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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48 views

How to connect 4 fan coils with one wall control thermostat?

I have 4 fan coils (Sabiana sk-22)and I want to connect them with one wall control thermostat. How can I do?
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704 views

Replaced Thermostat, Furnace worked for 1 cycle now blows cold

Hello I just replaced my old White-Rodgers thermostat because it just wasn't working consistently (sometimes it would turn on the furnace, but mostly it wouldn't). I swapped it with a White-Rodgers ...
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Why would one of the zones of my Slant Fin gas fired hot water baseboard heating system not be heating?

Thus far I have: replaced with new batteries. turned down temp and switched the breakers turned heat back up, no response Can a pilot be out for one zone? The other two are warm and cozy. Did the ...
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321 views

Why won't a NEST that shares control of a furnace with a conventional thermostat turn on the heat?

I have three floors in my home. The bottom floor has its own gas furnace and the 2nd and 3rd floors share another gas furnace. Everything was working great until I added a NEST to the first and ...
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120 views

Why doesn't my A/C get power when using the alternate C-wire thermostat hook-up method?

I changed my old Honeywell thermostat for a new Honeywell WiFi thermostat. I installed it just as the directions stated. I used the alternate C-wire method as the old unit did not have one. ...
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3k views

Fan works for heating, but not for AC, where to start?

Our new place has a working AC (meaning that the physical box outside spins and can produce cold air) and a working fan (meaning that the fan spins and is able to put air out to the vents in the house)...
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1answer
780 views

Temperature in Condo hotter than thermostat setting- Gas Furnace

I recently bought my first place (a condo) and I have a gas furnace. The thermostat is set for 72 and most of the time it seems to be following this alright but periodically even though the thermostat ...
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1answer
830 views

How can I consolidate different heating/cooling systems into a single system?

I have 3 different types of heating/cooling systems that I inherited. Hot water heat. This heats the whole house/garage via 3 zones. Zone 1: Kitchen/Livingroom Zone 2: Bedrooms/Bath Zone 3: Garage ...
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2k views

How to connect Nest in Europe

I found a question regarding the Nest thermostat here. But that is only a question "Will it work?". Thanks to that I know it WILL, the problem is...HOW. I know the wire naming conventions are ...
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25 views

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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23 views

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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14 views

Thermostat wiring in need of fixing

I am trying to install a new smart thermostat and the control wire is not working (it controlled the heat fine in the winter.) I came out to my air handler and this is the wiring I’m looking at ...
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33 views

Install towel warmer on a thermostat

I am considering purchasing this towel warmer Model AN-5309 for my bathroom. I am setup to hard wire the device. I would like to attach this to a programmable wall thermostat. Can anyone confirm ...
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30 views

Why does the GFCI protecting my in-floor heat trip when the bath fan is switched off?

The in-floor thermostat (Laticrete, model TH115-AF-GA) with built in GFIC trips sporadically after I turn off the bathroom fan. The floor heat is on a separate 15 amp circuit. The lights and fan are ...
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52 views

How to install a thermostat for electric heat?

I have a 240v electric heat in my house. I’m trying to switch my thermostat from an old Mears to a new Mysa smart thermostat. I have six wires coming from the gang box. 1 set is to the heater( load) ...
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34 views

HVAC furnance runs for awhile, stops for 2 minutes, then starts back up and continues to heat until set point reached

I have a Carrier 58GS150 system. At night it is set to 69. In the morning it is set to 72. Recently, I replaced the air filter. The system starts up fine in the morning and tries to reach 72. ...
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1answer
36 views

heat is not responding to thermostat set temp but comes on when turned off and back on with the thermostat switch

At times during the day my gas burner doesn't try to come back up to the set temperature on the upstairs or downstairs main thermostat. I'll hit the up button a couple of degrees but no change. Then ...
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1answer
49 views

Nest snow thermostat with a McLain PEG-45 boiler

I have a similar problem . My R wire from the thermostat to the G terminal on boiler and the W wire from the thermostat to the Y terminal on the boiler. The picture is a bit confusing since the red ...
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1answer
65 views

Why is thermostat calling for cool when set to heat

I have a White Rodgers 1F97-1277 thermostat. I set it to call for emergency (propane) heat on my York heat pump. Display shows 'Heat - Stage 1'. When I look at the furnace, no heat and no flame. The ...
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HVAC Gas furnace with added heat pump. Thermostat loses power while heating with gas

I have a medium efficiency gas furnace with an add-on Trane air to air heat pump. The heat pump kit is TAYPLUS103A. I noticed that in cold weather when the gas furnace runs, the gas ignites, and ...
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35 views

Will a standard wifi enabled light switch between an indirect water heater and the furnace stop the heat call?

We have a Honeywell thermostat on an indirect water heater that ties to one of the zones on a furnace in a vacation home. I'd like to be able to stop the call to heat the water if the house will be ...
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44 views

How to wire 7-wire thermostat and restart

We setup a sensi smart thermostat by combining the Blue and Orange wire into the O/B connector and Black to C. This had the heat and fans working but NOT cooling. We adjusted by trying to put Blue ...
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36 views

HVAC trying wire new thermostat old trane to new sensi smart touch

My old trane thermostat b modle # 3AAT80B1A1 has wires R red T tan O orange G green Y yellow X2 Black B blue U green W white new thermostat has RH power heating with jumper built in to RC cooling C ...
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20 views

What is causing my ac unit and thermostat not to work with one another

Inside unit and thermostat are not working properly. In the beginning, something needed to be changed in it,it was a small black box and a round cylinder like plug thing.changed out the thermostat ...
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1answer
31 views

Determining what zones are controlled by which thermostat

I purchased a quad plex. We live in the double unit on the first floor and have one thermostat which seems to call for heat in our zone. On the second floor there are 2 units with seperate thermostats ...
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1answer
51 views

C-wire help needed with Nest thermostat install

My air handler (see photo) connections are G,W,Y,R and COM. The a/c compressor (outside) is connected to air handler Y and COM. I have 5 wires out to the thermostat, G,W,Y,Rh with jumper to Rc, and an ...
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52 views

Installed Honeywell T5 Thermostat Now No Heat or AC

I installed a new Honeywell T5 Smart Thermostat. All wiring appears to be correct, but I did blow the 5amp fuse in the handler while hooking it up. Replaced fuse, but still not able to get the AC or ...
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16 views

Wiring a Nest Thermostat E where current thermo feeds 2 controllers

Moderator, please don’t simply close this question if the other question asked wasn’t the same, and the answers weren’t applicable. That was sort of thoughtless. Not helpful. Thank you in advance - ...
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18 views

How do I calibrate a Totaline thermostat?

Our thermostat is not reading correctly how can I calibrate it? I searched the Totaline site and it seems like this particular product is not listed (and I can not find the model of this product), ...
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30 views

Can Honeywell c wire adapter or Venstar add-a-wire work with dual transformer system?

I have a dual transformer system where the baseboard heat (RH-W) and AC (RC-Y-G) are wired independently and currently it's working well on my Honeywell thermostat. I would like to buy a smart ...
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40 views

How to wire Minivector control relay for Honeywell Wifi Thermostat to control 240v baseboard heater

new here, and just a "homeowner electrician". When I bought the house there was a low voltage thermostat controlling a 240v Cadet baseboard heater. Upon investigation, there is a Minivector ...
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57 views

Thermostat C-wire not working

I recently switched out my old thermostat for a new thermostat. The previous thermostat had an R, Y, W, G, and C wire. I plugged all of these wires into the same ports on my new thermostat. After ...
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68 views

How do you connect a Nest thermostat to a Noritz CB199 DV combi boiler?

I have only one zone and I'm using the internal boiler pump. I do not have any zone valves. I have a 24v transformer and a White Rodgers 90-370 relay.
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32 views

Finding the Right Heating\AC Thermostat

I have a thermostat in my house that seems to have a very narrow temperature band. This causes it to cycle on and off more frequently that it probably should. I have noticed that when I set the ...
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52 views

My central heating comes on when it feels like it

I have checked the wireless thermostat is sending a demand signal to the receiver but boiler isn't firing up (BTW my hot water on demand is working fine). Later on the heating comes on until I turn it ...
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27 views

Heat pump thermostat wiring, can I leave the Optional C terminal empty?

We have an old Carrier Heat Pump system. The thermostat tells me that "C IS OPTIONAL WITH BATTERIES". The thermostat does have batteries. So I can leave the C terminal empty and use the ...
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198 views

Thermostat wiring identification - missing yellow wire/extra wires

Help please and apologies in advance for lack of technical knowledge! I'm looking to replace my old Honeywell 8022C 24v thermostat with a Nest, and have failed on several levels now I've taken a look ...
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140 views

Water heater not producing hot water but everything seems to be working?

We just bought a house and the previous owner had a brand new water heater installed. The first day we took a shower it was not very warm and the next day there was no hot water at all. I checked the ...
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27 views

Connecting New Thermostat C Wire To Transformer

Looking to add a C wire to my 2 zone system (new smart thermostat). Since the original wiring was 2 wire, I ran a new set of 5 wire lines. The link below shows how my current set-up is wired to the ...
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2answers
93 views

Ecobee 3 - I have 3 Wires

I have three wires coming to the existing, very old, thermostat: Black, but wired to the "R" terminal of the current thermostat. White, but wired to the "W" terminal of the ...
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33 views

AC not blowing cool air, Contractor said HVAC unit is perfectly fine and that it has to do with my smart thermostat (Ecobee 3)

So basically I changed out the filter on my HVAC unit (National Comfort Products, Model CPG41238-U23) and after I did that the AC stopped blowing out cold air. It was working completely fine until I ...
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29 views

Need help with thermostat wiring

I am trying to change from an American Standard AYSTAT655 to a Honeywell RTH8560D but wiring does not match anything in the Honeywell manual. Anyone able to assist?
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1answer
40 views

Use Honeywell VisionPro without EIM?

I just acquired a Honeywell VisionPro TH9421C1004 thermostat but I didn't get the Equipment Interface Module (EIM) with it. Can I still wire this directly from my furnace? It only has 3 wire ...
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15 views

Help with high limit thermostat replacement on Kenmore 110 series dryer?

My tenant’s dryer stopped heating, and when I took the back off to check the thermal coil the high limit thermostat fell into pieces. Ha, ok. Tested the circuit on the coil just in case and it’s fine. ...
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18 views

Furnace fan will not turn off

Our furnace fan runs continuously whether we have the switch set to ON or AUTOMATIC. How do we get the furnace fan to shut off without having to go downstairs and turning switch off manually?
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31 views

Furnace fan operates only when heating is on

I don't have AC unit at my house, and summer heat is really bad when I sleep at night in my bedroom upstairs. Since I don't have AC, I think manually setting the fan "on" while I sleep will ...
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20 views

How to wire in gas boiler zone valves with out a zvc

Does anyone have a basic wiring schematic for wiring up 3 zone valves without a zone valve controller? They are honeywell zone valves. The boiler is brand new and everything is prewired. It just ...
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54 views

How to connect nest thermostat e for American standard heat pump 2005

current wining We have a 2005 heat pump. I tried b wire to nest C wire but it is not working
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77 views

Installing a Honeywell HZ432 for four zone wireless heating

need help with wiring setup. Current setup Gas furnace (heating, no cooling): standard four zone gas furnace setup with hot water circulator 4 zones (3 wired, 1 wireless) Setup: Honeywell THM5320R (...
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19 views

Honeywell T6360 stopped working

When decorating I opened the thermostat cover to unscrew it from the wall. I never touched any wiring, decorated, screwed it back, closed cover, done! Now the thermostat won't work. Any ideas why this ...