2FDMO%2520343.pdf%26File%3DDMO%2520343.pdf%26Size%3D226743%26Name%3DDMO%2520343.pdf&ei=bhCRUfCqKOiayAHigoHoAw&usg=AFQjCNFsXwMoMxAWVIDKeUSSK9kOe6GOug&bvm=bv.46340616,d.aWc

You may download the manual at
http://www.defy.co.za/page.asp?pageId=7&mId=2

If you were to log on to the manufacturer's web site, I think you will be pleasantly surprised as usually one is able to download, by model number, Customer Instruction Manuals, list of Dealers, for spare parts and service, Driver downloads and Installation Instructions as required.

This is the best way of ensuring up to date drivers for your system and they are free of charge!

I hope this helps.