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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Air conditioner circuit breaker keeps tripping after new thermostat installation [closed]
Prior to installing the new thermostat, both the heating and a/c breakers were engaged and systems were operational. I turned off both breakers before installing the new thermostat. When I completed ...
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AC constantly running and overcooling my house
My AC just will not stop running. The temperature outside has been fluctuating from super cold to around 70 degrees, so we’ve been setting it to 73 with the cool air on. The problem is, when we wake ...
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2 thermostats daisy chained on 12g wire
I currently Have one Honeywell programmable thermostat, two wire hooked up to two baseboard heaters that are 240 V. The thermostat controlling these two baseboard heaters equals 3500 W max now what I ...
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Replacing two adjacent thermostats with one
My home has two adjacent thermostats, each one controls a single 1000W 240V baseboard heater. The heaters themselves are on opposite walls of the dining room. I’d like to replace both thermostats with ...
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Whole house humidifier not operating
I have a two part question focused to get my Aprilaire 560 humidifier operating.
First, I've deduced that the solenoid valve is not getting power. During furnace operation (carrier heat pump and gas ...
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Do I need a junction box for thermostat wire splices?
I have an oil fired heating system with 4 zones heated with baseboards. I recently noticed that one of the zones stopped working because its thermostat wire in the basement was frayed. I removed that ...
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Identifying a bimetal thermostat from an electrical wall heater
Attached are pictures of a bimetal(?) thermostat from an electric heater. The knob broke off, so I need to replace it. Does anyone know the name? Or have a link?
https://imgur.com/a/qhaC7Mo
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Will this thermostat work for my wiring?
Here is the wiring from the existing thermostat:
The new thermostat is a Wyze.
Will this Wyze work with the existing wires? Any help here on how?
If this unit won't work for me, what keywords can I ...
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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 ...
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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 ...
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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, ...
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Why can't my Trane/Honeywell thermostat be replaced with a Google Nest non learning thermostat? [closed]
The wiring for my thermostat looks like below. This is a Trane (Honeywell ?) TCONT602AF22MA
Terminal designations as per their manual
Here is the result after answering their questions.
I want to ...
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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 ...
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System has Orange, Blue and White wires.. but thermostat does not have a place for each!
Trying to update 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 (terminal / wire)...
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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 ...
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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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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 ...
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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 (...
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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 ...
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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 ...
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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, ...
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Two-circuit thermostat tripping at different spots on the dial
I have a two circuit thermostat running two baseboard heaters. One circuit trips at a much earlier spot on the dial than the other, so the second heater never turns on. (One trips at roughly 8 o'clock,...
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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 ...
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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 ...
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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?
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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 ...
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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?
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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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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 ...
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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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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 ...
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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 ...
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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) ...
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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 ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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