Hello, and happy New year,
Just installed my new Wyze thermostat, replacing Lennox 51M33, The old wiring is visible on this pic - 20201229191536154.jpg - Google Drive, There are 7 wires connected to the following terminals;
dark grey (L)
light grey (C)
The installation within the Wyze app told me to ignore the dark grey wire (L) - see the screenshot - Screenshot_20201231-074402_Wyze.jpg - Google Drive
During the test runs the air was tepid, not warm, and now it doesnt seem like it is heating at all.
Why was I told to ignore this one wire? It must have been used for something in the old thermostat …