That’s what looked like the problem to me too but if their sending a new controller too then hey that’s cool. But I think I am goin to try that if I’m still holding onto the old boiler.
As an electrical engineer, I can tell you that a current surge is due to a DECREASE in resistance (Current=Volts / Ohms)or a partial short to ground (a couple of strands will do that). I had issues with Grainfather and proved that my heating element resistance was too high so it would not boil water. after a month or so with electrical tests back and forth, an entirely new unit showed up on my doorstep. I had already purchased a Hot Stick and solved the slow heating issue but they do have good customer service once you get their attention. Any wiring you replace to a heating unit needs to be rated HTML (high temperature motor lead) for this application. Cheers