Install - TZEMT400BB3

[geniepro]

Hello,

I have a running 4 wire thermostat, now I need to install another thermostat which is 5 wire, TZEMT400BB3. The Blue wire was not connected upstairs in the AC unit or thermostat, so I connected it to C terminal, same terminal where the wire goes to the outside compressor. Not the thermostat still doesn't power up, all wires are connected correctly.

Can it be a faulty wire?

I tested the thermostat on another unit, another location where I have all the 5 wires connected and it works.

Thank you.

[Thermostat]

You need to verify the voltage between the R wire and C wire at the thermostat with a volt meter. You should have some where between 24vac to 28vac

[geniepro]

Correct, I did that and was able to figure out that the wire was interrupted somewhere.