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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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Trane comfort 2 thermostat keeps going blank

I have a Trane Comfort 2 thermostat and Trane TAM8A0C48V41CAA AC / heat pump. We were gone on vacation for a week. I wanted to turn the fan from auto to on because the air in the house seemed a ...
Eric's user avatar
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ICP Air Handler C wire location

Can someone help me understand where to attach a C wire to this Air Handler ICP Model: BDHU 331000 . The current wire running from the thermostat to the air handler has 6 wires but only 3 being used. ...
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Replacing old theromost with 6 wires

We have an old thermostat that runs our heating and cooling (a geothermal system). I'd like to replace this thermostat with something more modern but I'm having trouble figuring out what is compatible....
Kulluk007's user avatar
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I want to replace the current 3 yr old Honeywell thermostat,with a newer Honeywell model with remote sensor. Is this a DIY? [closed]

I want to replace the current 3 yr old Honeywell thermostat, with a newer Honeywell model with remote sensor. Is this a DIY?
Autumn's user avatar
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Does Carrier Infinity older model have batteries and what exactly is the “OVERRIDE” sign for and how do I get it off?

My Carrier infinity thermostat was installed in 2011. Seems to work fine since we bought the place but does it have batteries that need to be changed periodically? Also, my thermostat has an “OVERRIDE”...
Holly Reiner's user avatar
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New baseboard heaters with central AC - thermostat wiring help

Apologies for the long post, I’m very new at this and wanted to provide as much detail as possible. After renovations, I’m having an issue getting the baseboard heaters in the living room to work. ...
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Baseboard thermostat and thermal cutoff question

I have five 750 Watt 25-year-old baseboard heaters on a 240 volt circuit controlled by an Ouellet OTL221 single pole mechanical thermostat that recently could not be turned down, and the room (and ...
Duncan's user avatar
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5 votes
2 answers
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Second floor thermostat, battery powered, does absolutely nothing and appears to not be connected to anything

I recently bought a two-level house that has a thermostat on each floor. The second-floor thermostat was not turning on; I removed it from the wall and removed some corroded batteries, cleaned it and ...
leonsbuddydave's user avatar
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AC Unit Delay Start - Is it contactor?

I have my upstairs AC unit acting up recently. Previously the AC unit used to start instantaneously as soon as thermostat sends the cool signal or if we manually change it from off to cool. But lately,...
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proper thermostat

I switch from heat to cool with a switch at the furnace. Have two normal thermostats upstairs for two zones. Last year gas company switched out one with a digital one that had a heat and cool setting ...
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HVAC create a DIY Arduino smart thermostat, AC current no control board

I have a HVAC that seem to have no control board in the ceiling near the AC unit. The thermostat is directly connected to 6 wires that measure 220V AC (see picture). When I looked for the control ...
Ian Gielisse's user avatar
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Evaporator coils in attic air handler froze in summer

This happened for a second time. A pro came after the first round but nothing was found (he said refrigerant level is ok, did not find blocked pipes) . I saw ice over the coils during the second round....
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Need C-wire for new Honeywell RTH6500WF Thermostat

I am upgrading my old non-wifi programmable thermostats with Honeywell wifi models. These need a C-wire and my wiring only has 4 conductors and no C-wire (see image). I contacted Honeywell support and ...
NetGeni59's user avatar
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1 answer
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WiFi Install no C Wire for thermostat or control panel

New home and trying to change old thermostat. New DIYer for electrical and HVAC. No C Wire however it does have 5 wires. RH, RC, Y, W, G. Attached is the schematic on the actual unit. I am unsure how ...
SArc00900's user avatar
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How can a 240V device with a single hot terminal be wired with two 120v hot wires?

US based. I am looking to install this radiant floor themostat: https://www.homedepot.com/p/QuietWarmth-120-Volt-240-Volt-7-Day-Programmable-Floor-Warming-Thermostat-THERMPRO/318528774 The thermostat ...
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Another C-wire for Nest thermostat question

Some background first. 30-ish year old furnace/boiler with a zone system and six zones. This was my parents full-time residence in rural Maine, but after my father passed away in 2022, and my mother ...
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Carrier thermostat upgrade

Looking to upgrade the old Carrier 2 stage thermostat with a new smart Honeywell T9 Smart Thermostat. The Carrier thermostat is a Comfort Zone 2 and has only 4 wires, V+, VG, RS+ ad RS-. Is there a ...
Al78's user avatar
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Nest Power Connector (C Wire) on A/C unit GMP075-4

I’m trying to use a Nest thermostat on my older Goodman GMP075-4 unit. I have a Y, R, W, and G connector for the thermostat. I’ve read through a few number of the other questions related to this on ...
ariagno's user avatar
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1 answer
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Honeywell room thermostat, a mechanical non digital type. Is there a way to re-calibrate this?

I just installed a new Honeywell room thermostat, a mechanical non digital type. However, the calibration isn't right as it's about 2.5 celcius below the actual room temp. Is there a way to re-...
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Furnace blows cold air, shuts off, then blows warm air

When changing the temperature on my thermostat, the blower kicks on and only blows cold air. This drops the temperature about 2-4°. After running for a few minutes, the blower shuts off. About 30 ...
meatlifter's user avatar
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Nest c-wire question about Honeywell c8610u

Where to connect my “c” wire on the boiler side. Weil mclain gas boiler I have this boiler rebuild adapter. Can I connect the c-wire to that somewhere or would it have to connect to the Weil-Mcclain ...
NorthsideJohnny's user avatar
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Wiring for Nest Thermostat No "Auto" fan Hydro-Air

Currently, my thermostat has G, W, Y and R wires. I have central AC Unit outside, Propane Furnace and an Air Handler in the attic. (Hydro-air) is what I was told. I tried to install a Nest Thermostat ...
Mike's user avatar
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1 answer
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Kenmore Dryer flips breaker when High Limit Thermostat replaced

I have a kenmore dryer model number 11066822694, The dryer works but did not heat up, I tested all components, and the High limit thermostat didn't have connectivity. I replace it with one from a kit,...
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Honeywell rth9585wf to control Boiler and AC

I'd like to use a single Honeywell RTH9585WF (Smart Color Thermostat with Wifi) to control an existing radiator system (boiler) and existing Central air AC. Existing wiring: Boiler thermostat (first ...
Internet Tough Guy's user avatar
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2 answers
38 views

Boiler Heat -3 Zones, 1 won't shut down when reaches temperature

I have a tri-level home, 3 zones with 3 individual thermostats. This is a pretty old school system. The home was built in 1969. The mid level seems to run constant, even when the thermostat is turned ...
Debi's user avatar
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2 votes
1 answer
234 views

Thermostat Wire Terminals

I know wiring a thermostat is red to R white to W green to G yellow to Y and blue to C. Today I tried to find the answer to a question I thought of. Red is 24v common is 24v. Why cant you jump from ...
paul krynicki's user avatar
1 vote
1 answer
33 views

Furnace not starting after i added c wire connection

I just got a sensi lite system. My system didn't have c wire but once i connected c wire, the furnace is not even starting even if i set the temp to 90 degrees. Yesterday without. Connection i was ...
Scorpio84's user avatar
2 votes
1 answer
98 views

How do I transition wiring from an Ecobee to an Amazon thermostat?

I recently bought a house and wanted to change my Thermostat. Currently there is an OLD Ecobee WiFi enabled thermostat. It’s so old their system doesn’t support connecting it to the app anymore. I ...
Austin Decker's user avatar
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Fridge thermostat replacement - resealing?

The thermostat on my drinks fridge is on the fritz, and I'd like to replace it. I've found a suitable replacement part; it's a WPF14B-EX. To replace the thermostat, I need to withdraw the probe and ...
Roger Lipscombe's user avatar
1 vote
1 answer
57 views

How can I connect C-wire at 2-wire Boiler side with existing 24v transformer?

Two zones/thermostats each with 3 wire cable running from boiler room. It appears only 2 of the wires are hooked up (Red and White). There is a 3rd unused and not-hooked-up wire that is dark blue, for ...
jflbball's user avatar
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Freezer cycles to very low temp every 24 hours...is this opposite from expected?

We expect periodic freezer warming in the defrost cycle. But my freezer does the opposite. It consistently swings low (-15) then returns to its normal variation around the target (+/- 10). So it works ...
Don Taylor's user avatar
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1 answer
120 views

Connecting Nest thermostat to this power adapter

My question is probably simple for those in the know. I've looked at the manual, and researched and Googled, however I'm still not confident. I tested this and got 24v on the red wire in bottom left ...
user182393's user avatar
1 vote
3 answers
375 views

How can I test the thermostat for an immersion heater?

My nephew has a hot water tank with two immersion heating elements. He states that the bottom heating element no longer works, and says he tested it by swapping over the wiring from the top element (...
bertieb's user avatar
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1 answer
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4-wire to 5-wire thermostat conversion

I'm installing a 5-wire smart thermostat replacing a 4-wire battery powered model. I don't have 24v from the furnace, so I've installed a 24v transformer. My furnace wires go to Green, Yellow, White,...
Bill Schiltz's user avatar
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Where to connect c wire for thermostat to hydrostat 3250-plus

trying to add c wire for nest learning thermostat but there is no connection on the heater. Where can I connect?
Hannah's user avatar
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1 vote
1 answer
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Thermostat wiring( honeywell t6360b

trying to install a new thermostat but I can't get it to work. In the pics you can see the old setup and diagram and the new diagram. From that I understand I should connect brown to 1, blue to 2,and ...
Vas's user avatar
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1 vote
0 answers
60 views

Heat pump running too much

We built a house 3 years ago. It has two heat pumps and the upstairs one runs way more than it used to. The temp is set to 68 and every time we go upstairs to check it it says the temp is 68 but it’s ...
Erin's user avatar
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1 answer
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Where do I connect thermostat C-wire to the Peerless boiler relay panel?

I’m looking to replace my existing thermostats (two zones) with smart thermostats that require a C-wire. The current thermostats do not have the C-wire connected, but the wire is already present in ...
Jim's user avatar
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0 answers
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Need to have smart thermostat wiring explained like I am 5

So, I have finally purchased my first house, and one of the first things I wanted to upgrade is the thermostat. The heater is ancient, and still works, as well as the a/c. Outside of a now utter lack ...
Aaron Gray's user avatar
1 vote
0 answers
273 views

Honeywell T6 Pro Smart Thermostat doesn't hold temperature overnight - thermostat or HVAC issue?

I have a Honeywell T6 Pro smart thermostat that doesn't seem to hold the temperature consistently. For example, I'll set the temp at 72 degrees with a permanent hold, and I'll wake up in the morning ...
stackhouseflapcakes's user avatar
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0 answers
46 views

New Honeywell thermostat doesn't work

I'm a newbie, and I have a question. My old thermostat is broken, and the fan keeps running and cannot be turned off, but everything else is fine. So, I replaced it with a new Honeywell RTH8800WF ...
Daniel's user avatar
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1 vote
1 answer
1k views

Installing a thermostat with 3 wires only (red/R, white/W, and black/G)

I want to connect an Ecobee to my house, under the constraints imposed at the thermostat (pictured below); you will immediately note that there is no yellow/Y wire (because there is no air-...
Nima Talebi's user avatar
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1 answer
70 views

Is there any chance of a problem using C terminal on furnace to wire a new smart thermostat?

Bought a house built in 1995 with I believe original Ruud Silhouette II gas furnace, central A/C, and a Maple Chase 9600 thermostat powered by two AA batteries. Upgrading to an Ecobee smart ...
user1441998's user avatar
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2 answers
110 views

Is the "C" wire here tied to ground?

Looking at this diagram, it looks like the "C" wire for a thermostat, marked as "COM" on some intermediate component my garage heater, is actually also tied to the ground of the ...
pioto's user avatar
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2 votes
1 answer
89 views

Am I able to use the G and C wires as ventilation contacts for the Honeywell VNT5150E1000?

I am installing the Honeywell VNT5150E1000 ERV. Here is the information sheet: https://s3.amazonaws.com/s3.supplyhouse.com/product_files/Honeywell-VNT5150E1000-Submittal-Sheet.pdf Going from the ...
Andy Hall's user avatar
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0 answers
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Cold air until I unplug and replug in the thermostat

Why is My Honeywell thermostat reading the temperature as lower than the set temperature and blowing cold air until I unplug it and replug it in. Then it blows warm air? This has happened a few times. ...
Erin's user avatar
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1 vote
0 answers
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Can I wire new CT410A Thermostat, based on the original Tstat(90s Nortron) wiring?

ORIGINAL THERMOSTAT; Single pole 90s NORTRON connected to baseboard heater,which has no fan. WIRING- Red wire (connected to single black wire in electrical box) was screwed into Tstat connection ...
Nigel's user avatar
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2 votes
1 answer
129 views

Where do I attach C-Wire in this Rheem RBHA-24J11NUBAI system

I'm installing an ecobee lite thermostat to this system and the c (blue) wire was hidden inside the wall, tracing the c wire inside the air handler I see that is not connected. I have tried connecting ...
Damian H's user avatar
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0 answers
59 views

Amazon thermostat setup with heat pump (w/e and Rc jumper questions)

So I'm in process on installing my Amazon thermostat, which had seemed straightforward until, while hooking up the O/B wiring, I noticed the little warning tag on the new tstat saying not to hook up ...
Monkeybizness707's user avatar
4 votes
2 answers
545 views

Is there a way to run my furnace fan intermittently without heating the house more? [closed]

We just moved into our first house in September and it's old but surprisingly well insulated. We don't like it overly warm either so in the winter the thermostat is often set to 18°C/64.4°f The ...
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