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Questions tagged [nest]

The Nest is a programmable, internet-enabled thermostat

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Trying to understand Nest thermostat wiring

I just arrived at my parents' house to discover that as of last week, their Nest thermostats (2, separate A/C, shared furnace) are continuously running out of power and needing to be charged. ...
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Where do i connect a common wire?

I'm trying to install a nest wifi thermostat and I can't figure out where to connect the blue common wire. I've attached a pic of my ac setup and I'm hoping someone can tell me where it goes! This is ...
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Another C-wire for Nest thermostat question

Some background first. 30-ish year old furnace/boiler with a zone system and six zones. This was my parents full-time residence in rural Maine, but after my father passed away in 2022, and my mother ...
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Nest Power Connector (C Wire) on A/C unit GMP075-4

I’m trying to use a Nest thermostat on my older Goodman GMP075-4 unit. I have a Y, R, W, and G connector for the thermostat. I’ve read through a few number of the other questions related to this on ...
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Wiring for Nest Thermostat No "Auto" fan Hydro-Air

Currently, my thermostat has G, W, Y and R wires. I have central AC Unit outside, Propane Furnace and an Air Handler in the attic. (Hydro-air) is what I was told. I tried to install a Nest Thermostat ...
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Connecting Nest thermostat to this power adapter

My question is probably simple for those in the know. I've looked at the manual, and researched and Googled, however I'm still not confident. I tested this and got 24v on the red wire in bottom left ...
user182393's user avatar
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DUAL Nest Power Connector wiring - separate heat/cool thermostats

My house has separate thermostats for heat and cool, each located in a different part of the house. It's a single-zone forced air system handling both heat and cool. The existing thermostat wiring ...
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How does a Google Nest power connector work?

I am looking at the installation instructions and they all show that the power connector goes back to the furnace/AC control panelIf this is installed just to make sure the thermostat gets enough ...
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Nest Doorbell 2nd generation Interior chime buzzing not ringing

Today I got a nest doorbell 2nd generation and installed it. Doorbell chime is working fine but interior chime ringing is not working it’s buzzing when you press the door bell. Here is the screenshot ...
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Adding smart thermostat (nest) to burnham series 2 boiler

I’m trying to add a nest thermostat to my burnham series 2 boiler with two zones. My original thermostat has a red and white wire going to W and R with a jumper from R to RC. See first photo. Where ...
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Wiring Question When attempting to Replace Honeywell with a Nest Thermostat

I am trying to determine which Nest will work to replace honeywell device. I am a bit confused with the current wires. At the moment I have; G=Green Wire, R=Red Wire, O= Blue Wire, Y=Yellow Wire. It ...
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Nest thermostat and no C wire at my boiler

so I bought a nest thermostat and it keeps running through the AAA batteries, recommending that I use a C wire, though there's just 2 coming out of the wall (red and white). I got C wire/power adapter ...
Brian Battenfeld's user avatar
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Trane XR95 No power (2 volts) to Thermostat

Trane XR95 ~2.2V at Thermostat Woke up this morning to a cold house and a thermostat message saying “no power to the Red wire.” Measured R and C using a multimeter and it reads ~2.2 Volts. Took the ...
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Oil Hydro Air & Heat Pump Efficiency

We recently moved into a 5 bedroom home in central Massachusetts with the following system that was installed in 2006: 3 zone hydro-air heat with Veissman Vitorond 100 boiler and Riello 40-F5 burner. ...
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Installing Nest Thermostat 3rd Gen with Power Adapter to Honeywell HZ311 Zone Controller

I’m attempting to hook up my Nest 3rd Gen thermostat to my zone controller and everything appeared to be working correctly. However, after turning the system back on and cycling through heat and cold, ...
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Heating and Cooling controlled via one thermostat

I currently have two thermostats. 1 for heating and 1 for cooling. The heating one stopped working recently and now that winter is coming, I am interested to combine them into one. Here is what I have ...
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Existing doorbell has only A1 and A2 wires -- want to replace with different smart doorbell

I'm replacing the doorbell in the house I just moved into. Currently, there is some Aiphone setup (never heard of this). What I do know is that the current doorbell camera has two wires (A1 and A2) ...
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Nest thermostat tripping breaker

I have had the nest for about 3 years, it's been working fine. Over the past month the breaker that feeds the nest and the furnace has been tripping although the heat hasn't been used for about 4 ...
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Can’t find C Terminal Burnham Series ES2

Try to install Nest thermostat 3rd gen. I have 3 wires coming from the furnace: R, W, and G. I connected them to Nest pretty simple there, but low battery, Wi-Fi not working on a daily basis. There is ...
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Mechanical doorbells (connected to NEST doorbell) won't stop moving

I have two Nest doorbells that I view through Google Home. Both are connected to mechanical doorbell ringers and both of those ringers are constantly in motion. See the pictures attached. The small ...
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Re-wire Aprilaire to non-communication/legacy for Nest

I currently have an Aprilaire unit 8840. I know the system is proprietary, but I also believe I can rewire the control box and re-wire it as non-communicating thermostat and use a Nest instead. I've ...
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Thermostat connection and NEST compatibility question

We have this thermostat. It's no longer allowing the temperature to be adjusted. It will control the furnace on/off, it just won't allow the temperature to be adjusted. Date & time are still able ...
AIVAS001's user avatar
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How do I go about wiring 3 Nests to a boiler with no C wire

I’ve seen a version of this question in a few places but nothing really fits. I have a boiler and hot water baseboards. It’s a three zone system and I installed 3 Nests but there is not C wire and no ...
Unhuman's user avatar
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What is correct Nest setting when adding my own C-wire? (i.e. without using Nest Power Adapter)

I am adding a Nest (not Nest Thermostat E or Nest Learning Thermostat) to a 2-wire boiler system. Fortunately, the existing thermostat wire has free conductors. So I connected a 3rd wire from the C ...
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Furnace not working after installing nest thermostat [closed]

I installed nest thermostat without turning off power to furnace. Blower kicks on but not furnace. Is there anything I can do?
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How do I add a second Google Nest Thermostat to control a single furnace?

I currently have a Google Nest Thermostat downstairs, and it works fine. I want to add a second thermostat upstairs and then have it 'learn' that I sleep upstairs so it should adjust the temperature ...
myermian's user avatar
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2 votes
3 answers
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How to add Thermostat C Wire to Furnace TH/TR and Transformer

I am trying to figure out the proper wiring for a C wire for my thermostat. My 24v transformer and the current thermostat wiring at the furnace are shown in the pictures below. Can I wire a thermostat ...
Chris Peterson's user avatar
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168 views

Thermostat two-wire: heat-only with R+Rh and O/B

Updated Dec 1, 2022 (Previously I wrongly believed that the boiler is connected to a heat pump, whereas it is actually connected to a temperature sensor installed under the heat pump) I want to ...
CluelessAboutDIY's user avatar
2 votes
1 answer
666 views

Help Replacing White Rodgers 1F866-344 Thermostat with Nest

I have a dual zoned Heat Pump system in my house. Each zone is controlled by a White Rodgers 1F866-344 Thermostat. I took a picture of the connections (there are 8 wires in use) and would like to ...
Floyd Schleyhahn's user avatar
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Help identify common wire on furnace

I need to install a nest power connector for my furnace (only equipment present) and am trying to identify the c or common wire. Pic of board and transformer (?) below. Thank you Edit: better pics ...
bikeactuary's user avatar
3 votes
1 answer
279 views

Google Nest Causes Furnace to Need Reset

After installing a Google Nest, my furnace heats until it reaches the correct temperature, but if it sits, the controller light turns off and I need to turn the breaker off and then back on in order ...
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How is this working? There is no W,Y,G wires?

Single stage gas furnace and ac w Honeywell thermostat w no W,Y, nor G. How would this work? I’m trying to convert to nest.
Mon's user avatar
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Replacing doorbell transformer attached to electrical panel

I've been pulling my hair out trying to find my current doorbell transformer in order to upgrade it for a nest doorbell. I believe to have found it attached to my electrical panel after taking the ...
Eric Tercasio's user avatar
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1 answer
74 views

HVAC wont turn on heat

I recently installed NEST thermostat and the cooling aspect was Ok, however now when i turn on the heat, the thermostat says its heating however there is still cold air coming thru the vents. After ...
Sri's user avatar
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1 answer
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I have an old boiler with no "C" terminal for wifi thermostat

I have a nest thermostat that need a C cable. I have a Vaillant boiler serial number GA92-120 SP that doesn't have a C connector. The boiler has only two wires connected from the thermostat to the ...
Lunna J's user avatar
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2 answers
674 views

Connecting “C” (common) wire for Nest thermostats

I am planning to get two Nest Thermostats for my 2 zone HVAC system. It looks like blue C wire is already there for both thermostats, but not connected (existing thermostats run on batteries). I ...
Cube's user avatar
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Install C wire on dual zone hvac board for Nest - no c wire terminal

I am trying to setup a Nest Thermostat and I am getting a few errors when trying to set it up. I am getting errors that no wires are detected on the Nest even though the old thermostat is detecting ...
anijjar's user avatar
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I'm installing a nest thermostat. The wires at the base are R G Y W

On my 24v transformer there is a C POST. I have wired the nest thermostat with the 4 wires R Y W G. Nest says the termostat needs a c wire,Can I just run a wire from the C post on the transformer to ...
Dom's user avatar
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2 votes
1 answer
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Could my Nest thermostat be reducing my AC cooling?

I have a Nest thermostat wired up to a furnace and AC that was installed 5 years ago (a Byrant 987m furnace, Byrant 126b AC). Both the AC and furnace work, but when the AC is running, air barely blows ...
Terence's user avatar
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Replace Honeywell TH9320WF5003 with nest 3rd gen

Need help with identifying wires on Honeywell TH9320WF5003, using Nest compatibility checker to replace with Nest gen 3
Ed Fulkerson's user avatar
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2 answers
779 views

Nest Installation Wiring [duplicate]

Hello trying to wire a Google Nest Learning Thermostat and my old one used only VG and V+ and now I need to know what I should hook it to.Also I have 3 others wires that weren't hooked to anything in ...
Dani's user avatar
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No C wire for Nest thermostat but unused C terminal on furnace

I know this question is similar to others I’m just hoping for a short answer. It’s a small house and the thermostat and furnace might be twenty feet apart. The control board on the furnace has an ...
Hawkward PDX's user avatar
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Nest C-wire issues with old boiler, xfmr, and 8124 aquastat

I have my C & Rc connected to my old 28vac xfmr and my W & Rh directly to T & T on aquastat. I added the Rc so the Nest would stay active in Summer when boiler is turned off. This setup ...
Ron C's user avatar
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1 vote
2 answers
3k views

Can I use this unused blue wire as my C wire for my new Nest thermostat?

I am a bit confused with my furnace wires. I did some research and watched a bunch of YouTube videos on how to install the Nest thermostat. I currently have a normal digital Honeywell thermostat. I ...
Sharikh Khan's user avatar
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148 views

Nest thermostat E keeps running

I have a nest thermostat E for a year or so, but recently it feels like it keeps running for a a prolonged time when the vent is not venting hot air anymore, worth to mention is that, it DOES bring ...
diabloooo0's user avatar
2 votes
1 answer
378 views

Installing Nest Smoke Alarm against capped wires

We moved in to a new home and the prior homeowner capped the old smoke alarm wires and replaced the old wired alarm with a battery unit that wasn’t wired up at all. The nest smoke alarm has a 120V ...
M2tM's user avatar
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3 votes
2 answers
5k views

How do I replace my old Honeywell thermostat with a Nest?

Just moved to a 1985 built house in Ontario, Canada that has a Honeywell thermostat that I'm trying to replace with a Nest. I am unable to understand the labeling of the current thermostat as the ...
eszed's user avatar
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Adding New External 24v Transformer to Nest with separate Rh and Rc wires

I have separate heat and cooling systems with wiring to Y, W, G, Rh and Rc (see below). For the external transformer, where do I attach the two wires. C and ?
Richard's user avatar
2 votes
0 answers
598 views

How to wire a 2 stage heat pump with gas furnace

I bought a new house last year and this is the first winter I've been in it. It have a gas furnace that we've been using as the only heat source. The other day, I went to clean the condensor coils and ...
Andrew Scott's user avatar
1 vote
1 answer
96 views

Would it be dangerous to tap an existing flame sensor circuit to create a common connection for my thermostat?

I'm considering using this answer to connect a common wire to my thermostat. I have the exact same setup, and have verified with my multimiter that the red T terminal outside F terminal beeps, while ...
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