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What is the make and model of the thermostat?
Single Zone thermostat. E1 is a communication fault. That is usually in the cable at one end or the other. Clean those and be sure they are dry and replug. See if that allows you to reset it.
To the A/C and can usually be accessed from inside the coach once you remove the ceiling grill.
Do you have the manual for this or not? If not, I can get one for you when I get home from work in about an hour..
See the attached for one version.........http://bryantrv.com/docs2/docs/singlezonediag.pdf
Click on the attached link for anther......http://bryantrv.com/docs2/docs/operating/Single%20Zone%20LCD%20Operation%20Manual_3313327.037.pdf
Just checking back in to see if you were able to resolve this issue with the material I provided or do you still need some additional input from me here?
10-4. Let me know how it goes.
Is this a new installation or one that is OEM installed?
Some of these get power to the AC from the furnace circuit. Check that fuse or perhaps the circuit breaker at the furnace (depending on what make and model you have).
Hopefully, you got this resolved as I didn't hear back from you. You can always return to this posting again if you Bookmark it and we can do a follow up. All part of our service and please take time to enter a rating as that is the only way I get credit for my time spent helping you. Thanks! Be safe........
Is this due to not being able to find the 12 VDC positive lead up to the A/C?