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Got the new control board, installed it, and it didn't work. Vacuum ran continuously with nothing plugged in. As usual, when I hit any setback at all, I walk away and start a new project.
A week later, I get my multimeter out, really scrutinize how the whole thing works, then start taking voltage measurements to see if they agree with my expectations. For some reason it took me that long to realize I could keep the vacuum motor disconnected as I tested the relay.
Shorting between the 2 spade terminals, I could hear the relay click and measure 120v AC at the motor terminals. It did this reliably.
I connected the motor and reassembled everything, and it's working perfectly. Strangely, the original unit is passing my new testing methodology too.
The Russian saying is that problems avoid those who are capable to solve them. Now that I know precisely how the whole thing works, the gremlins have moved on.
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