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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10 views

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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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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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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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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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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61 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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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56 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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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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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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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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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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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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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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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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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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Thermostat wiring: heat and fan of but AC not cooling & 2 disconnected wires!

I moved to a new home last winter. I have a PTAC unit. Fan is working well, same with the heat over the winter. The building has changed the building's system to cooling for the summer but ...
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R and C wiring for Air Handler and Zone Panel

First time posting a question! But have been reading the questions/answers here for a while now. Ok- so I have a brand new Goodman Heat Pump system (GSZC + AVPTC air handler) I’ve installed in my ...
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133 views

Help needed on thermostat wiring with Ecobee and Fast-Stat 5000

I'm trying to replace existing Honeywell controller for my furnace with Ecobee 3. The Honeywell controller does not use a C wire, however there are a black wire and blue wire in the wall behind the ...
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C-wire on Weil McLain cGA Gold has low voltage

I am trying to run a new c-wire for my new ecobee thermostat. When I finished running the c-wire from the thermostat it did not turn on. I tested the voltage at the boiler and it is only reading 17ac ...
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Is the Y terminal on a furnace the same a the Y/Y2 terminal

Probably a simple question, but as the title says, on the furnace side, is the Y/Y2 terminal the same as a Y terminal? My furnace has Y1 and Y/Y2 terminals. The Honeywell thermosate says to jump the Y ...
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Why does my thermostat require 240volts?

Purchased smart thermostat from China still in transit, my old thermostat has two wires only from ducted gas heating unit was powered by 2-1.5 volt batteries. The new thermostat requires a hard wire ...
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No Power to Thermostats - Even after Replacing

I changed my thermostats from Honeywell Smart TH6220wf2006/u Lyric T6 Pro WiFi to Honeywell T5 Programmable (NOT Smart) and couldn't get my furnace to push air out, but AC worked fine. A friend was ...
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Nest 3rd gen thermostat N72 Error Does not detect Power from Rh wire

I just hooked my Nest 3rd gen thermostat to my split heating/cooling system with a Common wire coming from the air handler in my ceiling. On my old stat I didnt use a common because it was battery ...
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170 views

Help with installing the Honeywell T5 - RCHT8610WF2006

I recently bought the Honeywell Lyric T5 Wi-Fi Smart Thermostat - RCHT8610WF2006 and am having a hard time installing it. As far as I can tell, the heating works but the cooling doesn't. Instead of ...
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What should the ohm, resistance, reading of a dishwasher thermostat be?

The schematic doesn't say that I can see. What should a "normal" resistance reading be for a dishwasher thermostat? I do have continuity. I read 1.3 or thereabouts. It is a Kenmore, but ...
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Honeywell RTH9585WF thermostat behavior with heat pump and Emergency heat

I just installed a Honeywell RTH9585WF1012 to control my forced air furnace system which has: Cool: 1-stage heat pump Heat: 1-stage heat pump (same) + emergency gaz heat from furnace I have a fossil ...
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Do smart or programmable thermostats actually save money?

I am looking at replacing all the thermostats in my house. I have hot water baseboard heat and forced air A/C. Each room's baseboard heat is controlled by a thermostat in that room. I tend to prefer ...
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Condo Heating Question

I'm a new condo owner and I have realized my hot water baseboard heaters won't turn off. It's getting hotter where I'm living and when I put my thermostat (old mercury Honeywell) to the lowest setting,...
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Is this blue wire in my A/C a C wire I can use at the thermostat?

Here's my current setup - separate A/C and boiler units. Some of the pictures may be confusing because the wires are differently colored than they're named, but I'm going by my actual thermostat. ...
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Trying to wire for Ecobee thermostat

I have an ecobee thermostat I'm trying to hook up, but I can't figure the wiring out. We have fuel-oil boiler and an AC, with the oil boiler using radiant water pipes (as well as heating our water for ...

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