Wyze Thermostat not powering up

I need a wider view. you should have 2 sets of thermostat wires there, one that goes to the outdoor ac unit and one that goes to the thermostat.
Also show the wyze wiring.

I have my old Honeywell back on the wall, the blue C wire is connected but only gets 8V.

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Ah, I see the problem. You connected the wrong blue wire. connect the blue wire that comes from this bundle to C.
image

That other blue wire is in the run to your outdoor A/C unit and isn’t likely connected to anything on the other end.
The reason you are seeing 8V across an unconnected wire and R is from capacitive coupling to the other wires in the bundle.

Got it working! Thank you for taking the time!

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