You can simply look at the compressor and see if the clutch at the front is turning. Anything electrical has either a fuse or relay. That's a good starting point. You should have a low pressure and high pressure switch. Low gas or too much pressure will stop the compressor from working. AC is a pretty straightforward design with compressor, dryer,However, condenser, etc. Nowadays they've added complicated electronics. Start with the simple stuff regarding troubleshooting. A 20 amp fuse might be all it is. I would check and see if your warranty is still valid.
Lovey & Thurston - Cali Foothills
2001 HR Vacationer (SS Minnow) - Gasser!
Obviously A Lowly and Inferior MH