You may want to replace (or tests it first) the capacitor what may happened is that the capacitor short out and then it inverted the poles so when you turn the air on it starts backwards. the capacitor is like a tiny cylinder that keeps electric charge and it will spark when you turn it on that makes the motor move, the cost depends on the model and it should be close to the motor where the fan is just follow the wires. here are some samples of what a capacitor look like
Answers & Comments
You may want to replace (or tests it first) the capacitor what may happened is that the capacitor short out and then it inverted the poles so when you turn the air on it starts backwards. the capacitor is like a tiny cylinder that keeps electric charge and it will spark when you turn it on that makes the motor move, the cost depends on the model and it should be close to the motor where the fan is just follow the wires.
here are some samples of what a capacitor look like
let me know if that solves the problem
thx