According to the piece of paper (manual?) that came with my Helix 1000:

E2 & E3 denotes invalid day and night temperatures, respectively. Both temperatures can only be between 65 F and 110 F. If a memory setting becomes corrupted, the controller will detect it and reset itself, or safely default to 85 F, and the red trouble light will stay on until the appropriate setting has been reset.

Even though you're not using nite drop, make sure the nite drop setting is set above 65. I'd probably set it to the same as the day temp setting just to try avoid any conflicts.

Hope that helps!
HH
-----
Due to political correctness run amuck,
this ol' hillbilly is now referred to as an:
Appalachian American


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