Be sure your set point temperature is below what the Air8 control panel is displaying. (Currently, the temperature sensor is located down in front of the a/c unit’s intake.) Just as a test, run it down as low as it will go, which I think is 61 degrees. I have observed a bit of a delay before it starts as well.
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2020 T@B 400 BD Lite
2021 T@B 320S Boondock | 2019 BMW X3 M40i
The AIR8 plugs into a conventional GFI outlet under the bed. Check to see if the GFI has tripped or the plug has come loose.
Edit. Sorry the fan would come on if this was the case.
https://tab-rv.vanillacommunity.com/discussion/10397/official-statement-from-scott-hubble-concerning-the-air8-air-conditioner/p10
2021 T@B 320S Boondock | 2019 BMW X3 M40i