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This is the connection to the furnace The upper left hand area is where the thermostat wires connect to:

Hi Renz,1. I am in North America.2. I have a Google Nest Snow Thermostat SKU GA01334-US3. We have an Weil-McLain Gold Oil furnace and boiler4. The control board wiring isn’t very accessible, but there is only a red and yellow connected wire where the...