How do I know if my AC fuse is blown?
How do I know if my AC fuse is blown? If your outdoor AC unit is not turning on and there is a slight hum near the unit (but no cold air), chances are the AC fuse has gone bad. The hum originates from the furnace/thermostat continually sending signals that your home needs cold air.
Is there an AC reset button?
Look for it first around on the exterior of your machine, especially along the bottom edge near the ground. An AC's reset button is typically red and visible, so it should be easy to spot. If you don't see a reset button on the outside, it could be located inside the unit behind the service panel.