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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Theory: How do thermostats without a “C” common wire get powered?

My simple question is: When a thermostat has four wires: white, red, green, and yellow, the red is for 24V (AC?) and the white/green/yellow are for heat/fan/cooling. The role of the thermostat is to ...
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1answer
30 views

Can I use a nest thermostat for two heating sources (Furnace and electric floor heating)

Current situation: My home is currently heated with central air. Not my first choice, but that's what I have. I have brand new 98% efficient modulating furnace controlled by a Nest thermostat(no AC)...
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24 views

Electric water heater thermostat keeps tripping and needing reset

I have a 40-gal A.O. Smith Promax electric water heater (see pics below). It was a few years old when we bought the house, and we've been living here about 10 years. So I realize the heater may be ...
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510 views

Identify voltage by looking into gang box

I was replacing few of my old manual thermostats with smart thermostats. While installing the new ones, I noticed that some of the gang boxes have 4 wires (2 black, 2 red). Some of them have 6 wires (...
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Nest thermostat wiring problems

Removing my old Honeywell thermostat to replace with the nest. I live in Florida and my ac unit is 10 years old. I’m not sure if I have conventional heat or a pump. I took a picture of the old one but ...
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1answer
24 views

Use a 2-wire line voltage thermostat on a 24v / low voltage 2-wire furnace

This is an ancient furnace at my aging mother's. Basic 24v thermostat, two wires only, the original from my childhood used a mercury switch. There are some commercial, line voltage, 2-wire thermostats ...
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1answer
28 views

Help with a Nest E install on a old HVAC system

Hello I am trying to replace this thermostat with a Nest E but this has proven more complicated than I thought: I plugged all the cables to the nest adapter and figured that the blue wire which wasn'...
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26 views

Connecting two thermostats in parallel to control old millivolt wall gas heater

Hello I have a very old propane wall heater on a vacation home. It is a "millivolt" type that does not require external power (no battery, no 24 VAC, no 110 VAC). It is a simple 2 wire system. No C ...
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1answer
82 views

I have a garage heater but I don't want it to run at all if the temperature outside is above 45 degrees

I was thinking about putting two thermostats in series so that I could set the garage temp to ~65° but ONLY have it come on in the event that the outdoor temp falls below ~45°. The garage does get a ...
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1answer
47 views

Thermostat/Furnace Wiring Confirmation

Like so many others, I am looking to install a new wifi thermostat with an older furnace. I've searched across the Internet and I have a pretty good idea of what is needed and why; however, I have a ...
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44 views

Where to connect a C wire for my smart thermostat

I am trying to connect the c wire but I'm at a crossroads of sorts. I have a dual zone so there are 2 thermostat wires come into what looks like a relay box ( see pictures) I have located the ...
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Aprilaire 600, No water to filter

I don't get 25v to thermostat. If I short out the outside air on the control panel I get the thermostat to kick in and I get water to the filter. I can't locate the outdoor sensor if ti is bad
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1answer
38 views

Red wire in place of C-WIRE?

I just moved into a new home and was trying to connect my Ecobee thermostat. I know it requires a C-wire. I found the wire wrapped around the others in the previous thermostat, which didn't require ...
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1answer
68 views

Thermostat wiring

Can someone look at wiring of my thermostat and HVAC panel? I don't understand why R wire is connected to RC at thermostat. I am also not sure why Y wire is not connected at HVAC panel. Here is my ...
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37 views

Checking voltage on a 240 volt thermostat

Very basic electrical question. I have a non-functioning double pole thermostat (wired to an electric baseboard). I'd like to replace it, but of course my breakers are not labeled. Is there any way to ...
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Honeywell RTH5160D Thermostat Wiring w/ Heat Pump

I have installed a Goodman heat pump and a Honeywell RTH5160D thermostat. I chose that thermostat because it is supposed to switch automatically between cooling and heat modes. The system has been ...
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1answer
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Trane air handler twe036c140a0 create “c” wire

Trane Air Handler twe036c140a0 Create "C" Wire Can someone please tell me the best way to Create a "C" Wire for a Honeywell WiFi thermostat (model rth9585wf).
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One Thermostat for 2 Air Handlers

We have 2 single stage AC/NG gas furnaces serving a common area. We would like to set them up for 2 stage operation on a common programable smart thermostat. Should I combine the R and C wire from ...
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Replacing thermostat and metal plate inside wall cutout

I am replacing my Honeywell thermostat. I removed the old one and there is a metal plate inside the drywall cutout that the old one was screwed to. I need to remove the plate because the screw holes ...
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Nest Thermostat E Wiring Question

all, I wanted to get a Nets Thermostat E, but my current thermostat doesn't have a C wire. From what I read online, it's better to use a C wire, so I was considering adding a Venstar Acc0410 adapter....
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29 views

Tried switching old thermostat with digital one…wasn't working, so switched it back to old one and ir is still not working

I decided to upgrade the old thermostat control for heating/cooling, to a simple non-programmable digital unit. I simply attached the wires to the corresponding terminals in the new unit. After ...
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1answer
17 views

Adding c wire to Goodman model GMT070-3B gas

this is a photo of the old board I took out a while back. New one is the same. I'm trying to add a c wire and don't know where to put it on the board. Can anyone help me?
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Thermostat Unit Pops Out When Trying to Close

My father has a radiator in his house that is missing a Thermostat Unit (the plastic thing that screws on top of the valve - not really sure what it's called). I managed to screw on a unit from ...
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1answer
39 views

Using a second thermostat as a remote temp sensor

I’m using Honeywell WiFi enabled thermostats to control heating and cooling at home and cottage. I would like to add another thermostat of the same type simply so that I can remotely read the ...
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1answer
31 views

Connecting thermostat common wire to air handler or boiler?

we are planning to install a Nest learning thermostat in our house. On first installation attempt the device notified us that there was no power from the Rh or Rc wires which from my understanding is ...
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PTAC heat troubleshooting

I own a condo with two Islandaire EZ09EBMXH8N10AA PTACs, one of which is acting weird. They have self-contained A/C mechanisms, but the rooms are heated by pumping hot water from the building through ...
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1answer
32 views

How to add a C wire to an old Lennox attic furnace GS810-105N

I bought a smart thermostat for my house in hopes of cutting some bills a little. I read up on them, I thought, thoroughly and figured I could handle the task. However, upon climbing up in the attic ...
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2answers
28 views

Can I hook up the Glas WiFi Thermostat with oil furnace in basement and central ac in attic

I have an oil furnace in my basement with only 3 wires for the thermostat only 2 being used. I just installed central air in my house but air handler is in the attic with 5 wires for the thermostat 4 ...
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Pretty basic Honeywell Wireless Thermostat Questions

I thought I knew at least the basics of how the Honeywell Thermostat worked, but testing with a multi-meter dashed those presumptions. I have another question posted, but until I get the basics ...
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1answer
36 views

Honeywell TH6320R1004 Wireless Thermostat with Two Transformers

I have a Honeywell TH6320R1004 and am trying to set it up to work with a second transformer (just added a Taco ZVC403 to an existing Taco SR503). The second transformer was needed to power the zone ...
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How to wire my new thermostat from old boiler switch

I bought a new thermostat hoping to replace a simple on/off switch for my boiler. I've never done this before and am confused about how I should arrange the wiring on the thermostat board. This is ...
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How do I turn off the programs on my White Rodgers thermostat?

I can't find anything on the internet about this issue. Sites like this: https://www.hunker.com/12279552/how-to-program-a-white-rogers-thermostat explain how to set up a program but they don't explain ...
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1answer
40 views

Where do I connect C-wire to Burnham boiler?

I'm adding a smart thermostat to one zone of a two wire, oil fired boiler system. I've roughed in a new wire and could use some help determining where to terminate it at the boiler. The wiring is far ...
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28 views

New thermostat turns fan off when set to on, never turns off on auto

My oil heat furnace was functioning normally on an old mercury switch thermostat, but I wanted to replace it with a programmable Honeywell 5+2 one. There were Y, W, G, R, and B wires screwed in on the ...
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2answers
77 views

How do you install a thermostat if you don't have Y or C wires?

My thermostat is a LuxPro LUX PSP511LCa. I looked behind the thermostat and I see the following: A red wire connected to RC A jumper connecting RH and RC A white wire connected to W A green wire ...
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I live in a multi unit home and we have two heat meters but only one thermostat. What is needed to get a 2nd thermostat?

The basement and top two floors are on one bill and the first floor is on another bill. What is needed to get the first floor its own thermostat?
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1answer
57 views

How to connect 2 thermostats and baseboard heaters on one breaker?

I have already run the wire from the electrical box ( not connected) to the thermostats and heaters (not connected) now I need to know which wire is to be connected in order. It’s 12/2 gauge red and ...
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1answer
52 views

Adding a C wire and fixing White vs Red on my Furnace

TLDR: I think I need to flip R and W wires, and to splice the blue (C) wire to the brown wire coming of the transformer. Is this correct? Long version: Like many others on here, I'm trying to add a ...
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1answer
43 views

Honeywell T6 PRO Z-Wave Thermostat (model th6320zw2003) exhibits very erratic behavior after battery replacement

Background: My apartment complex installed Honeywell model th6320zw2003 thermostats in all units about six months or so ago, and it had been working well for all that time. The only issue was that ...
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I am installing a Honeywell Pro 2000

So, I have the green, white, blue and red wires coming in, but DO NOT have a yellow. There is a brown. I do have both regular gas heat, and AC. What terminal should the brown wire go? And should the ...
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1answer
42 views

April Aire 600 powers off while furnace is firing

After having a new furnace and AC installed in the summer of 2018, replacing my 20-year old equipment, the existing AprilAire 600 whole-house humidifier behaves differently than before. During the ...
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1answer
43 views

Secondary C Terminal on Furnace Circuit Board?

I was trying to install an Ecobee thermostat, and there was no C wire installed. When I went to install the power extender kit, I saw the standard C wire terminal was broken out of the black plastic ...
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Enable “early start learning mode” on my hot water heater system thermostat?

Last year our old thermostat died and we got a new one. This is not a smart wi-fi connected thermostat, but it has an "early start learning mode" setting which isn't enabled by default. Last winter I ...
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2answers
74 views

Installing double-pole line voltage thermostat for 2 baseboard heaters

I'm trying to replace an old manual thermostat with a new digital thermostat for my line voltage baseboard heaters. If it's important, this particular thermostat simultaneously controls two separate ...
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1answer
32 views

Honeywell aquastat L8124L install

I am planning to replace the erratic aquastat in an oil-fired furnace. I was able to get the exact replacement model-L8124L. Does it require shutting off water to the tank and priming after the ...
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1answer
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In the majority of UK-based traditional boiler setups, what does the hot water thermostat look like?

I realise that this may be an impossible question, but I was wondering if somebody would be able to help. For the majority of traditional boiler setups in the UK where hot water is stored in a tank, ...
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1answer
62 views

Old electric baseboard heater thermostat wiring

I have a question about an old federal pacific baseboard heater thermostat's wiring. I disconnected this thermostat 2 weeks ago, thinking that we were going to remove the heater. Now we've decided to ...
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1answer
23 views

multiple thermostat boiler connection

I have a boiler system with thermostats and valves for three floors. before i changed the boiler what ever thermostat called for heat worked for that floor. Now all thermostats have to be on or ...
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57 views

Replacing old thermostat and two unidentified wires

I'm replacing an old thermostat from the early 90's with a new wifi thermostat. When removing the old one, it only used R,G,Y,W wires, and the new wifi thermostat requires a C. After fully removing ...
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83 views

Only getting 15-16 volts from Furnace R and C

I recently purchased a smart thermostat. Because it needed a common wire and I only had a 3 wire setup, I ran a new thermostat wire to my furnace. However, I now get only 15 volts (inconsistently, ...