Wyze Thermostat not powering up

I just received my Wyze thermostat. I had a simple setup before: it was a standard thermostat that had wires in R (with jumper to Rc), W, Y, G, and C. The Wyze app easily pointed me to Rc, Y1, G, W1, and C. I have pushed the appropriate wires in and plugged the thermostat and put the power back on. The Wyze thermostat does not power up. Any suggestions?


Ok I got a fix! If you use the c-wire adapter, connect the G wire from the wall to the C terminal on ththermostat. This pictureand the associated video were not explained well at all!


I am having the same issue. Thermostat will not power up. Wiring looks good. I have power on the red cable.

I am having the same issue. Did anyone resolve it yet?

Gave up for today. Installed the old thermostat back on the wall. Didn’t expect this to turn into a project.


Also had to reinstall the old one. Seems so simple yet it doesn’t work. Not sure if they shipped out defective units?

I have 2 installed with no issues. I would verify you have 24V on R.

Alright, I didn’t check that yet. I’ll get my multimeter out and check that.

Test R to C and verify 24v

I have 24 volts AC on R . Should power up but does not.

Did you connect the green wire to C on the thermostat? If using the C Wire Adapter, green becomes C.


I’m also having this issue. Ended up putting old one back on and thinking about just returning it and not messing around with it.


Not sure my multimeter is working properly. But the old thermostat, which is the picture above, an Aprilaire is a 24 v and works.

Your thermostat looks like an Aprilaire 8810M :thinking:

Which “R” terminal were you trying to hook the red wire to? Rc or Rh?

Should look like this


Rc, looked just like your photo when I hooked it up. Wyze would not power up. My multimeter showed around 28VAC for R and around 4VAC for C if did it right, which I may not have.

I did not use the adapter of course because I already had a C

Mine was into Rh with a jumper to arc and the app said to put it into Rc

I have a blue wire for the C wire at my thermostat, when I go downstairs and look at my furnace, the blue wire isn’t connected to anything. Does this mean I do not have a c wire?