My Thermostat 3M50 does not turn the Heat on. I have good Wi-Fi connectivity. The C-Wire is fine. I have tested the following wire couples and all have atleast 24 volts. Red-Yellow, Red-White, Red-Green and Red-Cwire. The fan turns on when I set the fan to "on", however, it blows cold. The fan does not come on in "Auto". I have a Lennox 15GCSXAV-60-110 X-230 Package Unit. I have hooked up my old thermostat and the heat works fine.