Questions tagged [nest]

The Nest is a programmable, internet-enabled thermostat

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Doorbell transformer is this it?

I am going nuts trying to find my doorbell transformer. Someone suggested it may be this. But doesn't look like one to me. Is it? If not any suggestions where it may be?
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5 votes
3 answers
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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 ...
OldLynx6348's user avatar
5 votes
2 answers
11k views

Why is my indoor A/C Blower randomly turning on and off only with Nest?

I recently purchased a Nest Thermostat (3rd Generation). My old thermostat was working perfectly. I wired Nest the Same exact wiring as the old thermostat which is : Y1 W1 G RH RC. With Nest, the ...
Jayy's user avatar
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4 votes
1 answer
29k views

Furnace blower motor runs briefly then turns off

I have an Amana AMH80804BN with a Nest thermostat (wires Y,C,Rh,W,G) and a 3 ton AC. I have been having issues with the AC portion the furnace (heat) seems to work fine. The AC will start out the day ...
Chris Yoakem's user avatar
4 votes
2 answers
1k views

Why won't my thermostat control the HVAC anymore after trying to switch thermostats?

I bought a new Nest thermostat which is supposed to be compatible but needs a professional installation (advice that should have been heeded by non-professional electrician me). This is to replace an ...
justanotherguy's user avatar
3 votes
5 answers
6k views

Nest Protect Expiration Date

I just bought a set of Nest Protects and after opening the first one I noticed that its manufacture date was almost a year ago and that the expiration date was 10 years from the manufacture date, not ...
dlu's user avatar
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3 votes
1 answer
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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 ...
Correllion115's user avatar
3 votes
2 answers
4k 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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3 votes
3 answers
3k views

Nest thermostat causing condenser unit contactor to chatter when NOT calling for cooling

I have dual transformers, separate heating and AC. I've recently installed a nest learning thermostat (3rd gen). This is my wiring. The c wire comes from the the transformer on the AC side (pairs ...
David Li's user avatar
3 votes
3 answers
16k views

Do I have one or two 24V transformers in HVAC control circuit

I have two old thermostats (one for heating, the other for cooling) that I would like to replace with a single Nest E unit. I have central air and gas heating. Cooling thermostat has the following ...
John's user avatar
  • 31
3 votes
2 answers
3k views

How to add C-wire from Laars mini-term

Folks, I am having problems connecting my Nest thermostat to a boiler. Given Laars Mini-term JVS series with Temperature Control PCB Module (pictured below) When I short Com call and Heat call wires ...
bioffe's user avatar
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3 votes
1 answer
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Why won't my Central Heating Boiler turn off with Nest thermostat installed?

I bought a second hand Nest Thermostat v1 (the European model with heatlink). I installed it and the Thermostat seems to work. The central heating boiler (Vaillant hrPRO CW3 VHR NL CW 3/3) seems to ...
Bob Ortiz's user avatar
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3 votes
1 answer
2k views

How do I add a "c" wire to the boiler for a Nest thermostat?

I have a Lennox wall mounted boiler (gwm 075ie), I am trying to connect a "c" wire so I can install nest thermostats. I have 3 zones, currently running 2 wires (r&w). There is an extra ...
new techy's user avatar
3 votes
1 answer
2k views

How do I get the Nest Thermostat to warm up my house prior to arrival

I have a Nest Thermostat and live in the UK. I have a radiator based heating system. When I leave the house, some time later the Nest realises this and sets my house to Away. From this point onwards ...
Chris Terry's user avatar
3 votes
2 answers
12k views

How should my third-generation Nest thermostat be connected?

I have an old Honeywell Q674 thermostat with mercury in the house we just moved into. I'm attempting to upgrade to the nest 3rd generation thermostat, however the wiring labels are VERY different. ...
user73751's user avatar
3 votes
1 answer
950 views

Will a 3rd Generation Nest thermostat correctly adjust the humidity base on outdoor conditions?

If I plug my whole house humidifier into a 3rd generation Nest, is it smart enough to track outdoor temperature and adjust indoor as needed to keep condensation off the inside of the windows?
David's user avatar
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3 votes
4 answers
14k views

Is the Nest thermostat smart enough to turn itself on BEFORE you get home?

I'm wondering if in "Away" mode, is Nest smart enough to learn about when you come home, and kick on approximately 30-40 minutes BEFORE then? Or does it only kick on when it senses you've come home? ...
AgmLauncher's user avatar
3 votes
0 answers
989 views

Can someone assess my original thermostat's wiring setup?

This is a new world for me, I haven't messed with circuits since physics 101. When I watched a quick youtube tutorial on setting up my Nest E, I thought it'd be a simple "move wire in old C, to new C ...
Chris's user avatar
  • 31
2 votes
1 answer
485 views

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 ...
Sam F's user avatar
  • 21
2 votes
2 answers
18k views

One of two Nest Thermostats won't run Fan Only, fan runs with heat though

We've got two Nest Learning Thermostats (3rd Gen) running two separate heating and cooling units in an office. They both work fine for heating and cooling, with one exception: one unit will not turn ...
jeffhot's user avatar
  • 53
2 votes
1 answer
231 views

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
  • 145
2 votes
1 answer
340 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
  • 123
2 votes
2 answers
4k views

Installing Nest From HoneyWell T8575D Condo 8-Wire thermostats

My condo apartment current has the HoneyWell T8575D installed and I want to switch to Nest. But I couldn't find which Nest port should the "Fan Common" line go into. The wiring from the wall ...
HarryQ's user avatar
  • 141
2 votes
1 answer
6k views

Nest, Blue Wire, W1 and W2

I just got a Nest E thermostat and I'm trying to hook it up. There is a blue wire that I had assumed was the "C" wire, but looking at the furnace, it doesn't look like that's the case, as the blue ...
Pete's user avatar
  • 21
2 votes
2 answers
5k views

Nest Thermostat Wiring for Baseboard Heaters

I'm using a Nest Thermostat to power baseboard heaters (240VAC). I have 4 wires that I have access to: 2 wires: Red/Black from a transformer which outputs 24VAC 2 wires: 24VAC from a thermostat ...
Nick Lang's user avatar
  • 123
2 votes
3 answers
2k views

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
2 votes
2 answers
12k views

Adding a C Wire using a 24V AC Transformer to a 2 Wire Heating System for Nest

Continuation from Can I use any of my existing oil control terminals (TTFFAA) for a C wire? EDIT: Wanted to finally say this is SOLVED with help from @JPhi1618 (see conversation below). If you have a ...
Teuszie's user avatar
  • 33
2 votes
2 answers
2k views

Adding Venstar Add-a-wire ACC0410 to HVAC with Nest Thermostat E

I purchased a Nest Thermostat E and found that I don't have C-wire. With the research, including adding venstar to HVAC and Youtube video by Venstar, I tried to add c-wire to my Nest Thermostat E with ...
Jong Lee's user avatar
2 votes
2 answers
14k views

Why is Thermostat Y wire connected to C terminal on furnace?

I have a Nest E thermostat, and like many others have lost wifi and getting low battery because I have no common wire connected. After looking at my old Lennnox 78ugf3-75-1 furnace, I noticed that my ...
DJ2904's user avatar
  • 23
2 votes
2 answers
1k views

Can I pull a common wire off an evaporative cooler transformer relay?

I have a Nest thermostat currently controlling a LP furnace. The old thermostat didn't have a common wire connected, but there was a an extra wire in the bundle and a common terminal on the furnace ...
Matt's user avatar
  • 183
2 votes
1 answer
90 views

Upgrading from a two wire analog tstat to a Nest, need help

I am looking to upgrade from an old analog tstat to a Nest. My old stat had only two wires connected (R and W) but the wire bundle had three. So I tried connecting the green wire to C and then turned ...
Chris's user avatar
  • 41
2 votes
2 answers
604 views

Nest E Thermostat Power

My thermostat is in the basement, connected to a Honeywell R845A to run a circulating pump for heat. I bought an Nest E for the main house and it works great. I want to replace the thermostat in the ...
Tstatguy's user avatar
2 votes
1 answer
84 views

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 ...
DougSlug's user avatar
2 votes
1 answer
476 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
2 votes
1 answer
466 views

HVAC: adding a C wire for Nest thermostat

Just installed a brand new gas boiler, want to keep using my existing Nest thermostat (they are compatible according to Nest). Current system only has two wires: Rh and W Nest is designed to steal ...
jqwerty's user avatar
  • 31
2 votes
1 answer
6k views

No power coming from c terminal on furnace

I am trying to set up a nest. My system was a simple heat only R/W wire set up. I attached the green wire to the c terminal on my furnace, but no power is being fed from it, or at least the Nest is ...
AdamG's user avatar
  • 297
2 votes
1 answer
625 views

Help with a Nest E install on a old HVAC system

Hello I am trying to replace this thermostat with a Nest E but this has proven more complicated than I thought: I plugged all the cables to the nest adapter and figured that the blue wire which wasn'...
Ayle's user avatar
  • 23
2 votes
1 answer
3k views

Connecting Common Wire from thermostat to Air Handler

My apartment has a central heating/cooling HVAC system consisting of a gas-fired hot water heater which feeds hot water to a First Co air handler for heating, and a rooftop compressor which feeds ...
SSilk's user avatar
  • 263
2 votes
1 answer
231 views

Nest thermostat to Kelvinator furnace

My old thermostat had 4 wires. I replaced with a Nest thermostat. At times the AC condenser is running but the furnace blower is not running. Found other with this and they said need to add common ...
Scotte's user avatar
  • 21
2 votes
2 answers
19k views

Nest Thermostat - Not cooling

First warm weather using my nest thermostat and now trying to use the central air. However, only the fan turns on and it doesn't actually cool no matter how long I run it. (It worked perfectly in the ...
ETedford's user avatar
2 votes
1 answer
2k views

Can't get 3rd Gen Nest to power fan on Trane XR95 furnace

I have a Trane XR95 furnace and I replaced my original Honeywell Pro 4000 thermostat with a 3rd gen. Nest. I noticed, however, after installing the Nest that I can't get the fan to run on its own ...
FilmiHero's user avatar
  • 121
2 votes
2 answers
2k views

Help wiring a Nest thermostat in an unusual situation

The attached picture shows my current wiring. Notice there are two thermostats. The top one (Carrier, with four conductors) controls hot air heating. The bottom one (with two conductors, old mercurty ...
Wynne's user avatar
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2 votes
2 answers
13k views

my furnace fan stays on even when at temperature

I recently installed a 2nd generation NEST thermostat. I'm not home very often, but I was paying particularly close attention to the furnace after installing this thermostat and I noticed that the ...
gillyspy's user avatar
  • 121
2 votes
0 answers
67 views

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
2 votes
0 answers
164 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
0 answers
546 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
2 votes
0 answers
237 views

Nest Thermostat wiring for heat pump

I am trying to replace my Honeywell Thermostat that is connected to a Honeywell EIM with a Nest Thermostat. I only have a 4 wire (G,B,R and W) ran from the EIM to the thermostat. My understanding is I ...
Jon Erickson's user avatar
2 votes
0 answers
2k views

Thermostat not getting power (Nest E74)

I replaced an old Honeywell thermostat about a month ago with a Nest thermostat. Friday Nest started displaying an E74 error. I have two furnaces and two outdoor units, one for upstairs and for ...
Somewhat Insane's user avatar
2 votes
0 answers
65 views

I have 2 wire going into R, how should i connect to nest?

I'm installing a Nest thermostat: How do i connect the blue and red wire? Nest tech said i have two transformer.. do i split them into RH, and Rc?
steve's user avatar
  • 21
2 votes
0 answers
3k views

Is Nest 3rd Gen Thermostat compatible as a replacement for Honeywell TH3110D1008

I have an Ultra-Zone EWC-ST-2E controller unit for my gas AC unit at home (heating and cooling). It is set for two zones. Where the first zone has to be on (heating or cooling) in order to enable to ...
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