I have a new FEC 500. This is my second mobile unit. I have never seen this before. Twice now, during long cooks, (12 + hours ) my smoker shuts down and the I.Q.4 read out shows 8 black squares and the code 999_ . What the heck is that? Any thoughts??? Is there a high temp limit switch or something that could be tripping? When I start @ 1-2 a.m. it's all good ( outside temp about 40 degrees)
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