Some electronic fan controllers have an integral max speed relay and the contacts can fuse together and stick, tap it after you have selected lower speed to see if that does it. Still likely will need a new controller to fix it once and for all. Check fan current on max, if it uses too much current it will fail a new controller in time.
A/C Fan Control Problem?
The A/C fan speed control won't repond to speed changes. The fan stays on constant high even though the indicator shows it adjusting. Anything I can check to save me a service trip?
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