Sorry, I suppose I should have said I already checked the voltage - none to the switch. The switch works. I assumed it was the control board, I just wanted confirmation.
When I fill the machine from the nearby sink spigot, it functions just fine - until it needs water again . . .
Is there any other circuit board malfunction that could cause the breaker to pop? It seems to pop when the machine is in the "fill" time but with no water.
Not one, but two cut wires. Solder, heat shrink and prophylactic tape and we are back in business.