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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Goodman AH2429-1A

I am trying to convert my old thermostat to a Wyze smart one and everything was going smoothly until I tried to connect the c wire adapter. I can’t find the terminals labeled YRGW like it wants me to. ...
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Does the NEC recommend metal or plastic boxes for 240V? [closed]

I need to install a junction box for 240V going to two separate Thermostats for baseboard heaters (one 750W and another 1100W). Should I use plastic or metal boxes for the thermostats and junction box?...
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Existing thermostat wire colors - no white?

Looking to switch from an old Honeywell CT87A thermostat to a smart thermostat, probably something requiring a common wire. There are 2 thermostats (one on each floor) in a 2 zone forced hot water oil ...
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What smart thermostat can be used for this gas heater?

I am located in eastern Europe and smart thermostats aren't a thing here. So there are no people with experience in installing these. I really would love to use something like google nest or ecobee ...
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Ecobee 3 Lite / Fan Center for Fan Coil / Aquastat

I live in an ancient (1967) condo with a two-pipe system. Cold supply in the summer, hot supply in the winter. There is no electronic changeover or even an automatic cutoff valve. The radiator coil ...
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Can I split a single 2500 watt baseboard heater into 2 smaller heaters?

I am converting a large bedroom into 2 smaller rooms by adding a dividing wall and hallway (see diagram). The large room had a 2500 Watt electric baseboard heater (240V). I would like to use that same ...
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Why does my furnace blower turn on when the thermostat is turned off?

The weather has been nice so we have had our thermostat turned off for about a month. The other night it turned on randomly and started blowing warmer to hot air getting the temperature to 78 degrees ...
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Lennox Wiring for Ecobee SmartThermostat

Confused by the wiring, hope someone can help me out. At the furnace there's only four wires in the cable (R, B, G, and W), but at the other end, a yellow wire appears. It's not reflected in the ...
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Is it possible that Thermostat Y wire and C wire is the same wire on my air handler (furnace)?

I'm trying to install Ecobee, and like many others, I do not have C wire at the thermostat, thus need to find it on my air handler. My air handler is from Allstyle and the model number is HFD36-42840G-...
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Nest C-wire issues with old boiler, xfmr, and 8124 aquastat

I have my C & Rc connected to my old 28vac xfmr and my W & Rh directly to T & T on aquastat. I added the Rc so the Nest would stay active in Summer when boiler is turned off. This setup ...
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How to wire Honeywell MT1 THR830TEU

Where do the 4 wires go? The diagram isn't very helpful. Live into 1 Neutral into 2 Earth into earth What number does the 4th wire go into 3 or 4?
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Two transformers connected to boiler, no A/C

My HBSmith boiler honeywell circuit box has a 2-wire from transformer to the thermostat. Then there is another transformer on the ceiling that has conduit to the same circuit box, but different ...
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Ecobee 4 thermostat with Slant fin Monitron Boiler - No C wire

I want to replace my thermostat (Honeywell th1100dv1000) for an Ecobee 4 but it needs a C-Wire. I own a Slant Fin Monitron Electric boiler currently running with only two wires (R and W). I have a ...
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2 answers
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Thermostat wiring does not provide +24V AC

A tenant indicated a heat pump failure and that the thermostat display seemed to have been turned off / disconnected. Thermostat was removed, exposing the thermostat wires. The Red and Blue did not ...
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How can I affix a loose thermostat to the wall?

I have a digital thermostat that is Luxpro. It appears to be not as strongly attached to the wall recently and for that reason I have to push it against the wall to turn on at times. The thermostat ...
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Blue wire in Y: Thermostat wired right?

I recently purchased a new property, and I noticed the thermostat's blue wire is in the Y terminal. Reading online, the blue wire is typically in C. Is my thermostat wired correctly? For reference, my ...
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Replacing thermostat in old apartment (2 green wires)

My parents live in an old apartment building from the 60s or so. Their unit has 2 gas heaters installed and two thermostats each in separate rooms. I was looking into replacing their manual ...
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Why does my fridge turn itself off?

My KitchenAid fridge intermittently turns off, and the only way to turn it back on is to turn off thermostat to off and then back to on (setting 1/2/3/4/5). Any idea what is the issue?
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My existing thermostat wiring is a 3 wire cable with three colors: red, white, and green. Green is unused. Can I use it for the common wire?

I want to install a smart thermostat and it's recommended that I have a common wire in place to supply power to it for full functionality. I checked the wire coming into the existing thermostat and it ...
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Wiring New Honeywell RTH6580WF Thermostat with no Yellow Wire at Thermostat

I am Wiring a New Honeywell RTH6580WF Thermostat but there is no Yellow Wire at Thermostat. The old Trane thermostat only had 4 connections and the blue (C wire) was connected to the Y terminal. The ...
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Thermostat wiring question (Boiler and Air Handler)

Because I have both a boiler (in the basement) and A/C air handler (attic), I have two bundles of wires at my thermostat. One bundle has wires that connect to RH and G, and the other has W and Y. ...
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Did I wire this furnace correctly?

I'm planning on connecting a nest thermostat in the next few days once my wifi is hooked up. In the meantime, I found an unused blue wire at the furnace and hooked it up to the C. My current ...
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Can I use this unused blue wire as my C wire for my new Nest thermostat?

I am a bit confused with my furnace wires. I did some research and watched a bunch of YouTube videos on how to install the Nest thermostat. I currently have a normal digital Honeywell thermostat. I ...
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Nest thermostat E keeps running

I have a nest thermostat E for a year or so, but recently it feels like it keeps running for a a prolonged time when the vent is not venting hot air anymore, worth to mention is that, it DOES bring ...
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Adding common wire to for smart thermostat

When I look at my thermostat there are 4 of 5 wires/ terminals used— red, yellow, green, white. There is a fifth wire (blue) unused. When I look at the furnace side the terminals are R,C, G, W1 and ...
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Wiring problems for new Wi-Fi thermostat

I am trying to install a RTH9585wF smart color thermostat for my family room heat and A/C. I ran a new C wire from my boiler to the thermostat yesterday and connected it to a 24 volt transformer on ...
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3 answers
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Fridge Thermostat Replacement - Terminals Differ. Wiring Help - RLA36G.1 (UK)

TL;DR: Can this be wired up to work? More images: https://imgur.com/a/qQcZXpL enter image description here (You can't tell because of the flash--but the two browns that connect next to each other on ...
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How do I replace my old Honeywell thermostat with a Nest?

Just moved to a 1985 built house in Ontario, Canada that has a Honeywell thermostat that I'm trying to replace with a Nest. I am unable to understand the labeling of the current thermostat as the ...
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Thermostat running past set temperature of heat

Heat keeps running after it reaches set temp. I have replaced the system with a new Honeywell (non-programmable) Thermostat. (I even tried that twice). Replaced the Fan Relay as well. Maintenance ...
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Wiring question wifi thermostats (Home wired with 2 wire)

I have a home that has 6 thermostats all wired with 2 wire. The homes heat is operated by a boiler connected to Honeywell zone valves. I am trying to install wifi thermostats and was wondering if it ...
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Upstairs heating zone wont turn off

I have two zones in my house, upstairs & downstairs. Baseboard heat/ boiler/ propane. I noticed that regardless of the thermostat reading (nonprogrammable circle honeywell heat only) i can feel ...
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Changing from a tekmar 518 to vivint smart thermostat

I want to change my tekmar 518 thermostat to a Vivint smart thermostat. The issue I'm having is that the tekmar has an R and an RH wire and the Vivint thermostat only has slots for an RC and an RH ...
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Blue wire is used on furnace, but not thermostat

When I looked at the wires behind the thermostat, the blue wire wasn’t used. However when I look at the furnace, the blue wire is connected. I’m not sure if I should use that as the C wire. I did try ...
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Where do I connect to C common wire to my old Burnham oil furnace

I'm trying to install a nest thermostat to my old Burnham oil furnace. Can anyone please tell me where to connect the C common wire that the nest requires? I have three zone heat with red and white ...
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Wifi thermostat to replace old mechanical 2-wire 110V Honeywell?

I have hydronic baseboard heating in my house, which is controlled by an old mechanical Honeywell thermostat. The Honeywell is 110V and connected with 2 wires (black/red). There is a bare ground wire ...
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Would it be dangerous to tap an existing flame sensor circuit to create a common connection for my thermostat?

I'm considering using this answer to connect a common wire to my thermostat. I have the exact same setup, and have verified with my multimiter that the red T terminal outside F terminal beeps, while ...
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Viconics E117 / P117 replacement by Honeywell Lyric T5

I just moved into my old neighbourhood after being away for 15 years. We bought this old house (1957) and it seems that the heating/cooling system got changed through times (Oil to electric in 2001 ...
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Nest Thermostat - Furnace not turning on but AC does when asking for heat

This is what my old thermostat wiring looks like, and everything was working fine: Green, Yellow, White, Red, RH and RC are connected. The blue cable is there but I have no idea what it does I ...
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Anyone connect the MasterStat Model 110423-2 three lines to Google Nest thermostat?

I have read the poster here: Controlling 110v swamp cooler using Nest thermostat about how to control the swamp cooler using the nest. However, I don't have reputation to post comments to that post ...
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Nest thermostat issue - only blows hot air if heat is on and fan is forced on. No air circulation with heat only

A few months ago I installed a nest thermostat and everything worked fine. I ended up giving that one away and installed another one A few days ago. It worked for one day and then it stopped heating. ...
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2 answers
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Baseboard heaters turn off before reaching desired temp

We recently renovated our condo and replaced the baseboard heaters. An licensed electrician did all of the electrical. Now, during a cold snap, the heaters on one thermostat are turning on and off, ...
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1 vote
1 answer
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Where to connect common wire from thermostat to First Co. air handler?

I'm trying to install a new Honeywell WiFi 9000 thermostat which requires a common wire. When I removed my old thermostat, I can see there are two extra wires in my wall (black and orange wire) that ...
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How to configure Honeywell combine W2/AUX/E terminal for Emergency heat?

I have a Honeywell RTH9585WF1012 to control my forced air furnace system which has: Cool: 1-stage heat pump Heat: 1-stage heat pump (same) + Expensive emergency gaz heat from furnace. Older ...
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Do wall-mount thermostats with remote sensors exist? [closed]

I read Replacing a Honeywell Thermostat with a remote thermostat, but the question/answer there doesn't quite fit my need. I have a thermostat wired into the wall, but it's not in a good place. I don'...
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How do I wire Honeywell RTH6500 Thermostat?

I have an old battery powered HW thermostat using 4 wires (W Y G R). I intend to replace it with a Honeywell RTH6500WF using a 24v power adapter, hook the adapter’s 2 wires directly to the baseplate ...
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2 answers
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2 wire thermostat, control relay

I currently have a 750mv propane stove in my living room. It is connected to a battery powered Honeywell programmable thermostat with 2 wires. The thermostat supports AC and fan. I have in my living ...
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How to test whether or not a breaker is powering a zone valve and thermostat?

I have a fuel burner (fuel oil) that heats water and provides my home with baseboard heat. I have two thermostats and zone valves, both by White Rogers (and both pretty old): one set for the ...
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Rated ampacity of water heater thermostat

What is the rated ampacity of "standard" water heater thermostats? The kind you see all over the place from a million different vendors. I cannot seem to find an electrical data sheet on any ...
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1 vote
1 answer
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Thermostat keeps switching on aux heat unnecessarily

I have a basic dumb Honeywell thermostat (TH5220D) that very eagarly switches to aux heat (electric) when set above 73˚F, despite outdoor temperatures being nowhere near low enough to preclude ...
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Adding switch to thermostat to control remote fan

A room at the end of my HVAC forced air is cold due to lack of air flow. I’d like to add a booster fan to help with airspeed and I’d like it to turn on/off based on the thermostat switch turning the ...
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