Jim,
I do think that isn’t hard to verify again tacho and it’s wires… that happen when electronics does not see that motor is rotating (tacho signal isn’t received by electronic) and triac it’s enable to be commanded…
I have had more than one taco with a crack in it , I even had one go with a big bang on its first test wash after changing the module. Me not happy that day.
By a stroke of good fortune I was installing a new ISE-2 today to replace an old Hoover machine with a damaged outer drum, the motor ( now in the back of my car ) was in perfect condition. 8)