Yes, two of them. I can find no indication of what could have led to this, I'm open to ideas from anyone.That is wild. I've never heard of that happening. Multiple heaters too? The odds just seem completely impossible.
I visually inspected both heaters and there are no signs of damage, cracks, etc. to either unit.
I power cycled the Helio controller several times and it defaulted back to the E4 low temperature error and kicked on power to the outlets for both heaters. I monitored for power draw on the apex when I performed this and it hit 2 watts the Helio turned back on.
There is nothing else experiencing issues in the tank. Thankfully I'm just cycling so nothing was harmed.