Mike 2338,
I had the same E3 code a couple weeks ago. I believe it was caused by us leaving the coach out of level while we were eating in a restaurant. I found a disconnect switch had thrown. It is located on the left side of the fridge inside the lower outside vent. It is between a couple wires and hard to find. All I did was push the tiny button back in and reset the thing. Things have worked perfectly ever since. Hope this helps.
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