Dave, when you unplug the controller, it should go to full fan, thats the fail safe built into them. When they fail, your fan will run at full speed keeping you from overheating. One thing you can try is, the next time it goes to full fan, try wiggeling the the wires where they enter the controller, when my unit started to fail I could get it out of full fan by playing aroud with the wires......Bruce
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Bruce and Sandy 2018 Coachmen Leprechaun 26DS Chevy
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