Wyze thermostat and 24v adapter

[speadie]

You would need both of the C adapter wires to be connected to the wyze, or have the common come from the transformer on your aquastat. Unfortunately, there is no way for the current to make a loop through the load if both transformer wires are not connected to it,

Wyze thermostat simplified block diagrams

I made a couple of simplified block diagrams to show why running the wyze thermostat requires a C wire and why if you use an external transformer, you cannot use the Cooling aspects of the wyze. Not sure if this will help anyone, but it’s worth trying. Current needs to flow through the R and C terminals of the transformer, through a load in order for that load to get powered properly. Without a complete loop back to the transformer, you run the risk of the current finding its way back through…