Well. I can't tell if this is throwing good money after bad, or just weird money after OCD. But I need a differential voltage probe and a current probe if I want to continue down this ESD rabbit hole. I think there's some real need to Just Fix It.
How would it "pop out somewhere else"? This isn't a lightning bolt, where the electrons _will_ get through no matter what. The thermistor wiring isn't even the thing getting directly zapped, it's just next to it and has some charge induced.
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Well, it's a tiny little lightning bolt :-) The energy transfer has to be damped out/sunk somewhere. Mostly, I'd rather it go into a 24V rail with a 100uF cap on it and/or to earth ground because that's easy.
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Ie, shielding the thermistor lead is more straightforward than modding the Einsy or making an inline filter. The LCD board though, I think that's going to need an interstitial filter.
End of conversation
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