It's quite old, but a match to the double Neff Oven.

The time display goes blank after use. Otherwise it works normally for
setting the operating time. Press stop, and it appears at 12.00. Can then
be set and works normally, until the unit is used again.

Is there an internal battery that might have failed? It is never powered
down.

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*Why is "abbreviated" such a long word?

Dave Plowman London SW
To e-mail, change noise into sound.