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Now I'm getting a six-flash code. Time to get the guys out here to look at it. Luckily, it did restart after one hour, just like it is supposed to.
Oh, and I feel really dumb, but I could not find...

I occasionally get 5 flash fault codes. I find that turning the furnace off then back on again (on the unit itself) fixes the problem for now, until I can get my HVAC guys to come look at it.
If you...