Edit: can’t believe I didn’t describe the issue. The thermostat itself is just unresponsive, blank screen. It’s not receiving power. It doesn’t appear to be a model with batteries btw, as I see no way to open any of the back portion of it.

Edit 2Am I an idiot? I don’t see a battery compartment anywhere:

https://ibb.co/hYDhVYH

Also I can see from the voltmeter that the C-R labeled wiring is receiving roughly the required voltage. https://ibb.co/Yfh5W1C

Heading to the hardware store to buy a multimeter.

I threw some circuit breakers in the house last night while investigating a light, but they all should’ve just been in the kitchen.

The user manual says nothing of real value to me. I’ve thrown the AC, heater, and other circuit breakers. Anything I can do other than check with a multimeter and then call a technician?

https://digitalassets.resideo.com/damroot/Original/10014/33-00182EFS.pdf?_ga=2.88827611.1567563007.1669391413-594870340.1669391413

  • StewartCopelandsDad [he/him]
    ·
    2 years ago

    can you post a picture of the wires going from the wall into the thermostat backing plate? maybe one is loose? did the problem start right after the breakers blew last night?

    If it's getting the required 24V (28 is fine, it's getting converted to low voltage DC for the electronics anyway) then yeah, thermostat has probably killed itself. (In that case, no harm unscrewing the back to make sure it doesn't have a battery in there somewhere. I think your model might have a little lipo inside?)

    • copyleft [none/use name]
      ·
      2 years ago

      Ask and ye shall receive, I think most of them look seated OK but the last time I wired anything was high school: https://ibb.co/GnTvR2N

      • StewartCopelandsDad [he/him]
        ·
        2 years ago

        looks fine, give em a tug to make sure they're not loose. with a C wire your thermostat is unlikely to need a battery

        oh and FYI - if you are cold, you can manually connect the R and W wires with an alligator clip / paperclip / etc. this will turn your heater on, buy you some comfort to fix the problem. Safe for furnace, a thermostat just switches a relay to connect these two wires.

        • copyleft [none/use name]
          ·
          2 years ago

          Nothing came loose! I cleaned up the thermostat pins / checked they weren’t bent.

          Thanks for the tip, that’ll definitely come in handy in the meantime cause I think I might just have to go pick up a new thermostat and test it out.

          • StewartCopelandsDad [he/him]
            ·
            2 years ago

            Good luck! And check if your local utilities have a smart thermostat rebate program, mine gave me a Nest for free.

            • copyleft [none/use name]
              ·
              2 years ago

              One last quick question: I just threw my breakers labeled Furnace and AC, and the lines are still hot. What else could it be receiving power from?

              • StewartCopelandsDad [he/him]
                ·
                2 years ago

                that's odd. power should be coming from your furnace. They sell adapter kits that use a power outlet to inject power where you don't have a C wire from the furnace, but those are pretty obvious and usually located near the thermostat on the wall. Maybe your breakers are mislabeled?