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
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?)
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
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.
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.
Good luck! And check if your local utilities have a smart thermostat rebate program, mine gave me a Nest for free.
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?
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?
What’s the actual problem? Do you have it wired onto a circuit and it’s not getting power?
Not necessarily, some actually will run off of just the trickle voltage in the furnace hookup wiring. Some do have batteries and recharge this way, as well.
No battery in this one. Yes it’s running of trickle power from the furnace about to test the amperage.
They don't run off of trickle voltage they run off of dedicated 24VAC IF they are hardwired. I believe the R & C wires are your 24 volts
Yeah, it looks like it’s got a completed circuit https://ibb.co/Yfh5W1C
if you've got that and your thermostat is not displaying anything it's probably dead
weirdly i have a honeywell thermostat i'm about to hook up too but stopped when i realized my current one that came with the house is wired strangely. talked to an HVAC family member yesterday and he said that miswiring the common (return) wire or the (typically red and black) voltage wires can do stuff like that. do you know the model of your air handler?
Sorry, I don’t know the air handler model. I could check a bunch of things?
It looks like the circuit supplying voltage is still providing roughly the measurable power needed to operate. https://ibb.co/Yfh5W1C
do you have any access to the inside unit? behind the return air vent (where the filter would be)? do you have a seperate furnace and air handler maybe? usually the brand and model number are on the inside unit. mostly so i can try to pull the manual for it because it will have it's own thermostat wiring info usually the color coding it uses and the voltages. for example i just have a heat pump with an electric strip in it so there's just a single air handler.
It ended up just being a dead thermostat, got a dumb version to slot right in and it came up fine. Thanks for your help!
Yep, just needed a replacement so that’ll probably die in 2 years again.
What's the issue? Heat not working? What kind of heat? Most furnaces all you've got to do it connect the 2 wires together and it will try to start up. Oil furnaces have a reset button you need to press if they fail to light. (failing to light is a symptom of a different issue)
