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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161 views

Why does my non-vented gas fireplace turn off after a few minutes?

I have a non vented gas fireplace, brand new, it has a screen on the front and logs. The pilot light is strong and stays lit, however the main flames turn off after a few minutes even when the ...
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194 views

Smart Thermostat and 24 volt transformer direct to thermostat

I have a hot water boiler and separate AC system and bought a wifi smart honeywell thermostat to get a C wire- installed a 24 volt transformer that has two wires if one goes to the C where should the ...
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1k views

Honeywell TH6110D1005 Thermostat keeps resetting itself

I have a Honeywell TH6110D1005 thermostat. I do not use the program mode, I keep my temp set to 71° at all times when it is on the Cool setting. Sometimes, it resets itself to 65° for no reason ...
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53 views

Install in a series - Electric heating thermostats, wireless communicating, 3000W for an Manufactured home/RV

The instructions on the Sinopé GT125-K2 Starter states, "the thermostat must be installed in series". A series meaning the "L1" (hot line in) connects to another outlet on a circuit line? What risks ...
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732 views

Wiring a C (common) wire to a Triangle Tube Prestige Excellence 110?

Wiring noob here. Can someone give me step-by-step instructions for where and how I should attach a C (common) wire to a Triangle Tube Prestige Excellence 110 boiler for a ecobee3 thermostat? I think ...
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79 views

What is this device connected to my HVAC unit?

I have this device connected to my HVAC unit in my apartment. I only have it in two of my rooms. In one of the other rooms I do not have this unit and was able to install an ecobee seamlessly. However,...
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1answer
6k views

Electrical Outlet - Red and black wire to L1 T1

Background: I removed an in line wall heater thermostat from a 120v outlet, and want to ensure I reconnect the wires accurately. Question: A google search hit insists the wire marked in red is ...
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225 views

How to wire new Honeywell smart wifi thermostate( RTH9590WF) to replace older Honeywell thermostat using only 3 wires

Old thermostat was only using 3 wires, connected to W, G and R-Rc jumper. no C wire. Does have extra wires not being used at each end. Big question is what to I connect to at the furnace for a power ...
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59 views

Can 7 day programmable thermostats typically be programmed with each day the same without having to duplicate?

I only need 2 settings for my heating, one for night and another for day since we're basically at home all day every day. We have a ground source/underfloor setup which was designed to run primarily ...
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2answers
151 views

Smart wall heater thermostat line voltage from high to low.

Cadet's blog provided an approach on connecting a smart thermostat to a Com-Pak wall heater by connecting it to a relay/transformer. They have recently updated and changed their post to not recommend ...
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390 views

How to reduce temperature difference between the second floor and basement?

I have one thermostat on the second floor and while it is achievable to get a desired temperature on the second floor, the basement is always cold.
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How to add C-wire from Laars mini-term

Folks, I am having problems connecting my Nest thermostat to a boiler. Given Laars Mini-term JVS series with Temperature Control PCB Module (pictured below) When I short Com call and Heat call wires ...
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63 views

Why Does My Heil Furnace Start When It Should Be Off?

My Heil furnace starts with the thermostat set to off. I disconnected the thermostat wires at the thermostat and it still starts randomly. I disconnected the heating wire at the board and it still ...
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1answer
58 views

Thermostat installed, but why also install a separate timer?

Our home is 8 years old. We always assumed the thermostat didn't work so we ignored it, but a plumber came to remove air bubbles from our radiant heating pipes and told my wife he thinks the ...
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2answers
8k views

Can I run my furnace in fan-only mode without a G wire?

The house I bought has a programmable Honeywell furnace. It only has a 2 wires connected to it - a black wire and a white wire. The heating system is working fine, except that when the heater is not ...
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4k views

Why is my indoor A/C Blower randomly turning on and off only with Nest?

I recently purchased a Nest Thermostat (3rd Generation). My old thermostat was working perfectly. I wired Nest the Same exact wiring as the old thermostat which is : Y1 W1 G RH RC. With Nest, the ...
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965 views

Controlling separate heat and AC units from a single thermostat

I currently have central air in the attic and furnace in the basement for the heat (steam radiator heat). I have both wires run to the same location but have two thermostats. Can I wire them both to ...
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150 views

C Wire in HVAC Unit

I am looking to install a new style thermostat in my apartment and it requires a C wire. I do have an extra wire run from my HVAC unit to where my thermostat is. But when tracing it back to my HVAC ...
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2answers
3k views

Nest Thermostat Wiring for Baseboard Heaters

I'm using a Nest Thermostat to power baseboard heaters (240VAC). I have 4 wires that I have access to: 2 wires: Red/Black from a transformer which outputs 24VAC 2 wires: 24VAC from a thermostat ...
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1answer
72 views

How can I add “smart” functionality to an old thermostat?

I recently moved to an apartment, and my roommate and I were talking about how much better it would be if we had a smart thermostat. We're going to ask the landlord about an upgrade, but I thought I ...
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1answer
1k views

Replacement thermostat wiring for new Honeywell Wifi model

I moved into a home recently and found the old thermostat temperature controls to be inaccurate at turning on and turning off A/C as set so I purchased a Honeywell RTH6580WF thermostat as a ...
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1answer
52 views

Need help disassembling Groehe shower thermostat

I have what I think is a Grohe 19624 Shower thermostat like this the one shown here: http://www.guillens.com/index.jsp?path=product&part=392046. It is leaking and I need to get it apart to ...
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2k views

How to find the right thermostat for my gas fireplace?

I have a Superior SSDVR3530CNM gas fireplace, which I'm trying to find a proper thermostat for. The manual recommends this one: However, it doesn't seem like they are sold anymore. (Or I'm not ...
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73 views

Please help me! [closed]

When setting my programmable thermostat should the 'heat to' or the 'cool to' setting be higher? Please ask me if you need any more info to answer this question
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372 views

Added a new 5th wire for my wi-fi thermostat, now where to connect it?

4 wires at thermostat: R G B W (red green blue white) 5 screws at furnace: G C W Y R Single-stage gas furnace with A/C unit The home's previous owners kind of did everything in a very make-shift way. ...
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344 views

Installing new thermostat without a C wire. Can I use my heater/R wire instead? Random 13V as well

I'm installing a thermostat, but I don't appear to have a C wire. My old thermostat had R/RH,Y,G,and W. It's an AC system that was setup before I got here. The actual AC unit is a long way away and ...
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3answers
79 views

selectable thermostats?

I would like to add a second, remote thermostat to my exiting HVAC system so that I can choose which area of the house will control the heating/cooling. I think I can do this by placing a simple on/...
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2k views

How do I make a 110V fan turn on when the thermostat turns the AC on?

I have installed a new a/c with thermostat...easy enough, but thought to add a fan to the mix. Basically, I'd like to add a fan to increase ventilation into a second room that would turn on whenever ...
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2answers
269 views

parallel thermostat

I have a venter room heater in a cabin. It uses a milivo;t thermostat. I am hooking it up to a wifi thermostat using a relay and 24 volt power supply. My concern is that if the power goes off that the ...
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1answer
326 views

HVAC Fan Set to Continuous By Landlord- Please help me rewire

I live in an apartment in which the landlord has set the HVAC fan to be continuously blowing even with Auto Fan setting on. Fan will also blow when Thermostat is turned off. Please help me rewire ...
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94 views

Is it safe to replace the thermostat when furnace is shut off?

I need to replace the thermostat in my basement. It is an old style round shape Honeywell mechanical non-programmable thermostat. The gas furnace is turned off (The switch is at OFF now). Is it ...
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53 views

Added load to thermostat circuit?

I have a couple Nest thermostats that I want to power when my boiler is powered off. My plan is to hook them up to a 24v transformer using the existing R/W wires (no C wire and I don't want to run ...
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2k views

Can the cooling wire (Y) be used to activate the furnace fan with a programmable thermostat?

Simple question I think, but you guys make the call. Can the cooling wire (Y) be used to activate the furnace fan? My neighbor has a Honeywell RTH7400 programmable thermostat used for natural gas ...
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1answer
639 views

Have I got a faulty thermostat in my fridge freezer?

I'm wondering if a faulty thermostat is what is causing my fridge freezer to misbehave? The fridge gets down to 12C, and the freezer to -20C or so, then the compressor does nothing for hours and it ...
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2answers
7k views

Need help wiring a new double pole line voltage thermostat

[ Just bought my first home and this is my first time posting, so please forgive me if my terminology is incorrect. I currently have bedrooms upstairs each with 1 baseboard heater and thermostat for ...
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2answers
103 views

C wire - Where does it go?

Got a wifi thermostat. Behind the old thermostat was a blue wire. The other side of the blue wire in the equipment isn't plugged into anything. I need to get the 24v common hooked up to this blue ...
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2answers
2k views

Can I install two thermostats on one furnace/act unit? I will be using one in living room, the other in a hallway

The reason is that there is a gas fireplace(stove) in the living room that has the pilot on all year. Currently the thermostat is in the hall keeping the back of the house cool. The heat from the ...
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2answers
452 views

Zoned thermostat in every bedroom

I am getting a new AC and coils new use old one died This is for second floor where we have 4 bedrooms Question Is it possible to have thermostat in every bedroom Is it allowed under code ? What ...
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1answer
2k views

Multiple C wires? [duplicate]

I recently received a wifi enabled thermostat which I thought I could install easily since I saw an unused wire (Blue) which I assumed would be the C wire behind the current thermostat. When I went ...
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2k views

Trane Weathertron Stat to Honeywell RTH2510

I have a Trane Weathertron thermostat thst I am replacing with a New Honeywell RTH2510. This is a heat pump with auxiliary electric heat. The wires on the Tran thermostat are. R, T, O, G, Y, B, X2 ...
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1answer
808 views

wiring two thermostats in parallel [duplicate]

I wqant to add a wifi thermostat to a millivolt system. I would like to keep the current thermostat in case of power lost so that it would kick in at a minimum temp say 45 degrees. How do you wire a ...
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1answer
448 views

Finding “C” wire on old heat pump HVAC unit

I am wanting to replace my old round mercury filled Honeywell thermostat with a new wifi smart Honeywell thermostat, the only problems is I don't have a "C" wire on my current thermostat and need help ...
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1answer
845 views

Can I easily add a thermostat to a whole-house fan?

Is there a straightforward way to add a thermostat to an existing (basic no-frills) whole-house fan? I'd like to be able to set it to shut off when the outside temp rises to a certain point--so that ...
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1answer
78 views

How do I disable a main floor thermostat and add one in a basement suite?

We are thinking of renting out the main floor of our home but don't want the tenant to have control of the only thermostat. Perhaps we could disable the one on the Main floor and add one to the ...
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1answer
882 views

How to wire A/C Thermostat given different wiring conventions

I've just moved to a new apartment in which I'd like to replace the current central A/C thermostat with a new one with WIFI control. I hope it's possible! I have basic diy electric skills but no ...
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635 views

Adding a C wire

I know this question has been asked multiple times and I'm going to try some of the methods I have read in other threads but wanted to ask this question since I didn't see anyone else's wired the way ...
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2k views

Is Nest 3rd Gen Thermostat compatible as a replacement for Honeywell TH3110D1008

I have an Ultra-Zone EWC-ST-2E controller unit for my gas AC unit at home (heating and cooling). It is set for two zones. Where the first zone has to be on (heating or cooling) in order to enable to ...
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1answer
410 views

Wire in parallel thermostat and timer to an air extractor [duplicate]

as the title: i have a room with with a heat generation that i need to keep under a certain temperature. Anyhow, i want to grant a minimum of air circulation even if the temperature is not reached (...
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1answer
141 views

HVAC thermostat current

What is the typical current (in mA) carried by the 24v thermostat HVAC wire bundle in a typical low voltage application? I'm using 18/7 wire.
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3answers
7k views

How to move from RH/RC thermostat to C thermostat in AC only system?

I see this is a pretty common question, but the answer seems like it might be dependent on your thermostat and air handler, so I'm posting with my specific questions. I'm upgrading from a White ...

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