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I have the Honeywell Home - 7-Day Programmable Thermostat. When my roommate installed the device it was winter and everything appeared to work fine. Now that it’s heating up, it’s impossible to cool the apartment down. My apartment complex says the AC unit outside isn’t even kicking on. I took a look at the wiring and this is what it looked like: enter image description here

G wire > G terminal
W wire > W terminal
Y wire > C terminal
R wire > R terminal
Jumper > R to Rc
C wire > unattached

At this point the thermostat still powered on. Now I have reattached the wires as follows and the thermostat doesn’t even power on:enter image description here

G wire > G terminal
W wire > W terminal
Y wire > Y terminal
C wire > C terminal
R wire > R terminal
Jumper > R to Rc

Any ideas as to 1) why it isn’t powering on and 2) alternative ways to wire the device?

3
  • Can you post photos of how the furnace/air-handler is wired? Apr 10 '20 at 1:54
  • 1
    Blue wire is most likely not hooked up at the air handler.
    – JPhi1618
    Apr 10 '20 at 2:29
  • Do you have a multi-meter? You can measure voltages across.
    – J.Hirsch
    Apr 10 '20 at 15:18

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