David wrote:

If it has one of the dryness sensors, that could be the problem. I have
seen these fail with an open electrolytic filter capacitor. That module
will either allow or not allow the timer to advance. Try it on timed
heat first to see if it advances then.

This model does not have the dryness sensor. Thx for the input, I'll get the
module and give it a shot.
/ff