On my 2016 Miramar the fan switch quit working when I turned the fan on high. It turned out to be a bad switch module. It was diagnosed by my dealer and was replaced free of charge. Thor is aware of the potential problem so may replace it even if out of warranty. It seems the problem in the switch caused the fuse to blow. I wouldn't use the high setting until you are at a place/time that it doesn't matter too much if it quits working again. Then give it a try.
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