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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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47 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
710 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
1k 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
119 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
5k 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
34 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
375 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
118 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
30 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
333 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
622 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
118 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
274 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
155 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
249 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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163 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
419 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
717 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
29 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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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
3k 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
823 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
2k 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
257 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
530 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
60 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
66 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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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 ...
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0answers
207 views

Nest + opentherm + zone valve

I have a Nest 3G, I'm now considering to change my boiler due to age-related issues. Can someone tell me if I can connect the Heat-Link to both zone-valve (on/off contacts) and boiler (OpenTherm). I ...
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6answers
505 views

Why can I not find a 120V programmable 2-pole thermostat

I'm wanting to connect a 120V wall heater to a programmable, 2-pole thermostat. The difference between 1 vs. 2 poles involves whether or not the thermostat can truly, completely cut power or not. ...
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241 views

Master thermostats on a multi zone heat system

I have a 5 zone split level house with forced hot water heat. The issue I’m running into is that my house has an in-law apartment that I rent out and it occupies 2 of the 5 zones, and the other 3 are ...
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2answers
973 views

Can 1 24v transformer support 2 smart thermostats.

I replaced my old thermostat with a lyric. My doorbell transformed was unused and 16 V. I replaced that with a 24 and wired it directly to my lyric. Everything works great. If I do an additional ...
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1answer
874 views

Honeywell Mercury Themostat 3 Wire, replace with Digital/Programmable?

Have an old Honeywell thermostat (house is 17 years old). Wondering if I can replace it with a newer Digital or Programmable one? Here are some pictures of it.
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0answers
54 views

Smart Thermostat (Nest, Honeywell or Ecobee) from KMC wiring?

I moved into a 1br condo recently and was looking to update the thermostat to Nest (or other Smart home thermostat). The current thermostat model is KMC and when I took off the casing, the wiring does ...
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1answer
201 views

Installing Honeywell RTH9580WF on ICM280 Furnace Control Board

I bought for my new apartment thermostat Honeywell RTH9580WF to replace my old Honeywell TH3110D1008. I watched almost every video I could find on internet "How to do it", but I couldn't fined ...
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2answers
114 views

Is there a low temperature thermostat that is simulatneous switching for two electric garage heaters? [closed]

I want to connect two QMark MUH108 10kw electric garage heaters to a single thermostat. According to the spec sheet, this unit uses 24 V control. It was previously asked about a low temp thermostat ...
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2answers
2k views

Electric baseboard heaters stuck on with digital thermostat

I have two electric baseboard heaters in my house that are both controlled by a single digital programmable thermostat (King ESP-230). I believe each heater is 1500w so 3000w total. Twice now in the ...
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1answer
30 views

Why does my oil furnace cycle quickly?

I have a Rheem ROBF-067LBEA949 oil furnace as part of a forced-air Rheem UPNL-036JAZ heat-pump heating-and-cooling system, controlled by a Honeywell TH5220D1029 thermostat in its 2H1C w/ AUX ...
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2answers
47 views

Upgrading from a 3 wire rotary thermostat to a Electronic Digital

This is my first post so please be gentle. I currently have a Honeywell rotary thermostat (240V) 3 Wires plus earth. Live in Neutral (for the anticipator I believe) Switched live out I appreciate ...
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2answers
994 views

Thermostat set at 65 - Furnace went to 90 - possible causes?

Oil furnace. Honeywell programmable thermostat (not WiFi-battery operated). Heat set as always at 65 degrees F with auto fan. No changes to settings whatsoever. Had been working fine all winter. ...
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2answers
107 views

Why do my rooms heat to different temperatures?

Any advise would be appreciated. We moved into a 30-year-old home and this is our first winter and we've noticed that some of the rooms are colder than the others but none of the rooms are actually ...
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1answer
25 views

Is this thermolimiter faulty?

After recently replacing a broken fan element, my oven still doesn't heat up. I'm trying to establish whether the other elements are at fault or whether the faulty part is the thermolimiter. The oven ...
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1answer
183 views

Replacing old thermostat with 2 white wires for zone boiler heat

I am replacing our basement thermostat that had a white and orange wire together and a white and blue wire together. That is all there is. I ham trying to put in a heat only non programmable honeywell ...
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2answers
32 views

Home thermostat woes

I tried to switch to a new smart thermostat in my home. When I was adding it, something happened. The new thermostat didn't show any power (And yes, the C wire was plugged in). Not knowing what else ...
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2answers
62 views

How can I install a Honeywell Wifi RTH6580WF1001 thermostat in place of a Honeywell RTH2300b?

I have separate heating (hot water) and air handler (cooling System). The current thermostat I'm using is a Honeywell RTH2300B and the new one I want to install is a Honeywell Wifi RTH6580WF1001. The ...
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2answers
2k views

Installing Nest 3rd generation thermostat from Old Trane Weathertron Thermostat (Mercury one)

Nest is not detecting Power (Rh) Showing error that power is not connected. Please help. Installing Nest 3rd generation thermostat from Old Trane Weathertron Thermostat (Mercury one) New stat wiring:...
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43 views

Thermostat & transformer

I want to ensure I'm safe. Is it normal to find fluctuating 12 volts when the thermostat (2-wire heat-only) is at "rest" and not calling for heat? The thermostat appears to function normally with a ...