So, up early, leaving home at 5:30 to be somewhere else by 7:00. Lovely morning, cruising up the freeway, AC off but the blowers on about three squares, just to circulate a little air. Suddenly, about 45 minutes in, the blowers, of their own volition, crank up to High. I turn the knob down, back to three squares, the blowers obey, and we are all good for the rest of the day!
Thoughts?
Yep, classic sign of a Poltergeist?
When it went to full tilt, did the bar graph max out as well? If so, the controller simply threw a wobbly.
Marty would have more insight on that one.
I'd say dirty contacts on the blower speed adjustment - if you find its difficult to turn the speed up or down without needing a few attempts to get it where you want, that's another sign of this.
Hi Bolt, yes, the bar graph went to max as well, so as Sloth says, I might start with the rotary switch contacts.