A/C No High Speed

[MSB1766]

I have a 2011 Keystone Larado 291TG.

My A/C unit runs ok on low speed fan but when I switch the fan to High it stops running. No fan or A/C. also if the A/C is off and I switch the fan from AUTO to low the fan runs, but when I switch the fan speed to high it stops.
I can hear a buzzing sound when I switch into high fan.

[ChuckS]

If you have a multi meter and the skill sets to troubleshoot this manual with wire diagram should take you right t9 the problem....

https://www.airxcel.com/DesktopModules/RvProduct/Pdf/1976141_copy.pdf

[MSB1766]

*Update*

Took it to the dealer and it turned out to be the Thermostat.