It's a pain, but the annual cleaning is probably the best solution.  I had your same issue and it would work on low only, as on high it would shut off after 30 minutes. It didn't look that dirty to me when I vacuumed the heater element, but now it works. I tried vacuuming the general area, but that did not get the dust and lint off the heater element.
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2010 Mountaineer 285 RLD, 330 watts solar, 600 watts sine inverter, 3 type 31 agm batteries, Traveler antenna
2010 Dodge Ram 3500 SRW, 18k Reese slider, Honda 2000i, Firestone airbags
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