Questions tagged [thermostat]

Mechanical or electrical device used to control a heating, ventilation, and air conditioning (HVAC) system, or other temperature reliant system.

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27 views

How to control 120V power outlet with low voltage

I would like to power a 120V attic fan every time my AC comes on. The low voltage wire connecting the thermostat with the compressor (to control the compressor) runs through the attic (as the ...
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C wire for smart thermostat

I’m trying to add a smart thermostat and it seems I can’t find a C wire. I need to know where to tap in if I need to. It looks like I have extra wires on my thermostat wire going into the house.
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HVAC Gas furnace with added heat pump. Thermostat loses power while heating with gas

I have a medium efficiency gas furnace with an add-on Trane air to air heat pump. The heat pump kit is TAYPLUS103A. I noticed that in cold weather when the gas furnace runs, the gas ignites, and ...
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Web-based remote access of my Carrier Infinity thermostat and Flash end-of-life

I have a Carrier Infinity system, installed some 3 years ago. I was able to access the thermostat over the internet until very recently, because the web access feature uses the Adobe Flash Player ...
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Problem controlling propane free-standing stove with a millivolt thermostat

Heat only millivolt non-programmable thermostat stops turning propane stove on after 20 years. Stove turns on/off just fine using manual switch in back of stove. So I assume thermostat bad and replace ...
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Will a standard wifi enabled light switch between an indirect water heater and the furnace stop the heat call?

We have a Honeywell thermostat on an indirect water heater that ties to one of the zones on a furnace in a vacation home. I'd like to be able to stop the call to heat the water if the house will be ...
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Can I wire R from AC system and R from heating system to single R terminal on thermostat?

I want to replace existing thermostat that controls both heat and AC. There are two cables coming out of the wall. One goes to heating system with a red wire and a white wire, the other goes to to the ...
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1answer
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Can't get furnace to run in FAN ONLY mode

I can't figure out why my furnace is not working in FAN ONLY mode. It works fine when calling for heat, but when Fan is set to ON and there is no call for heat (or heat is turned off) the fan does not ...
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2 blue wires on furnace

Today I was trying to put in my smart thermostat and have had no luck. My old thermostat (pictured below) did not have a C wire connected but did have the wire behind the old thermostat. After the ...
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Letting a thermostat regulate temperature, or do it myself? [closed]

I always hear people say that it is more efficient to let a thermostat regulate the room temperature. Well, I do not have a thermostat, but I have an electric heater with on internal one. Not a exact ...
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Electric heat does not turn off when desired temperature reached

My electric heat (baseboards) do not turn off when the room reaches the desired temperature. It does turn off, however, when the thermostat setting itself switches (automatically if there's a schedule ...
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How to wire 7-wire thermostat and restart

We setup a sensi smart thermostat by combining the Blue and Orange wire into the O/B connector and Black to C. This had the heat and fans working but NOT cooling. We adjusted by trying to put Blue ...
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1answer
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Looking to modify behavior of aux heaters

In my condo I have a heat pump with electric strips for auxiliary heat. When the outdoor temperature is quite cold, the heat never turns off. It reaches the set temperature, but keeps running. When ...
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HVAC trying wire new thermostat old trane to new sensi smart touch

My old trane thermostat b modle # 3AAT80B1A1 has wires R red T tan O orange G green Y yellow X2 Black B blue U green W white new thermostat has RH power heating with jumper built in to RC cooling C ...
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What is causing my ac unit and thermostat not to work with one another

Inside unit and thermostat are not working properly. In the beginning, something needed to be changed in it,it was a small black box and a round cylinder like plug thing.changed out the thermostat ...
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Connected C-Wire (previously unused) to thermostat, but still no power?

In search of help with hooking up a Nest Thermostat E. I have seen several threads seeking solutions for similar issues and have troubleshooted with their proposed solutions with no luck. I am ...
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C-Wire for thermostat

My furnace is a gmp075-3 There is an existing unused Blue wire coming from the thermostat to the furnace area but not attached to anything. (upper blue wire in 2nd image) Can I just connect the upper ...
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Why is my furnace making grinding noises after thermostat replacement?

Replaced Lux (LTX9600) with Emerson Sensi thermostat. New Sensi thermostat will control heat but have unexpected behaviors like: when thermostat turn on and off heat there is a momentary grinding ...
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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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Heater blowing cool air

I did an experiment with the central heater when I noticed it was blowing slightly cool air. I first let the temperature drop to 67 degrees. Then, I set the thermostat to 68, which triggered the ...
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1answer
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Why does my first floor thermostat also make my third floor baseboards turn on?

(Possibly related to this question but I do not have the expertise to diagnose at the level of the author of that question) I moved into a new house recently that was billed as having three heating ...
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1answer
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Determining what zones are controlled by which thermostat

I purchased a quad plex. We live in the double unit on the first floor and have one thermostat which seems to call for heat in our zone. On the second floor there are 2 units with seperate thermostats ...
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1answer
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Pro T705 thermostat: heat kicks on when it drops below 64.5 despite it being set to kick on at 60

I have a Pro T705 thermostat. At night, I have it set to only heat when the temperature drops below 60 degrees F. I have the wake up temperature set to 73 degrees. I have a Netamo system in the same ...
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1answer
32 views

C-wire help needed with Nest thermostat install

My air handler (see photo) connections are G,W,Y,R and COM. The a/c compressor (outside) is connected to air handler Y and COM. I have 5 wires out to the thermostat, G,W,Y,Rh with jumper to Rc, and an ...
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White and Rodgers programable thermostat

Every Monday morning, 12:00 a.m. my heat goes on to 70*. It is not programmed to go on. It does this automatically. It stays at 70* until it is programmed to go down and runs properly until the next ...
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Burning smell from AC vents after installing new thermostat

I was installing a new thermostat (ecobee3 lite Smart Thermostat, 2nd gen) to my AC unit (ARUF61D14AA). I opened my current thermostat and noticed that I don't have a C-wire (which is required for the ...
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1answer
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Furnace often hums but not blowing air until resetting thermostat

Having a frequent problem with my furnace where I can hear it humming softly, yet no air is coming out of the registers and the house temperature slowly falls. It seems that this state can continue ...
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71 views

Adding C wire for wireless thermostat

I'm trying to install a new wireless thermostat but my old setup only uses 2 wires; one white and one red. On the side of my furnace there is this transformer mounted. There are four cables on the ...
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1answer
38 views

Thermostat C wiring issue

I am having a two-wire system oil boiler with two-zone valves. I installed two Nest E and worked fine but it started to swing the valves due to the charging cycle. So I decided to run a new C wire ...
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Installed Honeywell T5 Thermostat Now No Heat or AC

I installed a new Honeywell T5 Smart Thermostat. All wiring appears to be correct, but I did blow the 5amp fuse in the handler while hooking it up. Replaced fuse, but still not able to get the AC or ...
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1answer
51 views

Two Thermostats on a single zone

Can I have two thermostats connected to the same zone on my Taco Controller? I have two Taco Controllers with a total of 9 Hot Water zones. One of my Hot Water zones is for the Entrance Hall, Living ...
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How do you estimate the probability of failure in this case? [closed]

The fan relay draws 6.0A. That is a safe current for 16 gauge wire. The safety fuse is tripped at 15A which is too much 16 gauge wire. This installation guide shows the Installation Instructions for ...
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64 views

How do I search for a thermostat that has a delay before it turns on heating, rather than instantly turning on once the temperature drops by 1 degree?

I bought a cheap thermostat which has an annoying problem: if I set it to 70 degrees, it will turn on the heating as soon as the temperature drops to 69 degrees and turn it off as soon as it increases ...
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1answer
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Help running a C wire from my furnace--no voltage from the C terminal on the circuit board

I am thinking about changing thermostats for my ICP END4X36T17A2 furnace, but my options are pretty limited due to my current thermostat hookup lacking a C wire. It currently has four wires hooked up ...
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121 views

Does there exist a battery-powered, programmable, millivolt thermostat?

I'd like to replace a mechanical millivolt (2-wire) thermostat for my propane space heater stove with a programmable one. I'd like to do this to ensure that the space heater doesn't heat overnight, ...
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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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66 views

Is my thermostat keeps losing power due to a furnace fault? [closed]

I suspect my furnace of reaching a temperature limit and cutting power to my thermostat as a result. How would I determine if that is the case? First off, my situation is very similar to Furnace turns ...
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146 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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1answer
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Aprilaire 600M Wiring to Honeywell TH8321 Stat

Very rookie DIY guy here...I have installed an Aprilaire 600M but can't figure out how to wire it. My thermostat currently is using the U1 port for a normally-closed damper on a fresh air intake. I ...
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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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How do I calibrate a Totaline thermostat?

Our thermostat is not reading correctly how can I calibrate it? I searched the Totaline site and it seems like this particular product is not listed (and I can not find the model of this product), ...
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102 views

Upgrading thermostat: 2 baseboard heaters (6 wires)

I'm upgrading a thermostat, and the installation isn't quite as simple as I'd hoped. In this COVID era, I think I'd like to avoid having an electrician inside my home... Some facts: the circuit ...
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How is propane stove thermostat supposed to work? [Quadrafire Grand Bay DV40]

The home we bought came with a propane stove, with markings Quadrafire Grand Bay DV40. The stove is connected with a simple two-wire (non-powered) bimetal thermostat switch. How is the thermostat ...
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1answer
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Force Furnace Blower to Run on Separate Schedule to Circulate Air

Appreciate any and all insights you might provide. I could tamper with this until I figured it out but I'm hoping that your collective expertise will save me some time and keep me safe! I've got an ...
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Can Honeywell c wire adapter or Venstar add-a-wire work with dual transformer system?

I have a dual transformer system where the baseboard heat (RH-W) and AC (RC-Y-G) are wired independently and currently it's working well on my Honeywell thermostat. I would like to buy a smart ...
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How to wire Minivector control relay for Honeywell Wifi Thermostat to control 240v baseboard heater

new here, and just a "homeowner electrician". When I bought the house there was a low voltage thermostat controlling a 240v Cadet baseboard heater. Upon investigation, there is a Minivector ...
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What can I use as a C wire for my new thermostat?

I currently just installed the nest e thermostat which replaced an older Honeywell thermostat for my older oil furnace. I connected the Red and a white wire to the new thermostat and it worked for a ...
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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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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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Thermostat C-wire not working

I recently switched out my old thermostat for a new thermostat. The previous thermostat had an R, Y, W, G, and C wire. I plugged all of these wires into the same ports on my new thermostat. After ...

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