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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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Furnace 3amp fuse blows when smart thermostat placed in base plate

I am trying to switch from a Honeywell thermostat to a Ecobee smart thermostat. I have a high efficiency York furnace only system. No A/C or humidifier. System is less than 10 years old and functions ...
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How to install Ecobee thermostat to central heat pump (two wires) [duplicate]

I am trying to install an Ecobee Enhanced thermostat to my central heat pump which I am told has 1 stage of heating, cooling, and aux heat and has an inverter which ramps up and down. However, the ...
Zach's user avatar
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2 answers
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Nest thermostat and no C wire at my boiler

so I bought a nest thermostat and it keeps running through the AAA batteries, recommending that I use a C wire, though there's just 2 coming out of the wall (red and white). I got C wire/power adapter ...
Brian Battenfeld's user avatar
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106 views

Thermostat Wiring for Zoned Hydronic Heating

I have a 7 zone circulator pump heated using Navien combi-boiler. 3 thermostats are connected to the boiler, and the remaining 4 are connected to a Taco SR-504 relay. All the connections have 2 wires, ...
Steve's user avatar
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Boiler heats up water, but radiators are not working

The boiler should be working correctly, the hot water works and engineer came two weeks ago to check everything and it’s fine. However the radiators do not heat up. It was working correctly, then I ...
Wiertara's user avatar
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2 answers
538 views

System has orange, blue and white wires but thermostat does not have a place for each

I am trying to update my thermostat so we can set BOTH heat and cool temps. Right now, we get to play the 'go change to heat/cool' game based on what the weather is doing.. OLD thermostat has (...
revive's user avatar
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2 votes
1 answer
106 views

Thermostat relocation

My thermostat is close to the front door. My furnace kicks in every 10 minutes, even when I keep it at 65 F. I was told something exists that would work in place of the thermostat and read the ...
Michelle's user avatar
1 vote
2 answers
68 views

Trying to replace old thermostat

I'm replacing my folks old thermostat.I'm trying to make sure I have all the information before proceeding. There are 3 wires but only 2 are connected. The 3rd wire is just bent around the opening. So ...
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4 votes
1 answer
538 views

New Thermostat displaying inaccurate for outdoor temperature sensor

I installed a new Honeywell TH8321WF1001 thermostat to replace a Carrier programmable thermostat. This is a dual fuel Carrier system (heat pump with gas backup). The new HW stat is working fine ...
Patrick's user avatar
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1 answer
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Replace under floor heating thermostat

Trying to replace a Heatmiser Neo Stat Slimline V3 with a Meross MTS200. This the configuration for the existing thermostat: The Meross unit has an extra connector, not sure what to do with it (...
Cheetah's user avatar
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Where to "splice in" 24v C wire with no control board for new smart thermostat

Hoping someone out there is smarter than me. Recently got the amazon smart thermostat and it requires a C wire. Old thermostat did not. I do have an unused wire from the air handler to the ...
Nicholas's user avatar
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1 answer
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Trane XR95 No power (2 volts) to Thermostat

Trane XR95 ~2.2V at Thermostat Woke up this morning to a cold house and a thermostat message saying “no power to the Red wire.” Measured R and C using a multimeter and it reads ~2.2 Volts. Took the ...
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Whirlpool Electic Oven AKP 458/NB heating elements not shutting off on desired temperature

The problem began when I was baking some cookies. I was keeping an eye on them when suddenly I noticed they were starting to burn. The top and bottom elements decided to just stay on. I am glad I ...
Bad Sector's user avatar
1 vote
1 answer
526 views

How to wire ecobee thermostat to central heat pump (two wires only)

I apologize in advance if this is not the correct forum for this. If so, please let me know where I should start. I am looking to have my central heat pump set up with Ecobee Enhanced. For background, ...
Zach's user avatar
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2 votes
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200 views

How should I reconnect my 240v baseboard heater/thermostat wiring?

Everything was working fine, then I tried to install the Mysa baseboard heater v2 thermostats. When I realized that my wiring doesn't seem to support them, I put everything back together, and now of ...
jon's user avatar
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1 answer
128 views

How do I automatically run a fan whenever my freestanding gas fireplace is running?

Under the 2020 NEC, I'm looking to add an extra fan to a freestanding gas fireplace beyond the built in blower. The extra fan is an ordinary wall fan with a 15A/120V plug. The existing blower uses a ...
popham's user avatar
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Is there a limit to how far/long you can run thermostat wire before it loses it's ability to work?

I'm hoping to move my Google thermostat to another location in the same room. The wire will be forty feet long, approximately. Is there a limit?
Adrien's user avatar
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1 answer
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What smart thermostats is compatible with live wire Fan coil system

I had an old fan-coil system in the unit. It has 3 fan speed controls and heat/cool/standby. I am contacting the management for the exact model and specs but since it is really old, no one seems to ...
punpun_G's user avatar
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2 answers
58 views

Do they make a 120 volt programmable thermostat? [closed]

I have an oil burner with hot water baseboard heat. My thermostat is 120 volts. Do they make a programmable thermostat for my system?
Bob's user avatar
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1 answer
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Cadet 4 wire thermostat to multiple heaters diagram help?

I am in need of some help hooking up a couple cadet four wire thermostats to multiple heaters in different rooms The thermostat on the back has two red wires and two black wires L1 L2 T1 T2 I believe ...
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1 vote
1 answer
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Should I upgrade my boiler control transformer?

I have a 24V 40VA transformer for my boiler. It powers two zone valves labelled 0.9A each, and two thermostats labelled 1VA each. All of them together would draw about 45VA. I'm now adding an ...
jay613's user avatar
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1 vote
1 answer
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How do I handle two wires on W2 terminal block of old thermostat when moving to new thermostat?

I have an old thermostat that I'm ready to replace. The old thermostat has A/C, Heat pump with 1 stage auxiliary (electric forced air) heat. I am replacing the old one with a Honeywell RTH6360D. I'm ...
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2 answers
547 views

Installing 4 baseboard heaters on a 20A double pole circuit

I am looking for some help with configurations on installing 4 baseboard heaters on a 20 amp double pole breaker with 12/2 wires. My current set up is all four baseboard heaters are hooked up to one ...
Bryan's user avatar
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17 views

Why does my indoor blower shut down 5 min after when I turn to heat mode?

I have a Tempstar Heat pump system and starting this year I went to heat mode. Heat pump comes on along with the indoor blower. 5 min later the indoor blower will turn off but heat pump remains ...
Cole's user avatar
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1 vote
1 answer
95 views

Heat pump, when it's not very cold, don't want to use auxiliary heat, is this controlled by thermostat?

We have a heat pump with electric furnace as the auxiliary heat source. It's not extremely cold yet and the heat pump can get us to the correct temperature (without implementing auxiliary heat source) ...
raddevus's user avatar
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1 vote
0 answers
347 views

Mysa thermostat(s) and 2 baseboard heaters

I'm having some problems hooking up my baseboard heaters (1500w) to Mysa thermostats. They are both on the same breaker. Currently they are operated by 2 thermostats that are on the same separating ...
cctotti's user avatar
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1 answer
157 views

How can I hide this low voltage wire for my Nest thermostat?

Our HVAC is too old for a C-wire or C-wire adapter. I installed this to keep power to the thermostat. Would it be up to code if I put a recessed wall outlet in and then ran the wire behind the wall ...
Josh's user avatar
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2 votes
0 answers
66 views

Advice on use of Boiler Reset Device in 2023

Question: I'm looking for wisdom, tips and tricks regarding installation of a "boiler reset", a device that reduces water temperature in a central heating system on moderately cold days. ...
jay613's user avatar
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2 answers
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Can I install a 24V tranformer inside of the wall cavity?

I have a question similar, but not identical to this one: Transformer location Can I install a 24V transformer inside of interior wall cavities, with no access other than removing drywall? My house is ...
Cheery's user avatar
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1 vote
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35 views

Installing c-wire adapter on hvac

I'm installing an Amazon smart thermostat. The hvac control board has 3 of the wires that the instructions state to disconnect and connect to the adapter (G, W, Y). But it's missing R, and Y has two ...
Ctakacs9's user avatar
2 votes
1 answer
255 views

Where to connect a common wire to a Burnham alpine Furnace

Like many on this site I am trying to install a smart thermostat. I have 3 wires, 24V Red, white, and blue at the thermostat, but only 2 down at the boiler. My boiler is a Burnham Alpine model number ...
Paul's user avatar
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0 votes
1 answer
83 views

Why would Honeywell 9000 WiFi thermostat lose power on new install?

Replaced a carrier 3ton with Heil 2 1/2 ton 96% eff. Installed new Honeywell 9000 WiFi thermostat. The tstat loses power when burners turn off. Then cycles back on. The ac works fine w the tstat. Also ...
Jenn's user avatar
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0 votes
0 answers
37 views

Where does my C Wire go?

Changing thermostat and need to connect c wire at furnace. I connected to the brown bundle based on the wiring diagram and it worked to get power to the new thermostat. However, only the the fan runs ...
Morgan's user avatar
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0 votes
1 answer
102 views

Wrong Wiring for a Condo Thermostat?

Hi there. Friend's condo has heat mode turned on by building management but when she turns on heat its just blasting cold air even at 24 degrees celsius. She's wondering if the wiring is wrong. She ...
AJT's user avatar
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1 vote
1 answer
402 views

Install Honeywell RLV4305A in box with 6 wires

I am trying to install the referenced thermostat for my baseboard heat in one room. I did follow along this post 2 wires, both hot, for 240v baseboard thermostat After color coding my wires that post ...
user111700's user avatar
1 vote
0 answers
142 views

Y wire question: Help to connect smart thermostat with C wire adaptor

Trying to install an amazon smart thermostat with a c wire adaptor. On the thermostat end, pretty straight forward. Rh, W, Y, G wires. Noted that a blue colored wire is Y wire. SEE PICTURE When I went ...
George's user avatar
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5 votes
3 answers
1k views

Heating and Cooling controlled via one thermostat

I currently have two thermostats. 1 for heating and 1 for cooling. The heating one stopped working recently and now that winter is coming, I am interested to combine them into one. Here is what I have ...
OldLynx6348's user avatar
-1 votes
1 answer
91 views

Why did my water stop getting hot and my stove doesn't do anything

Cold water coming from the hot water heater. Changed the bottom heating elament that was bad and let the tank refill. Turned power back on and waited an hour, turned the water on to see if it was ...
Please help's user avatar
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0 answers
48 views

2 stage heat pump and condensing boiler run off one 3rd gen thermostat

I have a 2 stage 20 seer bosch heat pump utilizing aux heat strip for second stage. I also have a navien condensing combi unit for domestic and hot water baseboard heating. Currently both systems are ...
Brian's user avatar
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0 votes
1 answer
218 views

Refrigerator short cycling because of thermostat? and which one?

This samsung unit has been running smoothly for a few year. Suddenly it caused a short and the short/ground breaker went down. Trying a test - plugging it in without the ground pin - the fridge turns ...
Adeerlike's user avatar
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0 answers
246 views

Replacing Honeywell Thermostat (UK)

Hiiii, I'm in the UK and trying to replace an old battered thermostat. I have a Honeywell ST6100A and I'm looking to update to a Honeywell ST9400C. I somewhat naively thought that because it was the ...
Mike's user avatar
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3 votes
4 answers
2k views

Natural gas fireplace with included "smart" thermostat and DIY added "dumb" thermostat as a power outage failsafe [closed]

I'm seeking a fireplace that can have two thermostats installed in parallel, a "smart" thermostat that requires power and a "dumb" mechanical thermostat that allows the fireplace ...
MacGuffin's user avatar
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-1 votes
1 answer
99 views

Restoring automatic selection of natural gas heat vs. heat pump based on outdoor temperature [closed]

I had a Goodman SSZ14 series heat pump installed in 2008, with the installation came a then top-o-the-line Honeywell thermostat which provided the feature to select heating source (heat pump or ...
MacGuffin's user avatar
  • 393
0 votes
2 answers
111 views

Do I have a wire to repurpose as a C-wire?

Do I have a wire to repurpose as a C-wire??
Tracy Evans's user avatar
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0 answers
155 views

What are these fireplace features and parts called?

I had my old fireplace damaged in a storm which resulted in its hasty removal and an ugly patch to cover the hole. I've been shopping for a replacement off and on since but it seems I'm running into ...
MacGuffin's user avatar
  • 393
-1 votes
1 answer
44 views

Where to add C-Wire connection for thermostat

I’d like to ask a follow up question on this thread below. How can I add a "C" common wire to this system? This was the fix: In the wiring diagram in the PDF you linked, the BR (brown) wire ...
user172250's user avatar
1 vote
3 answers
737 views

How cold can it get outdoors before air source heat pump sees damage from running? [closed]

I'll start with some background to set the scene for my question. About 15 years ago I got a heat pump and natural gas furnace to replace the air conditioner and natural gas furnace that had broken ...
MacGuffin's user avatar
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1 vote
0 answers
37 views

Thermostat relay access

After nearly 30 years in my 1950s-era home, I'm finally getting around to finishing the basement. I'd like to put up a drywall ceiling, but this device, which I believe is the thermostat relay (to a ...
kellymac's user avatar
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0 answers
164 views

How do you bypass the EIM on a Carrier unit?

I am in need of help installing Ecobee Premium on an existing Carrier unit. How do you bypass the EIM? Not sure what wires to use.
Jenn's user avatar
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1 vote
2 answers
137 views

How to make c-wire to a new boiler using Fast-Stat common maker?

I'm seeking assistance regarding connecting a C-wire (for Ecobee) to a new boiler using the Fast-Stat common maker. The new boiler currently has two thermostat wires available for connection. However, ...
Kamsu's user avatar
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