I roast a fair bit of Guatemalean to full city. Lately after a few roasts the roaster (R1 V2) would simply stop preheating. It would indicate P7, but the temperature would go down. When I finally asked for help, it was throwing an occasional ErC 0512.
Maybe this is obvious to you, but it wasn’t to me: my cooling tray was pointed back between the roaster’s front legs like everyone does in the youtube videos. That means the tray exhaust was blowing hot, oily, chaffy air directly at the induction board’s cooling air intake. You might want to consider:
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Point the cooling tray sideways instead, and
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Put it in your maintenance schedule to periodically take off your bottom cover and clean off the grille and vacuum the coils if they need it.
Flame away if I’m misunderstanding something here, but I’ve done those things and my preheat problems have stopped.