Roof ac/heat pump 2016 Sightseer

[Brooks]

I have a 2016 Sightseer with a RVComfort.HP Coleman Mach the last 2 days when I turn the heat on in the front it comes on for a few seconds and then shuts off and when it shuts off I can hear a click in the thermostat and after that it won't come on at all until I tried it again this morning and then same thing. Any help would be greatly appreciated, Thanks