Questions tagged [nest]
The Nest is a programmable, internet-enabled thermostat
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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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2answers
51 views
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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1answer
23 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 ...
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1answer
50 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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0answers
27 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 ...
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0answers
34 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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1answer
72 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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0answers
206 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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1answer
118 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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42 views
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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1answer
51 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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1answer
106 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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2answers
50 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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1answer
169 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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1answer
49 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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1answer
53 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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0answers
97 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 "...
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43 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 ...
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1answer
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
215 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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0answers
19 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 ...
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1answer
107 views
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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3answers
112 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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3answers
1k 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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0answers
17 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 - ...
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25 views
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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0answers
121 views
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
98 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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2answers
743 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
176 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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0answers
415 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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21 views
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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2answers
651 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 ...
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34 views
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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1answer
204 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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41 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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1answer
5k 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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1answer
558 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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1answer
1k 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
1k 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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0answers
130 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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0answers
772 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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0answers
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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0answers
88 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? [
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1answer
4k 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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0answers
79 views
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
324 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
344 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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3answers
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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1answer
2k 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 ...
