Repaired the Dometic Water Heater DH-6GEA that came with my 2021 Winnebago Micro Mini 1708FB, just purchased last April 2021.
The water heater has worked fine on either propane or electric, but recently stopped working enroute from Los Angeles to central Iowa. I checked the burner but it was clean all the way through, no cobwebs or mud daubers, etc.
But when I checked the thermal coupler (diode) with my multimeter, there was no end-to-end continuity, meaning it had blown. No problem, I found a local RV parts and service dealer and purchased a couple thermal couplers and a spare igniter.
Fortunately replacing the thermal coupler fixed the problem...but it was still troubling to not know why it overheated and blew. The only thing I could think of is the day I forgot to turn the water heater off and then drove across the higher elevations of Arizona and New Mexico. 😬 I am guessing the air-fuel mixture should have been adjusted for the higher elevations/lower oxygen levels, and that caused a flare up.
Lessons Learned: Double-check that everything is turned off before driving! And it never hurts to have spare parts and a good tool kit. I will also be purchasing a spare DSI Control Board for the water heater, but it will be the more reliable Dinosaur brand rather than Dometic.