Why the number stays a mystery
When an Asko built-in oven detects a control fault it shows a bare ErrXX on the display and nothing further. The manuals are deliberate about this: they tell you to disconnect power, wait, reconnect, and call a technician if the marker returns — they never print a table explaining what each number stands for.
Ignore the tables you find online
Because Asko issues no official decode, every online chart that turns the Err numbers into specific meanings is uncited guesswork, and reproducing it would mislead you. We treat the Err marker as a cue to measure, not as a diagnosis in its own right.
What a technician actually checks
Behind an oven Err the usual suspects are the temperature sensor and its wiring, the door-lock assembly after a pyrolytic cycle, the cooling-fan circuit, or the control board itself. Real symptoms — no heat, running hot, a fan that never stops, a door that will not release — drive the genuine diagnosis.
When to call
A one-off Err often clears on a full power cycle; a repeating one wants an experienced technician with a meter in hand and the correct genuine OEM or trusted-supplier part. Head to the oven error codes page or the error-codes library, then book oven repair.