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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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2answers
821 views

Where do I connect a C wire in an old Furnace?

I am hoping to be able to upgrade to a smart thermostat but unfortunately my furnace doesn't have the "easy" option with an obvious C terminal. My furnace is OLD but it actually has the full 5 ...
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1answer
94 views

Connect Wifi Thermostat to Goodman GMP050-3?

I'm trying to connect up a wifi thermostat to Goodman furnace, specifically the GMP050-3. I've done some reading on this but I'm still not quite sure how to go about it. Specifically, I'm not sure ...
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29 views

Connecting separate boiler and A/C controls to one thermostat

Presently both the boiler control and A/C air handler have a 24V transformers, and are controlled by separate thermostats. I'd like to use one thermostat for both? To avoid possible phase conflicts ...
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2answers
52 views

Gas Furnace only, is Y wire needed?

I have force air (propane furnace). I would like to upgrade to a new "smart" thermostat, but they didn't run a C (common) wire which is required for most of these units to run properly. I do however,...
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1answer
318 views

Help wiring replacement Honeywell to Nest 3rd gen

Need help with identifying wires on Honeywell TH9320WF5003, using Nest compatibility checker to replace with Nest gen 3 One of wires look like "W- O/B, not sure which wire it really is nest doesn't ...
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1answer
76 views

How to identify the C terminal on my HVAC [duplicate]

As you can see I have a Y G W R/2 C/3 D/1 terminals on my HVAC. I am planning to change my thermostat to one that requires a c line. There are 2 spare lines available, however I am not sure which is ...
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0answers
56 views

Changing AC Fan Motor/Capacitor with No Luck

Issues with a central AC unit: Turned it on and heard a buzzing sound, but the fan didn't start. Started by looking at the dual capacitor. We happen to have two identical units, so I tried the ...
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1answer
426 views

Does the Nest thermostat automatically change modes?

I understand from the Nest website that the thermostat has heating, cooling, and heat/cool modes. I also know that over time Nest learns your preferences based on how you adjust the thermostat, and ...
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136 views

Nest for this setup

Is this the correct wiring setup for nest.
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2answers
707 views

Is the transformer bad on my Central Air Conditioner?

Need some help diagnosing a problem. My very old central AC unit isn't working. It's just AC and about a year ago I connected a C-Wire to the air handler when swapping the thermostat for a wifi ...
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0answers
64 views

Wiring for a new honeywell thermostat

I am trying to install a basic Honeywell Programmable thermostat, but the wiring is a bit different, and I am reluctant to start taking it apart. I have a Goodman heat pump, which is occasionally ...
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1answer
437 views

Where to connect c wire in furnace?

I'm trying to figure out where to connect a C wire from a thermostat to my furnace. I found this old post for the same furnace type (Trane XE70), but it seems as though a red wire goes to the terminal ...
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60 views

Thermostat Replacement - what to do with C Wire

I'm replacing an old Honeywell T8195B with a less old Honeywell T8112D1005. The T8195B has the same wires as the T8112D1005 - except the T8195B also has a C Wire. The C Wire location on the ...
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1answer
67 views

Condenser is always running

I recently rewired two thermostats into one Honeywell RTH9580WF1005 Wifi Thermostat. I ran a new wire and hooked up R and W to the oil boiler and Rc, C, G, and Y to the Goodman air handler. The Y is ...
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0answers
65 views

Correct wiring for Nest thermostat with dual HVAC system

Trying to wire up this new-fangled Nest Thermostat E (the cheapy edition) to my home HVAC system, but unsure of what to do. At the thermostat, I have G, W, Y, R, AND Rc wires, but the R and Rc wires ...
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42 views

Identify furance/cooling system from wiring?

Is there any way to tell the heating/cool system you have from the wiring? I have a Honeywell th6320wf02 that was correctly working and then I accidentally overwrote its system type. It's wired like ...
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1answer
578 views

Thermostat jumper wire missing

I am missing my jumper wire on my thermostat. What do I replace it with? I have been researching how to fix it.
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1answer
811 views

How to Wire 3 baseboard Heaters with 2 Thermostats

I have one 20 amp double pole circuit that I am planning to run 3 baseboard heaters on with 2 line voltage thermostats. I have already made sure the watt consumption for the 3 heaters will not exceed ...
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1answer
100 views

Ecobee restarts when calling AC - old analog thermostat worked

I just installed an ecobee 4 and I have a C-wire so it seemed straightforward. The ecobee shows that it detected all the expected wires. However when it tries to call the AC it instantly restarts ...
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1answer
4k views

Can I install a nest thermostat on a 2-wire boiler (with unmarked wires)?

Our house has an old boiler, and the thermostat isn't working. I'd like to replace it with a Nest thermostat. But, when I took the cover off to check which wires it had, I only see two wires (red and ...
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1answer
4k views

MyInfinity thermostat dropping connection with Carrier server

My MyInfinity thermostat keeps randomly dropping connection carrier server. Wifi connectivity is stable (Arris TG1682g modem). Thermostat panel shows not connected to www.api.ing.carrier.com ...
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33 views

Two Separate Systems on one Thermostat?

I have a baseboard hot water system and a separate gas furnace with heat and AC. Thus far, they have been on two separate thermostats. Is there a way to put them on one thermostat or is there a ...
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2answers
310 views

Turning on AC either resets thermostat or blows fuse

I have an 10-year-old American Standard Freedom 90 HVAC system, with an outdoor AC compressor. My thermostat (Honeywell RTC6580WF 1001) stopped being able to turn the AC on (it could still turn the ...
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1answer
115 views

Talking Thermostat also saying “two sixty four” [duplicate]

This has been asked before but there wasn't any solution. To top it off, I'm new and I can't ask the OP if he solved his problem. I may have to call him tonight. He's in the next town over. But let's ...
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2answers
5k views

Nest Thermostat - Not cooling

First warm weather using my nest thermostat and now trying to use the central air. However, only the fan turns on and it doesn't actually cool no matter how long I run it. (It worked perfectly in the ...
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1answer
29 views

Is my control board bad?

I have a Goodman evaporator/gas heating unit that runs the central fan motor constantly after it is powered up a couple of seconds. This happens regardless of what wires are hooked to the control ...
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1answer
311 views

Running furnace fan as cooling

I have a regular furnace without a HVAC setup. When it's summer we usually have the fan running constantly. The furnace fan then runs at about half the speed as it would when the heat is one. ...
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3answers
565 views

The blower on my HVAC runs sometimes when it should be off

The blower on my HVAC runs sometimes when it should be off. It does not run all of the time. The furnace is in the attic and the abnormal running seems to be related to the attic temperature. ...
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2answers
84 views

Control thermostat capillary failure reason why?

The problem I have is the temperature goes way too high on the electric oven - this is a new oven that failed on the first day that I am now stuck with. I diagnosed it to the control thermostat. As ...
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0answers
18 views

Replacement & wiring of different types of thermostats

Is the wiring for dual thermostats (ac/ heat) and/or single heat only (baseboard) thermostats the same for all brands?
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1answer
222 views

What do the numbers 1 to 9 mean on my thermostat? [closed]

What do the numbers translate to in temperatures?
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1answer
144 views

Lennox G23Q3/4-100-2 And Ecobee4

**Pictures attached to go along with my rambling explanation I have my Lennox G23Q3/4-100-2 natural gas furnace and my central air system that has been working since 1995 on a basic programmable ...
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1answer
232 views

What are these extra wires behind my thermostat?

I an hoping to install a new thermostat that requires a C wire. I pulled off my old thermostat, an old round dial type, and it was of course only connected to four wires. The four wires are the only ...
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1answer
24 views

thermostat assembly verification for electric oven (with pictures)

I am diagnosing issue with my electric oven which does not engage heat element. Basically it's thermostat (BA, BR, C) -> relays -> heat elements (2 top, 1 bottom). hardwired. I disassemble the ...
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141 views

Connect C wire to Carrier board

I got Carrier board HK61EA010 and extra C-blue wire that is not connected to the board. I wanna use this wire to power WI-FI thermostat. I cannot find the manual for this board. Does anyone know where ...
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1answer
391 views

Is my Nest thermostat wired correctly?

I've been having issues like the heat pump not heating. Now that it's hot outside, my A/C isn't working. Can someone tell me if my Nest thermostat is even wired correctly? If it helps any, here is ...
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2answers
670 views

Installing thermostat - No C wire or C terminal available on furnace

So I've looked through many posts all over reddit and other websites but it seems every furnace is slightly different. I am an early twenties guy who doesn't want to burn down his apartment. If ...
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0answers
25 views

Portable heat pump strange thermostat

I've got an Olimpia Splendid Ellisse HP portable heat pump with strange/incorrect thermostat readings. According to another thermometer the room temperature is currently 16.9C, the heat pump ...
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0answers
238 views

Honeywell WiFi programmable thermostat with propane heater and swamp cooler wiring help

I have a swamp cooler with a 2 speed motor, however I don't care to use both speeds, just high so hoping that may make the wiring easier. Heat is an old propane heater with 4 wires, no c wire. I have ...
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1answer
1k views

Where to connect my “c” wire on the boiler side. Weil mclain gas boiler

Im just curious if the “c” terminal on the plug in relay is where im suppose to connect my “c” wire on the boiler side. I have 18/5 wire ran already. Just need to find out where to terminate. To the ...
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2answers
2k views

Converting from a Trane XT500C AC Thermostat to Honeywell TB8220U1003 VisionPro 8000

All, I am trying to upgrade my Thermostat and am very confused how to connect the wires correctly (Florida house built 1991, AC and heat strips, no furnace): As is, Trane XT500 Blue to B Red to R ...
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1answer
766 views

Wiring a new thermostat without a C wire, extra wires from furnace

I have checked other posts regarding this and don't see a solution yet. I have purchased a new thermostat that requires a c wire. My old thermostat's c wire didn't work so I went ahead and added a ...
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2answers
1k views

Nest thermostat gen 2 won’t turn off furnace

I’m struggling to find a solution for my furnace. It’s an older Lennox furnace and runs fine. The problem I’m having is that it keeps burning up my thermostats and once it does it won’t let the ...
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2answers
228 views

Nest E Thermostat Power

My thermostat is in the basement, connected to a Honeywell R845A to run a circulating pump for heat. I bought an Nest E for the main house and it works great. I want to replace the thermostat in the ...
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1answer
487 views

Ecobee 4 installation - No C constant 24V option on Furnace

Ecobee 4 installation help? Any handy people available? I am looking to install an Ecobee 4 in my condo. There is an older HVAC system, Unilux LE600. The furnace itself does not have a C connector, ...
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1answer
55 views

Furnace and Thermostat Issue

One day my parent's furnace and thermostat stopped working. The thermostat is a smart thermostat that depends on 24volts to the R and C wire. We measured voltage between the R and C wire and was ...
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0answers
65 views

Is this line voltage thermostat sufficient?

I'm replacing a bad Aube line voltage thermostat for my electric baseboard heaters. I liked the model, so I purchased what I thought was the same one - however I missed a letter in the model. What I ...
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0answers
260 views

Wiring 24VAC transformer to power WiFi Thermostat on Generator

I would like to power my WiFi thermostat on house power, and from a 24VAC transformer hooked to a nearby outlet that is powered by a generator when there is a power outage. I have 3-wire cooling (Rc, ...
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0answers
11 views

honeywell T6360B Room Thermostat

I have an old honey well thermostat on wall and am replacing with T6360B Room Thermostat . The old one has red , blue and yellow cable. Can anyone advise what ports they go into on the T6360B Room ...
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1answer
2k views

How to wire C wire to the transformer of HVAC?

How are you all doing? I tried to connect the digital thermostat (Ecobee3) instead of my old honeywell thermostat. The original wiring is below (figure 1) HVAC is located on the ceiling of bathroom ...