“Thermostat doesn’t power up. Measure voltage from R to C is 18.50 VAC . Is it the reason or something else? C wire is ground correct? Please help. Thanks.”
1-1 of 1 Answer
Hello, Caule! The Amazon Smart Thermostat is compatible with most 24V HVAC systems (i.e. conventional force air, heat pump, radiant boiler). Not compatible with 110-240V HVAC systems (like electric baseboard heat.) Some things you can try to get power to the device are removing the thermostat faceplate and look at the R jumper switch, the blue jumper cover at the lower right corner. If you have one R-wire, make sure it's connected to the R terminal (not to Rc), and that the R jumper switch is in the up position. If you have two R-wires, they should connect to R and Rc, and the jumper switch should be in the down position. Did your previous thermostat have batteries? If so, and you connected a C-wire to your new thermostat, the C-wire might not be connected correctly at your HVAC control board. At your HVAC control board, check that the wire matching your thermostat C-wire is connected to the terminal labeled "24 V Common." I hope this helps, have a great day!
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