Why doesn’t the fan on my outside unit come on?
You should first make sure that there is power to the outside unit. When your thermostat is set and the unit should be coming on, go outside and listen for a humming noise. If you hear no noise, then you probably have no power to the unit. Check the power disconnect outside at the unit (if breaker type, flip off then on again; if fuse type, pull out then push back in), then check the breaker inside at the breaker panel. If this does not bring on the unit then you should call for service.