Skip to main content
Home Improvement

Questions tagged [thermostat]

Ask Question

Mechanical or electrical device used to control a heating, ventilation, and air conditioning (HVAC) system, or other temperature reliant system.

1,393 questions
Newest Active Bountied Unanswered
Filter by
Sorted by
Tagged with
1 vote
0 answers
7 views

The unit was operational up to a few days ago. No signs of trouble. I assume that the unit is getting electrical supply as I see no evidence of connection problems or tripped breakers, etc. The fan ...
gnicko's user avatar
  • 6,555
3 votes
1 answer
168 views

My home boiler is Worcester Bosch Greenstar 28i. The Hive SLR1c thermostat is now connected to it. The connection is as follows: I'd like to change this thermostat to Beok TGR85. From the manual, the ...
Donotalo's user avatar
  • 133
1 vote
1 answer
69 views

I’m trying to hookup a smart thermostat. Right now I have a thermostat with just the red and white wire hooked up at the thermostat and furnace. I do see I have the blue common wire but not used in ...
Joe's user avatar
  • 11
0 votes
1 answer
56 views

I have a new Buderus combi boiler (Logamax plus GB172i T50) fitted with its "smart" thermostat (Logmatic TC100.2). The thermostat works fine when I turn on and off the hot water (when it is ...
DDS's user avatar
  • 2,442
2 votes
1 answer
89 views

I have a Tekmar 519 controlling hydronic in-floor heat in one part of my house. I'm looking to replace it with a smart thermostat. The wiring looks fine, except... there are wires to both R and Rh and ...
Ian Greenleaf Young's user avatar
  • 143
0 votes
1 answer
45 views

Bought brand new Kingsman FVF 350 vent free natural gas stove to replace a procom vent free natural gas heat stove. Removed the procom and hooked up kingsman. The flame is full force and the flame ...
steph knight's user avatar
  • 1
4 votes
1 answer
214 views

I just enabled my furnace for the season, and found that while the three buttons at the bottom of the thermostat work fine, the three control buttons on the right no longer do anything. After a while ...
Ray Butterworth's user avatar
  • 1,275
0 votes
1 answer
211 views

My Honeywell thermostat doesn’t have any screws showing it’s held to the wall. How do I pull it apart so I can replace the battery because it says battery air on the screen. … How can I open this?
Guest's user avatar
  • 1
0 votes
1 answer
145 views

Extra info required that @DIY75 helpfully requested: Cylinder make:Range Tribune HE Immersion heaters: Thermowatt Alloy 800 Thermostat make:Timeguard Digital Economy 7 Programmer MCB make:BG CUMB16 I ...
Sepia's user avatar
  • 1
0 votes
0 answers
24 views

My Aube CT 240 system permits remote telephone access for my heating system, which includes multiple satellite thermostats in the house, but can it be modified or upgraded to use a smart Thermostat ...
Joel Bonner's user avatar
  • 1
1 vote
0 answers
79 views

The first picture shows how the old thermostat is wired. It controls a Lennox G16 series furnace (G16Q4X-75-S) and outdoor AC unit. Note the orange wire lead is exposed and not connected to anything....
downeyDIY's user avatar
  • 11
0 votes
0 answers
48 views

Scratching my head with this one. Trying to replace an old thermostat with a Nest E on my Weil-Mclain. I have a common wire connected to the "c" terminal but ~2volts between red and common ...
Brad's user avatar
  • 1
0 votes
0 answers
26 views

I am installing a thermostat for a heating floor, the UTN4, and my electrical box has two hot wires each carrying 120 V. The wiring diagram of the thermostat calls for connecting the hot wire to Line (...
Jacinthe's user avatar
  • 1
0 votes
1 answer
116 views

I would like to install a "smart" thermostat to control both a boiler (hot water heat) and an AC unit, each with its own transformer. I would like to run a C wire to supply constant power, ...
Eric R Peterson's user avatar
  • 1
4 votes
1 answer
389 views

All works fine but no G wire in the nest thermostat. 4 wire goes into the thermostat. I see a jumper between G and Y at the furnace end. I want to be able to control the fan only. Should I pull a new ...
sergio's user avatar
  • 133
1 vote
0 answers
71 views

I am trying to replace my old thermostat with a new Mysa one. The thermostat controls a single 240V heater. These photos show the current wiring. This is a schematic showing where each cable goes in ...
TheDutchDogtor's user avatar
  • 11
0 votes
0 answers
61 views

I tried looking through past threads on how to connect a c wire in boiler for a smart thermostat, but I'm still having some issues. I'm attaching images of the wiring. Can someone please help me with ...
Esther's user avatar
  • 1
0 votes
1 answer
96 views

I have a Chronotherm IV Plus. The System button is not functioning. Can the contact be accessed and cleaned?
paul's user avatar
  • 1
1 vote
0 answers
54 views

one of the thermostat wires got disconnected from the furnace. one is running to the blower motor switch. the other is dangling. it is bent like it was screwed to a terminal. need to know where to ...
tim's user avatar
  • 113
0 votes
0 answers
45 views

I have five wires in my Lennox furnace (Heat and cooling). I have a heat pump with aux heat. I connected R to R, G to G, Y to Y, W to W and B (W2) to O/B. When I try to configure Google Nest ...
Panneer Balasubramaniam's user avatar
  • 1
1 vote
2 answers
125 views

We are replacing our failing air conditioner and are considering heat pumps among the options. In heating mode, the heat pump would supplement our existing oil-fired boiler hydronic baseboard heat. I ...
daxelrod's user avatar
  • 115
1 vote
1 answer
80 views

My gas furnace has started to occasionally turn its self off after heating just fine for a while (10+ minutes) while the thermostat is still calling for heat. It does not do this every time and I have ...
DaveK's user avatar
  • 121
1 vote
0 answers
75 views

This thermostat, a non-programmable Honeywell RTH111B, stopped working. We noticed the heat wasn't coming on when it should. When we pushed firmly on the face of the thermostat, it would suddenly ...
nuggethead's user avatar
  • 2,021
0 votes
2 answers
389 views

I've had a professional install a new digital & programmable thermostat (Honeywell RTH6360D) about 8-10 months ago. We have a heat pump and an electric furnace (AUX heat) and there are times (...
raddevus's user avatar
  • 495
0 votes
2 answers
112 views

I have a Lennox thermostat with a humidity sensor that is failing. I would like to install a humidistat rather than a new thermostat. Is it as easy as running one of the two wires going to the ...
Larlarc's user avatar
  • 1
1 vote
3 answers
672 views

I've seen questions similar to mine being asked before but every solution appears to be a "hack" that is likely to fail shortly after installation. I'm hoping that someone knows of an "...
MacGuffin's user avatar
  • 575
0 votes
0 answers
110 views

Pictures of existing thermostat setup. https://imgur.com/a/RqouEKN This controls 2 baseboard heaters in a cabin. The new thermostat shows this as the setup. I do see a bare copper wire in the back of ...
Cabin Newb's user avatar
  • 1
2 votes
4 answers
763 views

We live in a warm climate and rarely heat our tiny 2-floor townhouse fully, but when we do, we cannot use the existing electric heaters efficiently at all. We will be installing a floor heating system ...
Samil Can's user avatar
  • 61
0 votes
1 answer
93 views

My old thermostat only had two wires. One red and one white. Which two terminals do I use for an Emerson model st25u?
John Foster's user avatar
  • 1
0 votes
0 answers
39 views

I am trying to install a C wire on my Goodman ah2429-1 rev a. This is what is looks like now and the green wire is my free wire I need to hook up to the c connection https://drive.google.com/file/d/...
Danielle White's user avatar
  • 1
0 votes
1 answer
114 views

I have removed the thermostat (model Kdf29n4) from a faulty refrigerator, that all the time got so cold that everything froze, and now I want to test whether the thermostat is defective (or if the ...
Madamadam's user avatar
  • 103
0 votes
0 answers
39 views

I have an underfloor heating system with a Heatmiser UH8 and all the rooms have Heatmiser Slimline v2 wall mounted thermostats. In one of our rooms, the thermostat seems to be unable of detecting the ...
neildeadman's user avatar
  • 101
0 votes
1 answer
103 views

I've had this old thermostat on the wall since moving in. There's a 2nd, newer thermostat further down the wall that's actually controlling the furnace, this one has just been sitting there, with the ...
GtwoK's user avatar
  • 157
1 vote
1 answer
90 views

I have two Carrier 58SC0A070E17 HVAC units in a 2-story house. Most of the house living area is a 2-story atrium with bedroom and bathroom doors off to the sides. We run the downstairs unit in ...
Ron O's user avatar
  • 13
0 votes
2 answers
214 views

I have in-floor radiant heat in my house and almost every room is its own zone - there are 12 thermostats. I don't need 12 smart thermostats but I was wondering: how would one wire those if I did? I ...
DaveBurns's user avatar
  • 318
0 votes
0 answers
84 views

I have a Honeywell T87 to T9 thermostat with a Taco SR504 switching relay panel. I have the c-wire adapter and 2 wires. The instruction book does not have any wiring schematics in it for this ...
user402376's user avatar
  • 1
0 votes
0 answers
62 views

I recently noticed that my furnace has 2 different sets of wires coming off of it. to my knowledge the house only has a single thermostat, which is hooked up to one of the sets of wires. I don't know ...
setholopolus's user avatar
  • 109
0 votes
1 answer
149 views

What may be driving a 25% increase in electricity consumption? We've lived in this house for 3 years now. I just received my electric bill for December and the consumption is almost 25% higher than ...
2020db9's user avatar
  • 331
12 votes
7 answers
3k views

We just moved into a house that was built in 1905 and got our first utility bill... it was almost $800. ( $600+ of it was gas, from boiler). We are aware of our energy usage habits (bring temp down at ...
Alex's user avatar
  • 121
0 votes
1 answer
185 views

I have a Stelpro 750w baseboard and Stelpro thermostat st302np. Single pole thermostat 2 wires coming out and 2 hot wires coming from wall and ground. I am trying to figure out how to wire thermostat ...
Jim's user avatar
  • 1
1 vote
0 answers
59 views

Context: I'm a newbie in electrical wiring apologies if it's an obvious question. I'm trying my hand at installing the ecobee 3 lite thermostat replacing our existing old honeywell thermostat. We have ...
Ganesh Rajasekar's user avatar
  • 11
3 votes
1 answer
726 views

I currently have a 70s era standing pilot gas furnace and am trying to install a Nest (2020 version) thermostat. I know I have to add the "C" wire to my setup, but I am thinking something ...
NJDen's user avatar
  • 31
2 votes
1 answer
691 views

I'm trying to install a Mysa thermostat, which has 3 wires. A load wire, L1 (L) and L2 (N). It looks like this: My box has a total of 6 wires. I believe the 120 volt wires are twisted together (2 ...
Meowmix's user avatar
  • 23
0 votes
0 answers
49 views

Want to connect Emerson Sensi thermostat to Lennox icomfort furnace board. Presently four ports has wire: C, I-, I+ and R. Where do I connect I- and I+ on the new thermostat? C has blue and yellow, R ...
satish's user avatar
  • 1
0 votes
0 answers
71 views

Why might my gangbox have 6 wires? (plus 3 ground wires not in the picture) Two wires are connected to a mechanical thermostat controlling a 240v heater. The wires are labeled: load & line. The ...
bafuda's user avatar
  • 101
0 votes
0 answers
79 views

I have a wood stove that puts out good heat but is way on one side of the house. I'd like to use my Nest thermostat to cycle the furnace blower, but the furnace control unit doesn't seem to support a ...
sam's user avatar
  • 23
0 votes
0 answers
63 views

So its just the beginning of the cold weather, so we dont open the heat all day today night, we set the thermostat to 21.5 Celsius, it start heating and then went blank I notice that while blank the ...
Ali's user avatar
  • 59
1 vote
0 answers
138 views

I have a thermostatically controlled gas fireplace that is about 4 years old and the issue is that the most of the time it works properly, set it at 72° and the flame turns off at 74º+/-, but ...
David Petty's user avatar
  • 11
0 votes
0 answers
108 views

My home had an old, simple Honeywell thermostat that was working completely fine. See the photograph attached for wiring information. I am in Texas, so I have both an external AC compressor and a ...
MisterStrickland's user avatar
  • 595
0 votes
2 answers
197 views

We just moved in and tried to replace a Honeywell Thermostat with the Nest Learning Thermostat Gen 3. Looks like the heat function is only blowing cool air, so we think we wired things incorrectly, ...
Miche T's user avatar
  • 11

1
2 3 4 5
…
28