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by sokoloff 248 days ago
Which is only extremely tangentially related to "if I pull my thermostat off the wall"

The overwhelmingly most common connection between a thermostat and furnace is a contact closure when calling for heat, with no ability to differentiate between “thermostat is present but not calling for heat” and “thermostat is not present” as both present as "these T-T contacts are not closed/shorted together".