On the gas fireplaces i have installed the on off switch was a millivolt contact.
Gas fireplace switch wiring.
If the fireplace is a 120v control then in most cases you will need a neutral.
All the switch is doing is making or breaking a connection it is not wired up to standard 110 volts.
A wiring diagram is a simplified traditional pictorial representation of an electric circuit.
Assortment of gas fireplace wiring diagram.
Crimp the connectors securely to the wires.
The thermopile in your fireplace puts out millivolts nothing near the 120v the light switch was designed for.
If this is the case there will be no power to run the smart switch unless it is battery powered.
It s probably just a matter of finding a switch with a low enough on resistance.
Slide the provided spade connectors onto the stripped ends of the wires in the gas fireplace control panel.
Slide the spade connectors onto the spade terminals on the back of the switch in the control panel or connect them directly to the pigtail wires if installed.