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HVAC/Changing Thermostat…help? UPDATE: SUCCESS!
Posted on 3/8/24 at 1:01 pm
Posted on 3/8/24 at 1:01 pm
Update: Thanks to everyone that chimed in! This TD Premium subscription is paying dividends!!
What am I doing wrong here? Seems pretty simple. Changing to a Wi-Fi thermostat that needs to be hardwired. From the limited info I have in the instructions, thought this was right but I’m not getting power to the device.
Old…
New…
This post was edited on 3/8/24 at 6:50 pm
5
Posted on 3/8/24 at 1:05 pm to Schmelly
For my Nest Learning Thermostat, it came up with a slideshow style instruction list. Once I did each step, it would show a screen onto the next step and show what the wires should look like, setting up wifi, etc. (all done from my phone)
Your blue wire is your common wire that runs power to the thermostat. Did you tighten the connection?
Your blue wire is your common wire that runs power to the thermostat. Did you tighten the connection?
Posted on 3/8/24 at 1:08 pm to BilbeauTBaggins
Posted on 3/8/24 at 1:09 pm to Schmelly
If its not getting power thats a hardwire issue.
But just an fyi, its not as simple as plugging the wires in and you are done. Most thermostats you have to program it for your unit. One stage or 2 stage, electric heat, gas heat, etc.
So make sure you do that right away.
But just an fyi, its not as simple as plugging the wires in and you are done. Most thermostats you have to program it for your unit. One stage or 2 stage, electric heat, gas heat, etc.
So make sure you do that right away.
Posted on 3/8/24 at 1:09 pm to BilbeauTBaggins
Yeah, it’s in there. I just stripped a lil too much insulation. This is a Pro 701i. There is ZERO YouTube help with this lol. And the instructions are shite
Posted on 3/8/24 at 1:11 pm to BilbeauTBaggins
I think I took the pic after I started disconnecting everything. It doesn’t look like the screw is tightened in the pic. But it was, I promise lol
Posted on 3/8/24 at 1:12 pm to baldona
quote:
Most thermostats you have to program it for your unit. One stage or 2 stage, electric heat, gas heat, etc.
Hard to do that if there’s no power lol. So maybe that common wire isn’t connected to anything?
This post was edited on 3/8/24 at 1:13 pm
Posted on 3/8/24 at 1:14 pm to baldona
quote:
Most thermostats you have to program it for your unit. One stage or 2 stage, electric heat, gas heat, etc.
My nest only required me to figure out when I wanted cold air to run and when I wanted hot air to run. It wasn't that hard IMO. That was the first home upgrade I did when I bought my house.
OP's problem is they haven't gotten power to the device.
Posted on 3/8/24 at 1:20 pm to BilbeauTBaggins
I hooked the old one back up. Thankfully I didn’t frick anything up lol
Posted on 3/8/24 at 1:20 pm to BilbeauTBaggins
Does the nest have to be hardwired?
Posted on 3/8/24 at 1:24 pm to Schmelly
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power. Have you checked it with a multimeter?
Posted on 3/8/24 at 1:30 pm to Schmelly
Disclaimer: I'm not an HVAC specialist, I just had to do a little research when trying to decipher what all the colors and letters meant because even though I know it's simple to just copy/paste from the old to new thermostat. I just like knowing what the individual parts do.
From what I'm reading, the cheaper Nests are powered by the batteries/common wire/no common wire. It requires some finagling. Here's a link I found specifically for the nest I own. Our original thermostat was powered by a common wire:
HOW TO INSTALL NEST THERMOSTAT ON AN OLD FURNACE WITH NO C WIRE?
It's possible you didn't need to power the old thermostat with a common wire, but that this new one needs it and your current common wire isn't running power. As mentioned, run a multimeter to determine if there's power coming to the end of that common wire.
From what I'm reading, the cheaper Nests are powered by the batteries/common wire/no common wire. It requires some finagling. Here's a link I found specifically for the nest I own. Our original thermostat was powered by a common wire:
HOW TO INSTALL NEST THERMOSTAT ON AN OLD FURNACE WITH NO C WIRE?
It's possible you didn't need to power the old thermostat with a common wire, but that this new one needs it and your current common wire isn't running power. As mentioned, run a multimeter to determine if there's power coming to the end of that common wire.
Posted on 3/8/24 at 1:34 pm to Schmelly
You need to hook the blue wire to the C terminal on the control board of the air handler, likely in the attic. It's not hard to do if you were already capable of hooking up the new thermostat. I would disconnect the unit from power (unplug if gas, turn off breaker if electric heat) to prevent shorting out the transformer. You are probably so so so close to having it hooked up right, the wifi tsat needs its own power supply from the C terminal.
Posted on 3/8/24 at 1:35 pm to TAMU-93
quote:
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power. Have you checked it with a multimeter?
Nope. Figured that’s what the deal was when nothing was happening. Thanks
Posted on 3/8/24 at 1:37 pm to deathinthedelta
Thanks
Posted on 3/8/24 at 2:09 pm to deathinthedelta
quote:
You need to hook the blue wire to the C terminal on the control board of the air handler, likely in the attic.
This. Most thermostat wires will have a spare conductor that is unused in the cable. So land one of the spare wires (likely blue) on the C terminal of the control board inside the air handler. Then you'll get control voltage to the thermostat and be in business.
Posted on 3/8/24 at 2:20 pm to TAMU-93
quote:
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power. Have you checked it with a multimeter?
Thats my bet, nobody would leave an energized wire just sitting around in a box without a wire nut or something, even if its just low voltage.
Posted on 3/8/24 at 3:00 pm to TAMU-93
quote:This would be my bet.
The common wire wasn't used by the old thermostat. It's probably not connected to the control board on the other end, thus no power.
Posted on 3/8/24 at 3:15 pm to Schmelly
I know my Ecobee thermostats needed power extender kits installed on the units because I didn't have a "C" wire.
It seems you have a C wire though.
It seems you have a C wire though.
Posted on 3/8/24 at 3:17 pm to bapple
quote:
This. Most thermostat wires will have a spare conductor that is unused in the cable. So land one of the spare wires (likely blue) on the C terminal of the control board inside the air handler. Then you'll get control voltage to the thermostat and be in business.
Ok, I’m bout to go in the attic to investigate. More pics/questions to follow when I get lost. Probably something along the lines of “found the blue wire…wtf do I plug it into?” Lol
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