u use the actual up arrow, not the fan up + symbol. im guessin thats what ur doing cos i did the same thing! hold the re-circ button and hit the up arrow, then it should work.
I didn't realise these codes were secret.
The climate diagnostic display is mostly used for channel 17, which displays actual speed rather than optimistic speedo speed. Although a lot of people have GPS/SatNav for that these days.
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