Questions tagged [nest]

The Nest is a programmable, internet-enabled thermostat

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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 ...
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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 ...
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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
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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 ...
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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 ...
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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 ...
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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?
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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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2 answers
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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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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 ...
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Anyone connect the MasterStat Model 110423-2 three lines to Google Nest thermostat?

I have read the poster here: Controlling 110v swamp cooler using Nest thermostat about how to control the swamp cooler using the nest. However, I don't have reputation to post comments to that post ...
River Seow's user avatar
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Want to add a C-wire to a ClimateMaster Compact Heat Pump in combination with a Nest learning thermostat

My existing Nest learning thermostat, 3rd gen, is draining the battery really fast when use the wifi. I have a ClimateMaster Water Source Heat Pump. It has only four wires. I run an extra wire to ...
Marina Smith's user avatar
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406 views

Confused about HVAC wires

My townhome is using a heat pump and it's currently connected to a honeywell 3000 thermostat. I bought a gen 3 nest and from what I can tell, it's compatible. However, I'm a bit confused about my ...
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Problems w/ Nest

I've got a common problem but I can't seem to find the simple answer. My heating system is simple. Forced water oil boiler with three zones. Two zones are controlled by the Nest E Thermostat. I'm ...
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Horstmann C27 to Nest

I'm in progress of changing Horstmann C27 with Nest Learning Thermostat Gen3. I'll share the images below, I'm looking for a way of mapping the cables to the Nest. C27 supports both Hot Water and ...
Mavi Domates's user avatar
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Google Nest doorbell install - 6 wires

I’m trying to install a nest video doorbell, however I’m unsure how to wire it up as I cannot find a relevant wiring diagram. I have a Friedland 106 doorbell with one doorbell button at the front door....
Web_ster's user avatar
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2 humidistats for 1 humidifier

I have two zones in my house with a damper system and want to move away from using my humidistat to control the solonoid valve on my humidifier and instead use my Nest thermostats. My zone control ...
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Hookup Nest Themostat & Heatlink

I'm in the UK and trying to install a Nest Thermostat & Heatlink at home to control my hot-water and central heating and I'm having a few issues working out how my existing setup works so I can ...
ChiefScout's user avatar
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Nest Thermostat E wiring with a C-wire adapter

I wanted to get a Nest Thermostat E, but my current thermostat doesn't have a C wire. From what I read online, it's better to use a C wire, so I was considering adding a Venstar Acc0410 adapter. ...
mrhollywoodgates's user avatar
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Thermostat has two wires going into C terminal

Trying to help my dad install his new Nest thermostat - for some reason his thermostat has two wires going into the C terminal. I've searched and cannot find any other question about a setup like ...
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How can I use home automation with hot water heating radiators?

My apartment (in a condo building) is currently using stationary PTACs (using electricity and hot water), which I'm planning to replace with a split-level A/C system (for cooling) and hot water ...
Alexander L. Belikoff's user avatar
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351 views

Nest + opentherm + zone valve

I have a Nest 3G, I'm now considering to change my boiler due to age-related issues. Can someone tell me if I can connect the Heat-Link to both zone-valve (on/off contacts) and boiler (OpenTherm). I ...
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Smart Thermostat (Nest, Honeywell or Ecobee) from KMC wiring?

I moved into a 1br condo recently and was looking to update the thermostat to Nest (or other Smart home thermostat). The current thermostat model is KMC and when I took off the casing, the wiring does ...
user81427's user avatar
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Running Airwave/Fan schedule with Nest (With Fresh air intake HVAC)

I am trying to make sure I am understanding the research/studies behind using just the fan to help reduce energy to cool/heat home. Nest has the option to set a schedule to run the fan in home to ...
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Nest thermostat - electrical buzzing/humming noise

I have recently installed two nest thermostats (the black gen 3, and white model E). The system is gas radiator heat wired to the model E via the usual Rh and W wires, and Rh, Rc, Y, G, W wired to the ...
John's user avatar
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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 ...
Joe's user avatar
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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 ...
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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 ...
Sher's user avatar
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698 views

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, ...
zeropsi's user avatar
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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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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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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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107 views

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 ...
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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
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1k views

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
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I have a Nest 3rd generation thermostat and it wont turn on the furnace

I have a Nest 3rd generation thermostat and it wont automatically turn on my furnace i have to the nest to off then turn back to On to get the furnace to start. It was running fine for about 2 months ...
Patrick Renaud's user avatar
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892 views

Nest thermostat. No fan with heating

Here is how my Nest behaves with 3 different scenarios. My question is how can I get my fan to turn on automatically with my heat. Is it possible i have it wired incorrectly? Attached is my wiring ...
clennys's user avatar
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Nest 3rd gen thermostat N72 Error Does not detect Power from Rh wire

I just hooked my Nest 3rd gen thermostat to my split heating/cooling system with a Common wire coming from the air handler in my ceiling. On my old stat I didnt use a common because it was battery ...
Ken's user avatar
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274 views

How do I install a Nest Hello doorbell with no existing wires?

I bought a Nest Hello doorbell and then just realized my existing doorbell is wireless. Also, inside the house, in addition to those wireless chimes plugged on outlet, there is also one relative "...
diabloooo0's user avatar
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72 views

2020 google nest thermistat and no C wire for floor boiler heat

I think I have read all and still an issue. I purchased a 2020 google nest wifi thermistat for my floor boiler in the basement (it only has R, W, Y, C, G and OB). The existing only has two ...
user128463's user avatar
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36 views

"C" For nest g4cv thermostat

Weil McLain pcg-4 series 5...old thermostat was a Honeywell digital with batteries..I have 4 wires but only 2 were used red - R & green - W. It's a 2 zone hydronic system. There is a multi tap ...
Vito J. Del Re's user avatar
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27 views

Wiring a Nest Thermostat E where current thermo feeds 2 controllers

Moderator, please don’t simply close this question if the other question asked wasn’t the same, and the answers weren’t applicable. That was sort of thoughtless. Not helpful. Thank you in advance - ...
BertBushey's user avatar
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1k views

Thermostat wiring identification - missing yellow wire/extra wires

Help please and apologies in advance for lack of technical knowledge! I'm looking to replace my old Honeywell 8022C 24v thermostat with a Nest, and have failed on several levels now I've taken a look ...
Louise's user avatar
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new nest thermostat no c wire

I have a new steam boiler model uh1606hsid boiler, I recently bought a nest thermostat and battery keeps dying, is there a way to connect a c-wire to my boiler?
Anthony's user avatar
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148 views

Nest thermost not working with Rheem A/C C wire

My A/C unit was recently replaced. I have a Rheem RGEA14036AJT06XAB. The techs installed a pretty bare-bones thermostat since my old thermostat was reading 5 degrees off. So I decided it was a good ...
KreigD's user avatar
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Baystat240 to Nest

I’m trying to install a Nest thermostat. I currently have a Baystat240 installed. I have a heat pump with electric emergency heat. Can you tell me which wires will go where on the new nest? [![enter ...
Gary Henry's user avatar
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156 views

Intermittent Furnace Issue

So I have been having a bit of an issue with my furnace since installing the nest thermostat. The first day after I installed it was perfect. Everything was working. The second day I kept getting the ...
Fireurza's user avatar
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173 views

HVAC: Nest - Yet another 'C' wire question

I have a dual transformer system. At the AC/Blower unit, there are 'R_c', 'Y' and 'G' wires; there's 0VAC between the 'Y' and 'G' wires, and each shows 27VAC to the 'R_c' wire. At the boiler, there ...
AlmostSurely's user avatar