Sorry about the difficulty on the awning. There could be a quick resolution to this, but it is ideal to have a dealer check it out.
The first reason could be a bad switch. We do test these, but sometimes things go wrong.
First, you said you tried the fuse, it would be the very bottom one. No lights should be on in the fuse panel. If a fuse goes the light comes on.
Second, it must be the switch, the switch is held in with 2 screws. Once you take that off you will see a green and white wire. The switch just closes the circuit. If there is no motor movement, it will be something else.
My recommendation will be to call our service department here at Heartland and they will have a few solutions for you. The number is toll free 877-262-8032.