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how can i fix it and will the part i may need be expensive? Its second hand?

I have a Beko DVC6531. Main oven not heating up. Fan is blowing cold air.
Bacardi, April 2018
It's probably the element that has failed

Just search using a well known search engine for

"Beko DVC6531 element"

You'll find a variety of suppliers and a good few links to how to videos.

Hhttty, April 2018
link Click here to see other fixes for Beko DVC6531.