My suggestion is NEVER EVER use the self cleaning feature. We see questions like yours at least 4 times a week. Locked doors, burned out elements, burnt out fans and even frazzled control boards. The temperature is just too hostile.
The oven is cleaned by heat, at temperatures above normal cooking temperatures. During the cleaning cycle the oven is heated to
about 880 degrees Fahrenheit (471° C.). At this temperature, food soils inside the oven decompose, leaving behind a small amount of ash.
There are a few ideas here
https://www.justanswer.com/uk-appliance/65fdd-ra-ce.html
But Neff says you need a Service Call.
https://www.neff-home.com/uk/service/support/ovens/error-codes
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