Originally Posted by UKDUDE
I have the same Maxxfan, and it's my understanding that the plus and minus buttons raise and lower the temperature settings rather than the speed. Hold down the Auto button to set the default back to 78F
Sort of. If you hold down the auto button, the LED lights up to indicate it's on auto. The arrows then control temperature from the default value of 78.
However, if you were to hit the power button to turn the fan off, then hit the power button again to turn the fan on, it will be in manual mode, and the LED will not be lit. In that case, the arrows control fan speed, not temperature.