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I thought I would try this once more before calling for service.I unplugged the unit, making sure that it was unplugged for well over 30 seconds.After it cycled through the POST, I pressed and held the fan speed selector for at least 5 seconds and the unit turned on and is now controlled by the humidistat and DET controls. It now appears to be fully functional.
So you need to make sure that owners are aware of the 5 second press and hold requirement. I may not have held it log enough before.