Cask Canning Line Foaming Issues
I would say that it is a short. I have the same issues. The problem I have is either the fill contacts under the Plexiglas trap condensation and make the connection through the water buildup or the condensation from the fill tubs going into the filler valves drip and short out the coil wire. We just re-did our connections to coils. Any oxidizing over the years have reduced the connectivity. There was an immediate response with that. Call me if you like, I have practically rebuilt this thing by now!
Butternuts Beer & Ale