Furnace is a huge old Bryant and existing thermostat is an old round honeywell with the mercury bulb. I followed what the app said for wiring based on the old thermostat but nothing happens when I switch the power back on. I checked all the connections, but I don’t really know what else to try.
My reply may be of limited help, but let me toss this out there. If there is 24V AC (or anything close to it) across the Wyze C and Rc terminals the thermostat should power up. The thermostat will first power up with “Wyze” on its display.
Things to check:
If you have a multimeter, put it on the AC setting and with your HVAC system powered on, measure the voltage across your B and R wires. If it is not 24V AC, then we will need to hunt down a source of 24V AC in your system. If you do have a meter to measure with, my curiosity would next take me to measure between R and any of the other wires to see if there is 24V there. It may be that your “B” isn’t really a common © wire equivalent, but if your HVAC system is 24 V AC based, as most are, that should be possible to resolve.
Can you share a photo of the furnace wiring?
So having taken the panel off, brown and blue go to nothing…
Do you have an A/C unit outdoors or is this heat only?
Yeah a/c is outdoor. It looks like another wire set is connected to that. Yellow from the thermostat is connected (wire nut) to the red and yellow that go to a/c and the green and black to the a/c are on the furnace board’s C terminal.
You should be ok with stripping the end of the blue wire and putting it under that C terminal in the furnace as well. This should provide the wyze with the power it needs to run.
Tell the wyze you have the following wires:
I wired the old thermostat back up for the night before I first posted, but I will give this a shot tomorrow. Thanks for your help, I’ll update after I try it.
I somehow blew the 3 amp fuse on the board, but after replacing that it’s working great.