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What if I don’t have a C











Step G goes to a gray wire again a solo connection. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. The ease of doing it this way will vary by furnace and installation. Anonymous Tom, Thank you so much for taking the time to share. But now it is heating season… Evidently I mistakenly connected the W wire to the C, and this allowed power to the thermostat for the display. I need a constant 24v circut and one to switch the boiler on an off…. When I did this on mine it took it a few minutes to actually power up, but once it did it worked just fine.

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Thermostat C External Transformer Method You can configure an to provide power to a smart thermostat. Andy, If nothing else works for you, purchase a dc or ac external power supply the kind used on home alarms. I assume the first step is to check between Com24V and R for voltage. You will need to use the power extender kit. Before finding this post I was getting ready to try and splice wires into my boiler control wiring; this solution is far more elegant.

Step Make sure to verify the voltage and amperage requirements with your thermostat specs. If you are not sure about what you are doing, hire a licensed professional. It does this by learning your routines through the motion sensor. . Once the voltage has been reduced, we can use the lower voltage and a thermostat to control the furnace.

The C Also, the Stelpro is a thermostat. How to Install the Nest Thermostat I purchased , and 2 days later I was ready to install this bad boy and try it out! I have no C wire, and its just a milivolt heat gas fire , which just closes the contact for heat. This device won’t work for C wires. Plug one wire to the c terminal and the other to the Rc on your nest thermostat. If you never run just the fan by itself with no heat it will work to move the G to C at the furnance.

heating Also, ensure that every connector has a wire and stays down. I see speak about 24v transformer…if I have a C labeled spot on my furnace will that automatically be supplying 24v…or would it need an inline voltage transformer? Thermostat will turn on and off furnace or air conditioner to draw some power and keep it alive. Incompatible Wiring and Voltage Standard Wires If you are using the standard wires, then you must know that they are not compatible with the Nest Thermostat. You could buy any 24V transformer to do the job, but is specifically made for smart thermostats. A c-wire is the best option and makes sure that your smart thermostat will have power as long as your house does. So I think running a C wire should be as simple as attaching my Blue at both ends. You may need more or less depending on how far you have to run the wire.

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heating Thermostat C-Wire is that extra cable providing extra power to the smart thermostat. Two pieces of metal touch, and it stops. I now have an oil boiler that has only 2 wires, red and white. I never actually pulled the cover off my thermostat to check whether it had a c-wire or not. Sorry about the slow response, sounds like you have a simple heating thermostat with a fan function, for ease of future conversations use the marked letter designations rather then colors as not everyone uses standard colors.

No wire I am not sure the transformer return is conncted to the cabinet probably not — see wiring diag at When I attach new thermostat it does not power up. This thermostat is hooked up only to heat in a low voltage system. If you’re not, you’ll have to run new cable to the thermostat. In theory the new cable with a common wire would solve any problems, and the system might have worked with just five wires, but I would not recommend it. To check if you already have a c wire hooked up, start by taking your current thermostat off the wall to expose the wiring. Is it okay to connect a third wire to power the thermostat? I found a better writeup when I was googling my fool head off trying to figure out why my replacement base was showing the same issue.

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C I found your article on a last ditch effort before giving up and returning it. Other devices like the Emerson Sensi and use a different approach involving the existing wires. It might still be there… Are there any extra loose wires? Off course a couple of screwdrivers are more than enough to attach the wires together. Although there are some best practices, there are no strict standards that wire name and color adhere to. Man it’s nerdy to answer your own questions.

What’s a C The primary on simple forced air systems often does not - the only connections they offer will be the connections for Rh and W1 no others. The fan pushes cool or hot air through vents into your home. And we all know you need two wires to complete the circuit. I even tried putting the old stat back on. Household wiring is not floating, but rather, is considered to be earth referenced. Could really use some expert advice. Step 11: Setup The thermostat will then get turned on and will help you in completing the setup procedure.

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No wire You also may want to have a caulking gun on hand to seal any new cracks you might be making on the walls. Both units are independent of each other. In the case when your furnace does not have a C terminal, you can utilize an external transformer to provide the neutral line that would otherwise be provided by the C wire. This method works with all the as well as the as long as it is compatible with your heating and cooling systems. Step 3: Remove Old Thermostat This is the tricky part and how you run your wire is going to depend on how your existing wire is run.

What if I don’t have a C











Step

G goes to a gray wire again a solo connection. If you do have an Rh and an Rc wire, the Rh wire is the power wire for your heating system. The ease of doing it this way will vary by furnace and installation. Anonymous Tom, Thank you so much for taking the time to share. But now it is heating season… Evidently I mistakenly connected the W wire to the C, and this allowed power to the thermostat for the display. I need a constant 24v circut and one to switch the boiler on an off…. When I did this on mine it took it a few minutes to actually power up, but once it did it worked just fine.

Advertisement

Thermostat C

External Transformer Method You can configure an to provide power to a smart thermostat. Andy, If nothing else works for you, purchase a dc or ac external power supply the kind used on home alarms. I assume the first step is to check between Com24V and R for voltage. You will need to use the power extender kit. Before finding this post I was getting ready to try and splice wires into my boiler control wiring; this solution is far more elegant.

Advertisement

Step

Make sure to verify the voltage and amperage requirements with your thermostat specs. If you are not sure about what you are doing, hire a licensed professional. It does this by learning your routines through the motion sensor. . Once the voltage has been reduced, we can use the lower voltage and a thermostat to control the furnace.

Advertisement

The C

Also, the Stelpro is a thermostat. How to Install the Nest Thermostat I purchased , and 2 days later I was ready to install this bad boy and try it out! I have no C wire, and its just a milivolt heat gas fire , which just closes the contact for heat. This device won’t work for C wires. Plug one wire to the c terminal and the other to the Rc on your nest thermostat. If you never run just the fan by itself with no heat it will work to move the G to C at the furnance.

Advertisement

heating

Also, ensure that every connector has a wire and stays down. I see speak about 24v transformer…if I have a C labeled spot on my furnace will that automatically be supplying 24v…or would it need an inline voltage transformer? Thermostat will turn on and off furnace or air conditioner to draw some power and keep it alive. Incompatible Wiring and Voltage Standard Wires If you are using the standard wires, then you must know that they are not compatible with the Nest Thermostat. You could buy any 24V transformer to do the job, but is specifically made for smart thermostats. A c-wire is the best option and makes sure that your smart thermostat will have power as long as your house does. So I think running a C wire should be as simple as attaching my Blue at both ends. You may need more or less depending on how far you have to run the wire.

Advertisement

heating

Thermostat C-Wire is that extra cable providing extra power to the smart thermostat. Two pieces of metal touch, and it stops. I now have an oil boiler that has only 2 wires, red and white. I never actually pulled the cover off my thermostat to check whether it had a c-wire or not. Sorry about the slow response, sounds like you have a simple heating thermostat with a fan function, for ease of future conversations use the marked letter designations rather then colors as not everyone uses standard colors.

Advertisement

No wire

I am not sure the transformer return is conncted to the cabinet probably not — see wiring diag at When I attach new thermostat it does not power up. This thermostat is hooked up only to heat in a low voltage system. If you’re not, you’ll have to run new cable to the thermostat. In theory the new cable with a common wire would solve any problems, and the system might have worked with just five wires, but I would not recommend it. To check if you already have a c wire hooked up, start by taking your current thermostat off the wall to expose the wiring. Is it okay to connect a third wire to power the thermostat? I found a better writeup when I was googling my fool head off trying to figure out why my replacement base was showing the same issue.

Advertisement

C

I found your article on a last ditch effort before giving up and returning it. Other devices like the Emerson Sensi and use a different approach involving the existing wires. It might still be there… Are there any extra loose wires? Off course a couple of screwdrivers are more than enough to attach the wires together. Although there are some best practices, there are no strict standards that wire name and color adhere to. Man it’s nerdy to answer your own questions.

Advertisement

What’s a C

The primary on simple forced air systems often does not - the only connections they offer will be the connections for Rh and W1 no others. The fan pushes cool or hot air through vents into your home. And we all know you need two wires to complete the circuit. I even tried putting the old stat back on. Household wiring is not floating, but rather, is considered to be earth referenced. Could really use some expert advice. Step 11: Setup The thermostat will then get turned on and will help you in completing the setup procedure.

Advertisement

No wire

You also may want to have a caulking gun on hand to seal any new cracks you might be making on the walls. Both units are independent of each other. In the case when your furnace does not have a C terminal, you can utilize an external transformer to provide the neutral line that would otherwise be provided by the C wire. This method works with all the as well as the as long as it is compatible with your heating and cooling systems. Step 3: Remove Old Thermostat This is the tricky part and how you run your wire is going to depend on how your existing wire is run.

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