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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38 views

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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37 views

Can I have independent heating zones with a standard boiler?

We have a new standard gas boiler in our home along with two thermostats, one for the basement and one for the rest of the house (living room, bedrooms, etc). The problem we're having is that the ...
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2answers
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Thermostat for heating and cooling

I have oil fired baseboard heating and a separate AC system. Currently I have two older thermostats installed. I'd like to replace with a single unit, however I can't locate any thermostat that ...
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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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1answer
34 views

Thermostat wire type

I need to replace the wire from my thermostat from the oil burner in the basement to the second floor. I suspect a mouse chewed the wire or some other reason for a break in the wall along the way. ...
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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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1answer
15 views

How to hook up a WiFi thermostat. Having 5 wires and no C wire

I have 2 wires coming up from my basement oil fired furnace and 3 wires coming from my central air handler in attic I am trying to hook up a Honeywell WiFi thermostat. The 2 wires from the basement I ...
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1answer
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TriangleTube Smart 30 digital thermostat

I have a TriangleTube Smart 30 indirect water heater which unfortunately only comes with an analog (red top blue dial) thermostat. I would really love to find a way to get a digital thermostat on it ...
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3answers
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Tekmar 532 gives error code about voltage too low. Hooked up to 24v powersupply, fluke multi-meter reads 24.18v across wire

I have a tekmar 532 which I have hooked up to a Signcomplex 24V 2A 48W Power Supply Adapter Transformers 24VDC LED Driver Switching Power Supply for LED Strip Light AC/DC Power Adaptor, UL Listed. ...
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3answers
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Wiring a Double Pole Thermostat to Replace a Single Pole 240 Thermostat

I am attempting to wire a new double pole four wire 240 volt thermostat to replace the single pole thermostat that is pictured. Coming into the junction box on the right are two Komax lines. On the ...
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1answer
55 views

I accidentally short the c wire and both units not turning back on

I was trying to installed my nest thermostats.the power were shut off but it seem some current still in, so it short the system my question I can't located the fuse on the board so is that mean the ...
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Looking for the right thermostat- is it this hard

I want to do something that sounds really simple but cannot get a solid answer. I'm looking to set it and forget it. SW Pennsylvania sometimes one needs heat and cool the same day. I have a dog living ...
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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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60 views

I have seven 24v 2amp thermostats. Do I just need a single 24v 2amp power supply to power them?

I have seven 24v 2amp thermostats. The thermostat wires all feed to the same place. Do I just need a single 24v 2amp power supply to power them? The thermostats are Tekmar 532. They will connect to a ...
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1answer
42 views

Trying to add a 'C' wire to my thermostat

I recently got a smart thermostat that requires a 'C' wire. My existing thermostat had only W1, W2, R, G. After removing the faceplate, I noticed there was what looked to be an unused yellow wire in ...
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How To Run Thermostat Cable Without Going Crazy?

I've read a hundred questions on this, and most of the answers come down to solutions I've tried that don't work, hiring an electrician, or doing some very messy work. I'm hoping there's some way to ...
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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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1answer
70 views

How to wire a smart thermostat with dual Transformer system? R , Rc, W , Y , G. No C wire. No Jumper

Is this system considered a Dual Transformer system? According to Nest since there is a R and RC cable it must be a dual transformer. But they were unsure and I don't know what that means! I don't ...
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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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Connecting fresh-air damper to Lennox furnace OR replacing timer with new smart thermostat

We replaced a 20-year-old furnace with a new Lennox furnace and added air conditioning. The new system is still controlled by the 20-year-old Honeywell Chronotherm III thermostat. The furnace had (and ...
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2answers
21 views

2 pole thermostat to 3 wires from wall

I have a 2-pole thermostat that I want to install to replace the old mercury thermostat. From the wall there is a green, white, and red wire. The thermostat has 2 black and two red. If you cannot ...
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1answer
52 views

Can I hook up a smart thermostat to a “high efficiency gas forced air heater”? Are there any caveats?

I got some help from folks here identifying this as a gas unit heater. I'm wondering if it's safe to replace the thermostat with a smart thermostat, and if there are any caveats, E.G. minimum on and ...
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1answer
34 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

Will a double pole, 240V thermostat work here and here? Wiring for 1.5v old brain

Facts: Existing heater circuit, 30 amps, 240V has two WALL HEATERS AND two thermostats in two different rooms. (For the furnace-focused, milliamp minds, you can move on to another question). ;) ...
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1answer
55 views

Furnace turns off before temperature is reached, fixed by unplugging and replugging thermostat

As the title suggests, my furnace will sometimes shut off as if it's reached the target temperature, while it is still far below (ex. set to 70F, stops at 63). If I unplug the thermostat, the furnace ...
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1answer
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White Rogers 9600 Thermostat-Set at 70 Deg,dropped to 62 deg-no heat-Trane XR90 gas furnace

I checked the batteries on my White Rogers-9600 thermostat,which were fine.(earlier in the day-furnace ran fine) At 12pm the thermostat dropped to 62 degrees with no heat. After kicking up the heat to ...
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35 views

Taco zone controller - blinking yellow light?

I have a Taco ZVC406 zone controller. This is the type which takes signals from multiple thermostats and uses relays to switch on the heating loop pump. I am using a Honeywell CT87K thermostat on one ...
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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
35 views

Why does one Mysa smart thermostat override the others?

I installed a Mysa smart thermostat in our master bedroom to control our baseboard heater. There are three other analog thermostats on the same floor (bedroom, office, bathroom). Today we noticed that,...
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1answer
45 views

Run humidifier while furnace is not heating but fan is running?

I've got a bypass humidifier mounted on my gas furnace, and an ecobee 3 thermostat driving both furnace and humidifier. What I like about having the ecobee drive the humidifier, is that it knows the ...
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1answer
64 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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Thermostat T694B replacing with Honeywell SuitePRO TB6575A1000

I am replacing a Thermostat T694B with a Honeywell SuitePRO TB6575A1000 in an apartment building with switchover heating/cooling, so presumably two-pipe system. Button-wiring mapping: Lo: 1 Med: 2 ...
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2answers
50 views

SunTouch underfloor heater without floor sensor?

I have purchased two SunTouch UnderFloor 16" x 6' long 120V 0.6A to retrofit a radiant floor on the one-level-above bathroom without having to remove the floor. The instruction manual (page 4) ...
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Replacing my Honeywell thermostat with a Nest heatlink in the UK

Can someone help with this. Trying to pick the C wire and the NO wire from here. Please note I am in the UK [![enter image description here][1]][1] [1]: https://i.stack.imgur.com/EPkJh.jpg![enter ...
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1answer
35 views

Ceiling heat not working right

The ceiling heat in one of my rooms will not come on unless i turn the thermostat up. Once i do that, the heat will not shut off unless i manually turn the thermostat way down. The thermostat clicks ...
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1answer
24 views

Replacing old Electric Radiator Thermostat (220v) with a 4-wire Honeywell CT410B (Non-Programable)

When removing and tagging the wires from the box to the old Thermostat, the two Neutral (White) were wired together with a wire nut, and a single White wire (pigged-tailed) was going into the ...
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3answers
58 views

How to control 120V power outlet with low voltage

I would like to power a 120V attic fan every time my AC comes on. The low voltage wire connecting the thermostat with the compressor (to control the compressor) runs through the attic (as the ...
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1answer
28 views

C wire for smart thermostat

I’m trying to add a smart thermostat and it seems I can’t find a C wire. I need to know where to tap in if I need to. It looks like I have extra wires on my thermostat wire going into the house.
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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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48 views

Web-based remote access of my Carrier Infinity thermostat and Flash end-of-life

I have a Carrier Infinity system, installed some 3 years ago. I was able to access the thermostat over the internet until very recently, because the web access feature uses the Adobe Flash Player ...
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2answers
36 views

Problem controlling propane free-standing stove with a millivolt thermostat

Heat only millivolt non-programmable thermostat stops turning propane stove on after 20 years. Stove turns on/off just fine using manual switch in back of stove. So I assume thermostat bad and replace ...
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34 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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Can I wire R from AC system and R from heating system to single R terminal on thermostat?

I want to replace existing thermostat that controls both heat and AC. There are two cables coming out of the wall. One goes to heating system with a red wire and a white wire, the other goes to to the ...
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1answer
38 views

Can't get furnace to run in FAN ONLY mode

I can't figure out why my furnace is not working in FAN ONLY mode. It works fine when calling for heat, but when Fan is set to ON and there is no call for heat (or heat is turned off) the fan does not ...
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1answer
37 views

2 blue wires on furnace

Today I was trying to put in my smart thermostat and have had no luck. My old thermostat (pictured below) did not have a C wire connected but did have the wire behind the old thermostat. After the ...
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3answers
46 views

Letting a thermostat regulate temperature, or do it myself? [closed]

I always hear people say that it is more efficient to let a thermostat regulate the room temperature. Well, I do not have a thermostat, but I have an electric heater with on internal one. Not a exact ...
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1answer
43 views

Electric heat does not turn off when desired temperature reached

My electric heat (baseboards) do not turn off when the room reaches the desired temperature. It does turn off, however, when the thermostat setting itself switches (automatically if there's a schedule ...
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43 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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1answer
29 views

Looking to modify behavior of aux heaters

In my condo I have a heat pump with electric strips for auxiliary heat. When the outdoor temperature is quite cold, the heat never turns off. It reaches the set temperature, but keeps running. When ...

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