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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14 views

Furnace has G (Fan) terminal but no wire can I connect it to my thermostat?

My goal is to add support for my furnace fan on my Nest Thermostat. Looking at the furnace the board has many terminals, but not all are connected. Can I connect the G terminal to the G terminal on my ...
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Want to add a C-wire to a ClimateMaster Compact Heat Pump in combination with a Nest learning thermostat

My existing Nest learning thermostat, 3rd gen, is draining the battery really fast when use the wifi. I have a ClimateMaster Water Source Heat Pump. It has only four wires. I run an extra wire to ...
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26 views

Adding a C Wire to a wall mounted gas heater for a WiFI Thermostat

I have a typical 2 wire thermostat for a wall mounted propane heater. I want to install a wifi honeywell thermostat. The thermostat is right next to the heater so running a third wire is no problem I ...
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41 views

Nest Thermostat Wiring problem - Heat does not work

I recently replaced my old American Standard thermostat with Google Nest. Cooling works fine but Heat does not work and simply goes into an unending loop of 'delayed: will start in 2:30 secs' I think ...
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U.K. Nest E Installation

Currently an ideal logic c30 combi with a wireless thermostat on the wall. I took off the cover of the wireless controller and can’t work out the wiring to go in the heatlink. The app guides me ...
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2answers
40 views

Google Nest E - incorrectly wired? (UK)

I've just installed a Nest E in place of our old thermostat and it doesn't appear to be working correctly. The Nest E and the Heat Link both communicate with each other fine but when the power is ...
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21 views

Turning thermostat controlled appliance by switch

I have 18/3 thermostat cable running from the thermostat to the gas hydronic boiler. I think only two of the 3 wires inside are used in its most basic function. A feature I would like to add is to be ...
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Installing Ecobee 3 Lite - Confusing HVAC Wiring

I'm installing an Ecobee 3 Lite thermostat. I needed to add the PEK at the HVAC control board. Here's the original wiring of the HVAC Control board. As you can see, there are 2 wires at the Y spot. I ...
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Replace pneumatic thermostat without running new wires [closed]

I am in a high rise built in the early seventies. The hot water is provided by the building gas furnace, it heats the apartment via baseboard radiators. I have a downright ancient thermostat on the ...
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Can I replace this old mercury thermostat with a digital one for wood/oil furnace?

I recently moved into a house that was built around 1999, and it has an old Newmac wood/oil combo furnace that seems to be the original heating equipment. It has two separate thermostats in the ...
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Why is my TH132 thermostat display going blank?

I have electric underfloor heating with a TH132 that is not working as the display keeps going blank and appearing to reset. Will replacing this with the TH232 resolve the problem?
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How should I connect a Honeywell T2 with no C or Y wire?

Hello everyone I am a DIY type of guy but I’ve possibly bit off more than I can chew. Our older LUX thermostat was not cooling the house, so I was told to replace it. I did. Well, now the ac does not ...
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Honeywell T6360 wiring from Hive

I’m wanting to swap my thermostat over from a Hive one to Honeywell. I’ve attached a photo of the current Hive wiring and the new thermostat. Please can someone guide me on how to move the wiring over?...
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Electric floor heating thermostat that is also silent

I would like to install electric radiant heating in my bedroom floors. But all thermostats with floor sensors utilize a powerful relay that makes a loud clicking noise every time it comes on and off. ...
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106 views

Please help me find the right spot to tap into for C wire at the furnace

I am trying to upgrade our thermostat to a Wifi unit that needs a C-wire. Found the unused C wire at the thermostat end and connected it. AC wouldn't power on, went to furnace end and found it wasn'...
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Replacing old V+/Vg carrier thermostat with Honeywell programmable thermostat

I have a heat-only natural gas furnace with a fan. (Bryant 315aav036070adja) The thermostat I'm trying to install is a Honeywell TH4110U2005/U. My old thermostat only has two wires (V+ and Vg), which ...
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28V at furnace, 0V at previously working thermostat

This is a followup to an earlier question I posted where it appeared that the previously unused Common wire on my HVAC system was damaged. All of the other wires read 28V between them and R, and the ...
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62 views

Low voltage over C wire at thermostat

Similarly to this question of the same name, I am reading low voltage over the R,C wires at the thermostat. Unlike that question, however, the voltage is unusably low. I am only reading 2V over R,C ...
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1answer
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DCS RGU 366 oven doesn't turn on

I have: DCS RGU 366-N oven Symptom: When I try to start oven, the ring lights will light up, but gas never flows, and ignition never starts. Checked: The stove burners work. I hear the relais click ...
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74 views

Wiring smart thermostat with existing wire?

I've had a thermostat(2xAAA powered) for my gas heater wired via two wires from the second to first floor. My question is I'm looking into the actual wire that is in the wall and it looks like either ...
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16 views

Replacing thermostat receivers

I am about to replace a BOSS RF receiver with a Hive one. The BOSS receiver has LX (common), L, N, L1 (live feed to item to be controlled) and L2 (changeover contact). The Hive one has N, L, common ...
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77 views

Adding a C wire for a Nest thermostat

I tried upgrading to a Nest thermostat, and that's how I discovered I don't have a C wire... I'm thinking how to add it. I have some interesting situation: single furnace, and 4 zones connected to it ...
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Optimal smart thermostat configuration for dual HVAC in 3 level home

I have a 3 level home with two independent HVAC systems. I've just moved in and am becoming acquainted with the systems, and am eager to get smart thermostat setup. I'd ultimately like a setup where ...
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39 views

HVAC Blower Fan stays on ALL THE TIME - Even when the system is off

My HVAC Blower fan stays on even when I remove the thermostat face plate (with the fan in the auto position and the thermostat in the off position). I have tested for a short in the thermostat wire ...
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66 views

Bypassing thermostat,

It is hot and my AC isn’t turning on. I bypassed the thermostat at the furnace, and the AC came on. How long can I leave the thermostat jumped? It is late and I can’t replace the thermostat until ...
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23 views

C wire not identified

I have the c wire which I removed and reinserted but still the thermostat showing error that its not identified
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55 views

Smart Thermostat with TWE040E13FB2

I have a trane TWE040E13FB2 hooked up to a heat pump. I am wanting to install a smart thermostat. Our current thermostat has 10 wires in it. I do not have a common wire. I also don't see a common wire ...
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57 views

Blower fan comes on once a week

I have basic two wire thermostat, one for power on for neutral. I only have central heat, not air. My blower fan kicked on the last two sundays, but itself, but not today which is sunday. It only ...
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36 views

Trane XV95 thermostat wiring

I have a Trane XV95 two stage furnace, wired up to a single stage thermostat. The W1 and W2 ports on the furnace are jumpered. Currently has a 4 wire cable. I'm trying to figure out if it's worth ...
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33 views

Thermotstat Wiring Confusion

I live in a condo with hot water baseboards that are connected to a shared boiler system. I currently have a simple bimetallic strip thermostat that I'd like to replace with a digital or a smart ...
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54 views

Why is the 'E' terminal connected on my thermostat?

I'm trying to update my Honeywell TH4210D1005 thermostat to a nest thermostat. On researching the Honeywell thermostat, it seems to be designed for systems with heat pumps? Further, it does have the E ...
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2answers
58 views

Installing c wire in older furnace

I just installed a nest thermostat and need to hookup the c wire inside the furnace. I read where you need to connect the c wire to the secondary wire on the 24v side of the transformer. There are 2 ...
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36 views

Options for smart thermostats with a 2 wire gangbox

I have baseboard heaters, and am interested in getting a smart thermostat like the Mysa. My existing thermostats are 2 Ouellet OTH600s (similar to this) and one Honeywell Linevoltpro. These control my ...
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112 views

Hive Wiring Advice - Combi Boiler

I've just moved house and am trying to wire up the hive (as I did in my previous house with no problems). I have a combi boiler (Ideal Logic 30) and a single-channel hive receiver. The old thermostat (...
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23 views

Trying to wire a nest thermostat E in UK with 2 live wire and 2 neutrals

I live in the UK and am trying to replace a Honeywell WiFi thermostat with a Google Nest thermostat E. I have 2 3-core wires coming into my thermostat, 2 live and 2 neutral wires, 1 pair I believe are ...
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61 views

For a smart thermostat, where do I attach the C wire to my furnace?

I know I've seen several questions out there about getting a C wire for a smart thermostat, however after all the research I've done and people who have given me guidance so far I have still had no ...
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29 views

Thermostat wiring help?

Can anyone tell me what’s going on with my thermostat wiring? Some are pretty straight forward but my questions are: why is my G wire blue? And why does my Y terminal have a white and yellow wire ...
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59 views

C wire for wifi thermostat

I'm at a loss. I have a wifi thermostat to install. No c wire connected so a 4 wire thermostat but have 4 additional wires unused. I checked our Goodman ac/furnace and found the unused blue wire. The ...
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96 views

Hooking up AC compressor to an old Lennox furnace

I'm trying to connect an ac compressor to an old Lennox G12Q3-110-3 furnace. Tried it a couple of ways and can either get the compressor to turn on or the furnace fan. Not both. Any ideas on how to ...
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61 views

Proper replacement for dying Honeywell Thermostat

I have a Honeywell TH800 Series thermostat controlling a heat-pump and furnace for forced air and aux heat. Last week the touchscreen stopped responding. After playing around with it I took it off its ...
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32 views

Nest Thermostat wiring for heat pump

I am trying to replace my Honeywell Thermostat that is connected to a Honeywell EIM with a Nest Thermostat. I only have a 4 wire (G,B,R and W) ran from the EIM to the thermostat. My understanding is I ...
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39 views

Can anyone tell me where I can get a replacement thermostat(see PicS)

Just wondering if anyone can tell me where to get a replacement thermostat for the one in the pics. I put it in in 2010 and I'll be darned if I can find a replacement. It's a three wire RWG Thanks Thx
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Family installed a new Nest thermostat without photos of old wiring. Please help rewire 4-wire system to restore AC functionality!

Photo Album of current furnace, setup, and wiring: https://imgur.com/a/VYa2MnT Hi guys, I'm in town visiting my family for the summer. They installed a Nest thermostat without taking any photos of the ...
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108 views

Why do heat pumps use a separate “reversing” signal from thermostats?

Thermostats use a W signal to call for heat and Y for cool. For heat pumps they also have an O or a B signal to "reverse" the pump into the appropriate heating or cooling mode. Why two ...
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56 views

Why is the aux indicator on my HVAC system lighting up when A/C is called for?

HVAC novice. New professionally installed heat pump (Goodman) and air handler. Old thermostat from the early 90’s. No aux heater installed. My assumption is the landlord wanted to save money and in CA ...
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Swap 2nd thermostat for *off* swtich downstream of 1st thermostat

I have two thermostats running two different fans wired up like this: I'd like to replace the 2nd thermostat (on the right, in box #2) with a switch. I have done this and have the ability to turn Fan ...
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How should I connect new thermostat wires to my heat pump?

I need some direction on troubleshooting my HVAC heat pump. I have recently purchased an older home with a newer heat pump was installed. There was no power to the thermostat. Called repairman and he ...
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60 views

I need a C wire connection for my new Glas thermostat

I have 3 wires(red,white,and green) going to my thermostat. I’m replacing my old thermostat with a new one the requires a C wire connection. The 3 wires goes to my Honeywell aquastat. The white goes ...
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Confused about HVAC wires

My townhome is using a heat pump and it's currently connected to a honeywell 3000 thermostat. I bought a gen 3 nest and from what I can tell, it's compatible. However, I'm a bit confused about my ...
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36 views

Fresh Air Ventilation Humidity Issues

We moved in a few months ago to a new construction home and had noticed very high humidity inside our house, sometimes about 70-80%. When moving in the builders explained to us about the fresh air ...

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