Where can I get a selinoid for a Atwood G6A-4E gas velve?

Yes
http://waterheatertimer.org/Atwood-water-heater-resources.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link:
http://waterheatertimer.org/Atwood-water-heater-resources.html

gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link for possible resources:
http://waterheatertimer.org/Atwood-water-heater-resources.html

Call service center.
Replace heater.

Gene
h

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Check the gas line orifice for a spider web. Its possible the gas is not able to get past the web.

Yes. As long as it's an atwood 6 gal., the opening should be same dimensions. Keep in mind that you will need to supply hydro to water heater in order to operate it on electric, as well as switch etc. For electronic ignition of gas, you will need to supply a 12 VDC source, and switch as well.

If this model has a thremo couple you might want to check it. It sounds like that is the problem.

Make sure propane is on and getting to your stove burners ok, first, then try switching it back on. If it fails to ignite, shut switch off and try a couple of times, if still no ignition, get back to me.

I am a RV service tech and that is an old unit. Your control board is bad but with the age of that unit I would strongly suggest replacing the whole water heater, you can shove a pile of money at it and still have an old water heater when for 3 to 500 bucks you can have a new one with a 2 year warranty