visionpro t-stat with EE displayed

[hvac18]

i have a t-stat that customer says is displaying EE i have not seen this. Has anyone seen this or knows whats going on with it.

[STEVEusaPA]

got any more info? Where (what part of the screen) is it displaying it...what mode is it in.....what else is on the screen?
What model?

[pecker head]

I have seen it once before.. I just replaced it...