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Is this heat only or a/c and heat?
heat only. when lighting off for the winter season, furnace wiould not shut off. so I'm replacing the thermostat.
the old t-stat was digital. the new one is electromechanical. easier to use (I hoped)
Try hooking the W2 wire to the B terminal.
B terminal is what function?
It should be for the second stage heat or Aux. Please hit ACCEPT if this answers your issue.