Questions tagged [nest]

The Nest is a programmable, internet-enabled thermostat

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25 views

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 ...
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C-wire nest to burnham boiler

Connecting nest learning 3rd gen to burnham series 2 model 203 boiler. I am only using the system for heat. I have three wires at the thermostat R,W and an unused green that I would like to turn ...
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40 views

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 ...
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55 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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41 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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70 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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41 views

Nest Thermostat

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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49 views

Nest snow thermostat with a McLain PEG-45 boiler

I have a similar problem . 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 confusing since the red ...
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66 views

Need suggestions about installing nest hello doorbell with no existing wires

I bought a nest hello doorbell and then just realized my existing doorbell is wireless... And also an interesting thing is inside the house, in addition to those wireless chimes plugged on outlet, ...
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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 ...
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32 views

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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1answer
121 views

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 ...
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“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 ...
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Connecting blue “C” wire to gas furnace, but furnace already has white wire?

sorry if this is a stupid question but I'm trying to install a smart thermostat (Nest). I realized that while there was an unused blue "C" wire behind my old thermostat, it was not connected ...
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78 views

Can I use 1 Nest Thermostat with 2 boilers?

I have 2 boilers in my house. 1 is for the main house and the other one is for the annex which is built a few feet away from the main house. My 1st boiler is connected to Nest thermostat. Can I ...
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693 views

Nest thermostat heating way beyond set temperature

I installed a new (2020 model) Nest thermostat, which is replacing a basic battery-powered Honeywell thermostat that we had. The wiring is W/R/G/Y. The Nest thermostat keeps heating WAY beyond the ...
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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 - ...
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Nest Heat Link E wiring [duplicate]

Moderator, please don’t simply close this question of the other question asked wasn’t the same, and the answers weren’t applicable. That was sort of thoughtless. Thank you in advance - anyone who can ...
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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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1answer
70 views

How to connect fan coil (condo) wiring with Google Nest

My old thermostat wiring looks like this: So its good I have a C wire and its running on 24v. The hard thing is the fan control. It's a proprietary 3 speed fan - where do I wire those 4 wires to? ...
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1answer
365 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 ...
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1answer
133 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 ...
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181 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 ...
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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?
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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 ...
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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 ...
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156 views

Where Can I connect my C-wire on A Hot Water (Hydronic) Heating System?

I have a hydronic heating system (Lochnivar)that came controlled with an older (dumb) thermostat. I have 5 wires behind the wall and 5 wire in the wire packet going into heating system however only ...
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31 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 ...
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47 views

How to connect nest thermostat e for American standard heat pump 2005

current wining We have a 2005 heat pump. I tried b wire to nest C wire but it is not working
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3k views

Nest Thermostat says “delayed” and never turns AC on

New Nest, replacing an old thermostat. Image of old setup: Nest setup: The Nest says "cooling" with the blue screen for about 1 second, then switches to "delayed", then just ...
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272 views

Where to connect C wire if no C terminal

Hi wanting to connect Nest and want to install a C wire. HVAC only appears to have G,W,R so not sure where to connect C.
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538 views

Connect separate Heat / AC systems to a Nest E

I have oil/hydro zoned heat, and a separate AC system. I have Honeywell ProSeries thermostats that have some 16 wire connectors (apparently designed to handle a nuclear power plant or something). I ...
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2answers
576 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 ...
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84 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 ...
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578 views

Rewiring for Nest Thermostat - Current ABCD Configuration Carrier

So I would like to use a Nest thermostat on my carrier system. I have the ABCD wiring configuration from current thermostat to the board on the furnace. On the attached image, you'll see three brown ...
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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 ...
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Carrier fb4cn030 with nest

Looking to hook up my AC to Nest. Old thermostat had VG and V+ at thermostat.i ran new 5 wire from unit to nest. I believe I need Y1, G ,RC but where do I get it from my unit. I see there's an ...
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71 views

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 ...
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1answer
2k 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 ...
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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....
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2answers
162 views

Trouble with identifying wiring for heat pump setting up Nest

The home I moved into has a Honeywell thermostat controlling an Amana heat pump. I am trying to replace this with a Nest thermostat instead. Here is a photo of the wiring for the existing thermostat ...
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1answer
311 views

Installing a Nest thermostat without a C wire?

I am attempting to install a nest but do not have a common wire on my hvac unit, perhaps it is slightly dated. I have read that on older units the O terminal is the same as C and I can remove the ...
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4k views

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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1k 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 ...
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549 views

How do I wire a/c if furnace wiring compartment has no y terminal?

I have been trying to figure this out for more than a year. All was running until HVAC company came to replace 2 thermostats with nest and rewired 2 HVAC units (a front of house and a back of house ...
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225 views

Checking my understanding - How to add C-wires for smart thermostat install x3

I'm in the process of installing some smart thermostats (Nest Thermostat E) to replace my old ones. I have a boiler radiator heating system with three zones. Two zones are straightforward heat only (...
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106 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 ...
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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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2answers
3k 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 ...
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1answer
56 views

Add “C” wire to NEST

I have a NEST thermostat. My heating and cooling system is in the attic.I need to add a "C" wire to the control board, but I can't find out where I need to open the unit in the attic to see where the ...