Originally Posted by
zzsteve
There is a 'calibration' cycle of distribution and blend motors on every power-up. The HEVAC looks for the end stop positions by looking for a current peak in each drive direction. This sets its limits in firmware. It maybe why electrically noisy pots and/or motors just won't calibrate even if they test OK on the bench. A Nanocom calibration might seek these limits too, but more importantly I think it maps the distribution motor positions with respect to the limit positions so that airflow to face, feet and screen etc... is correct.
Watch those replacement pots. There are two models, different by one letter in the part no. and the only difference is - the slot is 90 degrees away.
HTH
cheers,
Steve
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