I have a heat-only system and no C-wire. What do I do?

You should have Rc, G, W1 wiring instead.

For a heat-only system, you should have the connections R, G, and W1. The G wire can repurposed as a C-wire.
  1. Identify the G wire at your control board.
  2. Connect the G wire to the C terminal at the control board.
  3. At the thermostat, label the G wire from the old thermostat as C-wire.
  4. Follow the Wyze app to continue the installation process, selecting Rc, G, W. 
Note: To keep fan control, you need to add an additional jumper wire between the G terminal and the W terminal.
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