Sorry to say, if it is level and still acting up, you may need to have it serviced. The troubleshooting charts look pretty straightforward, but even if you had a multimeter and could access all the test points, there would still be the problem of getting parts.
John and Henrietta, Late 2016 T@B S Max in Western New York
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2021 T@b 320 Boondock "Mattie Ross" | 2021 T@b Nights: 239 | Total nights in a T@b 455 | 2022 Jeep Grand Cherokee L Overland | T@b owner since 2014
It will run in 12v mode (it's powered by the 12v system).
It only runs when the fins reach a certain temperature.
2014 S Maxx
2011 Tacoma 4cyl ... edit: 2022 Tacoma 6cyl - oh yeah!
A_Little_T@b'll_Do_Ya