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I did get it figured out. The switch never was wired properly. I put the spill switch in series on one leg to TH/TP and everything worked like its supposed to.
Thanks,
flue @charter.net

I was servicing an Archguard B-vent insert today. No problems until I went
to reassemble. I couldn't remember where the spill switch wires went. One
had been connected to the TP terminal on the...