check the thermal fuse if it has one. Some treadmills have a thermal fuse on the fan circuit, it will pop and the fan will not come on, but it will not reset on its own.
my x22i had the same issue. Ifit support told me to do a factory reset on the console lol. Didnt help though. Figured out its was the ribbon cable between the console and the keypad. Treadmills first line support is literally useless.
