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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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1answer
40 views

re-wiring/retro-wiring a Carrier 40MVC024 ductless A/C for external thermostat: guidance

My server room has two air-conditioning units, with acutely counterproductive controls. I want to rewire them for external thermostats. Can I simply splice a traditional thermostat inline with the "...
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0answers
17 views

Do I need to replace the thermostat wiring leading to my boiler?

I have a boiler in an old building with four different apartments. There are two thermostats that call for heat from the boiler, and valves that direct the hot water to the respective part of the ...
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1answer
1k views

Why my baseboard heater won’t turn with new thermostat?

I have a pair of electromod basement heater. The label on each of them show them show 750/1000W. Power supply to this is 240V I am trying to replace the old manual thermostat with a progrmabale one. ...
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1answer
58 views

Upgrading from a two wire analog tstat to a Nest, need help

I am looking to upgrade from an old analog tstat to a Nest. My old stat had only two wires connected (R and W) but the wire bundle had three. So I tried connecting the green wire to C and then turned ...
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1answer
106 views

how to get 240V to 4 wire 240V thermostat

I have a 2 pole circuit breaker in the panel with a 2/12 cable connected to it. Black wire is connected to one pole, white wire is connected to other pole and bare wire is connected to ground bar. ...
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3answers
709 views

Wiring for ecobee3 lite

I recently purchased the ecobee3 lite and am now stuck trying to install them. I have 3 Honeywell thermostats I am looking to replace and my heating system is oil/hot water. My home was built in 1970 ...
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2answers
335 views

Checking voltmeter on my Honeywell Wifi Programmable Thermostat

I have a wifi programmable Honeywell thermostat. Worked fine for 3 years, this morning I turned on my gas furnace for the first time this year and it would not go off, even when I set the "Heat" / "...
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1answer
72 views

replacing old line voltage thermostat

My old 4 wire 240V mechanical line voltage thermostat stopped working. I want to replace it with a digital thermostat. Problem is I don't know the amp rating of the old thermostat. I checked with ...
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1answer
290 views

Wiring Baystat240a to Honeywell RTH2510 w/ picture

I tried to hook up the wires but all the lettered terminals on my old thermostat don't match the letters on the Honeywell thermostat. I have the AC working but I still have three wires left over. I'm ...
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1answer
493 views

Connecting Wood/Electric Furnace to Smart Thermostat

UPDATE: I spoke with an ecobee tech and they pointed me to an alternative solution. If I get an adapter called a "Fast-Stat Common Maker", all I need to do is figure out where to connect the C-Wire ...
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2answers
3k views

How do you remove a Carrier / Bryant Infinity thermostat control from the wall?

I have a Carrier Infinity system with model # SYSTXCCUID01-V thermostat/control. I need to temporarily remove it from the wall. I found a diagram of how to install it: (diagram source) I do not ...
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1answer
92 views

Ecobee 3 lite Installation — Confusion about C wire (on furnace but not at thuermostat)

I am about to install the ecobee 3 lite thermostat. On the thermostat end, there is no C wire - just the typical 4 wires - R,Y,W,... On the furnace end though, there is white C wire too, which I do ...
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2answers
359 views

How to hook up new 5 wire HVAC cable to newer HVAC unit with only 2 wires coming from it?? WITH PHOTOS

I have a newer HVAC unit that was installed using only 2 wires to control the heating only on the unit. The unit is capable of having AC connected and I would like to wire it so that it will work with ...
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1answer
335 views

My AC and Heat systems are separate, Can I wire one or both fan(only) controls to my thermostat?

My house used to have just Forced Air heat, but a year and a half ago, I had central air installed. When it was installed I had questions about the wiring they weren't addressed to my satisfaction. ...
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1answer
983 views

Turning off Power to Thermostat to Replace It

I'm replacing my old thermostat due to issues with it somehow not staying at my set temperature. It's a Simple Comfort 2001, and I'm replacing it with a newer model, a Simple Clean 2001L. Both of them ...
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1answer
44 views

Temperature monitoring for storage hot water system (RP-2 connection)

My HWS has a secondary outlet connection I don't use, and I'd like to use it to install a thermal probe I can monitor. HWS RP ¾ / 20 temp probe? Does anyone know of a practical way to install a ...
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2answers
101 views

Need to identify a common wire on my old HVAC

For Nest Thermostat 3, I am trying to identify a common wire on my old HVAC. The diagram can be found on the link below:
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2answers
4k 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
215 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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2answers
71 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
396 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
154 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
164 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
787 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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0answers
292 views

Nest for this setup

Is this the correct wiring setup for nest.
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2answers
3k 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
203 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
1k 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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1answer
134 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
96 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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0answers
81 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
1k 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
2k 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
309 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
6k 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
10k 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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0answers
56 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
726 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
169 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
10k 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
45 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
566 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
864 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
252 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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1answer
441 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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2answers
223 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
355 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
26 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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0answers
191 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
559 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 ...