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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16 views

Replacing thermostat and metal plate inside wall cutout

I am replacing my Honeywell thermostat. I removed the old one and there is a metal plate inside the drywall cutout that the old one was screwed to. I need to remove the plate because the screw holes ...
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67 views

Nest Thermostat E wiring with a C-wire adapter

I wanted to get a Nest Thermostat E, but my current thermostat doesn't have a C wire. From what I read online, it's better to use a C wire, so I was considering adding a Venstar Acc0410 adapter. ...
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Tried switching old thermostat with digital one…wasn't working, so switched it back to old one and ir is still not working

I decided to upgrade the old thermostat control for heating/cooling, to a simple non-programmable digital unit. I simply attached the wires to the corresponding terminals in the new unit. After ...
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24 views

Adding c wire to Goodman model GMT070-3B gas

this is a photo of the old board I took out a while back. New one is the same. I'm trying to add a c wire and don't know where to put it on the board. Can anyone help me?
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Thermostat Unit Pops Out When Trying to Close

My father has a radiator in his house that is missing a Thermostat Unit (the plastic thing that screws on top of the valve - not really sure what it's called). I managed to screw on a unit from ...
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94 views

Using a second thermostat as a remote temp sensor

I’m using Honeywell WiFi enabled thermostats to control heating and cooling at home and cottage. I would like to add another thermostat of the same type simply so that I can remotely read the ...
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139 views

Connecting thermostat common wire to air handler or boiler?

we are planning to install a Nest learning thermostat in our house. On first installation attempt the device notified us that there was no power from the Rh or Rc wires which from my understanding is ...
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PTAC heat troubleshooting

I own a condo with two Islandaire EZ09EBMXH8N10AA PTACs, one of which is acting weird. They have self-contained A/C mechanisms, but the rooms are heated by pumping hot water from the building through ...
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84 views

How to add a C wire to an old Lennox attic furnace GS810-105N

I bought a smart thermostat for my house in hopes of cutting some bills a little. I read up on them, I thought, thoroughly and figured I could handle the task. However, upon climbing up in the attic ...
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32 views

Can I hook up the Glas WiFi Thermostat with oil furnace in basement and central ac in attic

I have an oil furnace in my basement with only 3 wires for the thermostat only 2 being used. I just installed central air in my house but air handler is in the attic with 5 wires for the thermostat 4 ...
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Pretty basic Honeywell Wireless Thermostat Questions

I thought I knew at least the basics of how the Honeywell Thermostat worked, but testing with a multi-meter dashed those presumptions. I have another question posted, but until I get the basics ...
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Honeywell TH6320R1004 Wireless Thermostat with Two Transformers

I have a Honeywell TH6320R1004 and am trying to set it up to work with a second transformer (just added a Taco ZVC403 to an existing Taco SR503). The second transformer was needed to power the zone ...
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How to wire my new thermostat from old boiler switch

I bought a new thermostat hoping to replace a simple on/off switch for my boiler. I've never done this before and am confused about how I should arrange the wiring on the thermostat board. This is ...
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3k views

How do I turn off the programs on my White Rodgers thermostat?

I can't find anything on the internet about this issue. Sites like this: https://www.hunker.com/12279552/how-to-program-a-white-rogers-thermostat explain how to set up a program but they don't explain ...
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109 views

Where do I connect C-wire to Burnham boiler?

I'm adding a smart thermostat to one zone of a two wire, oil fired boiler system. I've roughed in a new wire and could use some help determining where to terminate it at the boiler. The wiring is far ...
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New thermostat turns fan off when set to on, never turns off on auto

My oil heat furnace was functioning normally on an old mercury switch thermostat, but I wanted to replace it with a programmable Honeywell 5+2 one. There were Y, W, G, R, and B wires screwed in on the ...
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724 views

How do you install a thermostat if you don't have Y or C wires?

My thermostat is a LuxPro LUX PSP511LCa. I looked behind the thermostat and I see the following: A red wire connected to RC A jumper connecting RH and RC A white wire connected to W A green wire ...
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I live in a multi unit home and we have two heat meters but only one thermostat. What is needed to get a 2nd thermostat?

The basement and top two floors are on one bill and the first floor is on another bill. What is needed to get the first floor its own thermostat?
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311 views

How to connect 2 thermostats and baseboard heaters on one breaker?

I have already run the wire from the electrical box ( not connected) to the thermostats and heaters (not connected) now I need to know which wire is to be connected in order. It’s 12/2 gauge red and ...
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124 views

Adding a C wire and fixing White vs Red on my Furnace

TLDR: I think I need to flip R and W wires, and to splice the blue (C) wire to the brown wire coming of the transformer. Is this correct? Long version: Like many others on here, I'm trying to add a ...
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132 views

Honeywell T6 PRO Z-Wave Thermostat (model th6320zw2003) exhibits very erratic behavior after battery replacement

Background: My apartment complex installed Honeywell model th6320zw2003 thermostats in all units about six months or so ago, and it had been working well for all that time. The only issue was that ...
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I am installing a Honeywell Pro 2000

So, I have the green, white, blue and red wires coming in, but DO NOT have a yellow. There is a brown. I do have both regular gas heat, and AC. What terminal should the brown wire go? And should the ...
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75 views

April Aire 600 powers off while furnace is firing

After having a new furnace and AC installed in the summer of 2018, replacing my 20-year old equipment, the existing AprilAire 600 whole-house humidifier behaves differently than before. During the ...
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49 views

Secondary C Terminal on Furnace Circuit Board?

I was trying to install an Ecobee thermostat, and there was no C wire installed. When I went to install the power extender kit, I saw the standard C wire terminal was broken out of the black plastic ...
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Enable “early start learning mode” on my hot water heater system thermostat?

Last year our old thermostat died and we got a new one. This is not a smart wi-fi connected thermostat, but it has an "early start learning mode" setting which isn't enabled by default. Last winter I ...
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244 views

Installing double-pole line voltage thermostat for 2 baseboard heaters

I'm trying to replace an old manual thermostat with a new digital thermostat for my line voltage baseboard heaters. If it's important, this particular thermostat simultaneously controls two separate ...
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1answer
43 views

Honeywell aquastat L8124L install

I am planning to replace the erratic aquastat in an oil-fired furnace. I was able to get the exact replacement model-L8124L. Does it require shutting off water to the tank and priming after the ...
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41 views

In the majority of UK-based traditional boiler setups, what does the hot water thermostat look like?

I realise that this may be an impossible question, but I was wondering if somebody would be able to help. For the majority of traditional boiler setups in the UK where hot water is stored in a tank, ...
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1answer
215 views

Old electric baseboard heater thermostat wiring

I have a question about an old federal pacific baseboard heater thermostat's wiring. I disconnected this thermostat 2 weeks ago, thinking that we were going to remove the heater. Now we've decided to ...
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1answer
38 views

multiple thermostat boiler connection

I have a boiler system with thermostats and valves for three floors. before i changed the boiler what ever thermostat called for heat worked for that floor. Now all thermostats have to be on or ...
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62 views

Replacing old thermostat and two unidentified wires

I'm replacing an old thermostat from the early 90's with a new wifi thermostat. When removing the old one, it only used R,G,Y,W wires, and the new wifi thermostat requires a C. After fully removing ...
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316 views

Only getting 15-16 volts from Furnace R and C

I recently purchased a smart thermostat. Because it needed a common wire and I only had a 3 wire setup, I ran a new thermostat wire to my furnace. However, I now get only 15 volts (inconsistently, ...
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132 views

Replace thermostat wiring from my Carrier Weathermaker 8000 to my Nest thermostat

I'd like to replace the wiring from my Carrier Weathermaker 8000 to my thermostat to add a C wire. I assume I need to turn off the Carrier first, but there is no power switch that I can see on the ...
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199 views

Where does my C wire go in this splice connection?

I'm looking to install the Ecobee3 Lite thermostat. My current thermostat has a blue C wire running to it, so my understanding is the PEK doesn't help because that is used if you have no C wire. On ...
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62 views

Is the PY4G HVAC unit compatible with Nest Thermostat?

I recently bought a Nest Thermostat and I've had nothing but trouble with it. The main symptom is the fan and the AC compressor won't run at the same time. Power only comes through the green wire, not ...
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394 views

How to hardwire combined HVAC system for cooling?

I had to borrow the Nest thermostat from one of my units for another one where it was more needed, while a replacement is on the way. The unit from which I borrowed is combined HVAC (heat+cool) with ...
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119 views

Why does my thermostat show code 'PF' after running the fan or A/C?

After running either just the central HVAC fan, or the central HVAC AC for just a few minutes, the Bryant thermostat (Model TSTATBBPB101, C Wire attached) screen momentarily shows "PF", and then goes ...
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75 views

Thermostat settings two hvac units older house

So I purchased a historic house built in 1920. The house has two HVAC units, one for the upper floor, one for the lower. Total sq ft 3300. I had been setting the upstairs thermostat at about 83 ...
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263 views

Condo fan coil thermostat fan never turns off, cooling is humid

My thermostat in my condo is a honeywell thermostat and it the only options it has are System and Fan. Fan is set to auto (other option is Lo Med Hi) and the System is set to Cool (or Auto or Off). ...
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65 views

Ecobee installation with two Rh wires, occupied G wire and HRV

I just moved to North America from Europe (hence why furnaces, HRV systems etc are totally alien to me) and I'm having trouble understanding how to wire up an ecobee3 lite to replace my Honeywell ...
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981 views

Carrier Furnace (6-wire) to Honeywell thermostat --> no cooling :-(

Carrier Furnace w/ Honeywell WiFi Thermostat I have a Carrier furnace with the cheapest programmable thermostat (TB-PHP01) that came with my house. The thermostat uses six wires: Y, C, R, G, W, and O. ...
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93 views

Need a common wire

So, I recently moved. In my old place, I used my Nest without a common wire and never had an issue. However, in my new place, my Nest thermostat was working fine for about 20 days and started losing ...
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1answer
219 views

How do I temporarily remove a Côr WiFi thermostat by Carrier to repair a plaster wall?

The model number is TP-WEM01-A, installed with the "large backplate", as pictured below. There are no visible screws, etc. I have the manual but it is no help.
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69 views

Did the handyman screw up or is there something wrong with my AC unit?

My landlord recently hired someone to install a common wire from my Goodman AC unit on the roof down to where the thermostat is. The current thermostat works fine, but is non programmable and battery ...
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114 views

Try to rewire Nest and Furnace but Y is not used on Furnace

I installed a Nest at home and it worked OK. Recently, I noticed there was a power issue. Google and others suggested adding a power supply by using the existing G wire because there are only 4 wires. ...
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155 views

Another “How do I add ”c" wire to boiler for Nest

I have tried searching this forum and others, but I could not find anyone with a situation like mine. I thought it better to ask here, rather than damage something. I have a Lennox wall mounted ...
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46 views

Thermostat wire does not go to Furnace

My thermostat wires go to a control panel heat pump system which go to the furnance , i need to wire a c wire but not sure how to go about this with the york control panel
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6k views

Do I need to be legally qualified to install a Hive smart thermostat?

As a competent DIY'er, am I legally allowed to install Hive myself? The reason for the question is I have been asked to provide a cert as I'm selling the house. If not, can someone point me in the ...
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61 views

Honeywell Chronotherm IV Plus thermostat

The word "filter" is flashing on thermostat. The filter is clean. What should I do?
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233 views

Only 2 wires! - Replacing old 240v double pole t-stat with new digital double pole

I'm replacing a old Eaton M402 mechanical 2-pole 240v thermostat with a Cadet TH114A-240D-B double pole, 240v DIGITAL tstat. In the junction box, I only have 2 conductors plus ground. I was expecting ...

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