Questions tagged [nest]

The Nest is a programmable, internet-enabled thermostat

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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 ...
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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 ...
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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 ...
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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 ...
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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
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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 ...
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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 ...
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0 answers
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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 ...
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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 ...
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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 ...
1 vote
1 answer
100 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 ...
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3 votes
2 answers
1k 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 ...
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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 ?
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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 ...
1 vote
1 answer
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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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Nest 3rd gen Learning Thermostat install help

I am currently looking at installing a nest 3rd gen to my current Worcester Bosch 30SI compact combo boiler. I currently do not have a thermostat and the combo boiler is controlled by a Honeywell ...
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1 answer
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Thermostat replacement, no c wire

I have an almost 20 year old Taco thermostat that I am trying to replace with a Nest thermostat for a forced hot water heating system. The Nest requires a W, R, and common wire, current only uses W ...
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137 views

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 ...
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1 answer
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Nest thermostat issue - only blows hot air if heat is on and fan is forced on. No air circulation with heat only

A few months ago I installed a nest thermostat and everything worked fine. I ended up giving that one away and installed another one A few days ago. It worked for one day and then it stopped heating. ...
-1 votes
1 answer
30 views

C wire contact missing at boiler

I have a heat only system. My previous thermostat only use the red and white wire. The blue C wire was coiled up and unused. I purchased a new nest thermostat. Everything is wired fine at the ...
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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 ...
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Nest and ZVC404-4

I am trying to update my thermostat to Nest. Get 4 Nest but could not get it working at all. The HVAC control board actually have C-wire (it was not used previously, I connected it when I start the ...
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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 ...
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-1 votes
1 answer
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Where should I connect the E wire on my Nest Thermostat?

I am trying to install a Nest thermostat and I have (R, O/B, Y, G, E, W2, C) wires in my old thermostat, but the Nest only has (Y, C, W, G, R, *OB). So where do I connect the E wire if there isn’t a ...
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2 votes
2 answers
824 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 ...
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1 vote
1 answer
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OK to use this C-wire in old boiler for Nest smart thermostat?

I have an old heat-only gas system with radiators, the boiler is a Willaimson-Thermoflo GWA070NS. I'm trying to install a Nest thermostat but only the R and W wires were in use with my old one. There'...
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0 votes
1 answer
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Installing a Nest Thermostat can't find circuit board

Hello so recently I have been wanting to install one of these nest thermostats into my home and realized I didn't have a C wire and it was recommended to install a google nest power connector, the ...
1 vote
2 answers
78 views

C wire possibly on my boiler/heat pump

Hey so I know this is annoying and asked way too often but the wife wants a WiFi thermostat and of course I don’t have a “c” wire hooked up and there is no “c” terminal on my control board. We have ...
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1 answer
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Furnace has G (Fan) terminal but no wire can I connect it to my thermostat?

My goal is to add support for my furnace fan on my Nest Thermostat. Looking at the furnace the board has many terminals, but not all are connected. Can I connect the G terminal to the G terminal on my ...
1 vote
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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 ...
1 vote
1 answer
448 views

Nest Thermostat Wiring problem - Heat does not work

I recently replaced my old American Standard thermostat with Google Nest. Cooling works fine but Heat does not work and simply goes into an unending loop of 'delayed: will start in 2:30 secs' I think ...
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1 vote
1 answer
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How to turn a Nest or Nest-E thermostat to completely off (no power, no battery)?

Is it possible to remove the battery, or otherwise turn a Nest thermostat completely off, for times when there is no power to the furnace? This is to avoid draining the battery in the Nest completely,...
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1 vote
2 answers
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Installing c wire in older furnace

I just installed a nest thermostat and need to hookup the c wire inside the furnace. I read where you need to connect the c wire to the secondary wire on the 24v side of the transformer. There are 2 ...
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1 vote
1 answer
32 views

HVAC common wire

I have a nest thermostat connected to baseboard hot water and central air. I'm looking to add a C wire to the nest for constant power. Can someone confirm if I should connect blue to to brown from the ...
1 vote
1 answer
56 views

What will i need to remove Nest's from home?

I just moved into a house that has Nest temperature controllers in both the upstairs and downstairs. I don't plan to have any wifi in the home and I want to replace Nest with hvac controllers that ...
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2 votes
0 answers
134 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 ...
1 vote
0 answers
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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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1 vote
1 answer
204 views

Nest needs C wire - Goodman PGB024075-1

Complete novice here trying to install a Nest thermostat in our new home. I hooked everything up according to the Nest guide, but the thermostat gave a power/battery error message. I've gathered that ...
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777 views

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 ...
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1 answer
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Nest thermostat and old HVAC

Last year the Nest (used only for cooling) was working after connecting the blue C wire to the HVAC. Last year I made it work only after I put the green wire for the fan in ob. Now, when the green ...
1 vote
1 answer
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How do I determine which is my common C wire?

I am trying to install a Nest Thermostat and I need some help locating which of the wires would be the common "C" wire. I have traced all the wires going from the thermostat, condensate ...
1 vote
1 answer
434 views

I accidentally short the c wire and both units not turning back on

I was trying to installed my nest thermostats.the power were shut off but it seem some current still in, so it short the system my question I can't located the fuse on the board so is that mean the ...
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2 answers
91 views

C wire possible for Nest thermostat?

I have a Nest Learning thermostat. Recently, it has caused a clicking sound to emanate from the furnace area whenever the system is powered off. I've determined this is due to the thermostat drawing ...
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1 answer
943 views

How to wire a smart thermostat with dual Transformer system? R , Rc, W , Y , G. No C wire. No Jumper

Is this system considered a Dual Transformer system? According to Nest since there is a R and RC cable it must be a dual transformer. But they were unsure and I don't know what that means! I don't ...
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1 answer
245 views

Nest Thermostat install for steam boiler

Just received a Nest thermostat I would like to install. My system is a McLean boiler steam to radiators. My existing setup has a 2 wire thermostat connected to boiler. From thermostat the R wire goes ...
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1 answer
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Nest snow thermostat with a McLain PEG-45 boiler

I have a problem similar to the one in this question. My R wire from the thermostat to the G terminal on boiler and the W wire from the thermostat to the Y terminal on the boiler. The picture is a bit ...
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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 "...
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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 ...
1 vote
1 answer
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Where should I put the Google Nest smoke alarm in this room?

I have a large open plan kitchen dining and living area with a high vaulted ceiling. The ceiling meets two separate one-sided peaks in two places on the wall. I'd like to put a single Google Nest ...
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1 vote
1 answer
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2 wire smart thermostat nest but no RC or RH

I just got the new 2020 model nest and i was going to do the 24v transformer suggestion in other thread but these new models do not have RC or RH on them. they only have Y,G,R,W,C,O/B. Will the ...