What is Rh and RC on thermostat?
What are the 4 wires on a thermostat?
- Red wire for power (24V)
- White wire for heating (connected to W or W1 terminal).
- Green wire for fans
- Blue or yellow wire for cooling (connected to Y)
What is the difference in wiring RC and Rh?
The RC wire (C for Cooling), if connected properly, controls your HVAC cooling. The RH wire (H for Heating) provides power to your HVAC heating. If you are planning to replace your home thermostat, it will be essential that you know which wires to connect to the right terminals in your thermostat.
What is RC wire on Nest Thermostat?
- Residential thermostat (designed for use in homes)
- Commercial thermostat (designed for use in commercial space like office buildings , restaurants etc)
- RV (Residential Vehical stats)
What does Rh mean on a thermostat?
what does RH and RC mean on a thermostat? Rh stands for Red-Heat and Rc stands for Red-Cool. If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat. Yellow/Y is the AC compressor. White/W is the Heating element. Why is there a jumper between R and RC? Rc and R are the same terminal. For nest you don't need a jumper. The reason for the 2 terminals is so you can use one thermostat for 2 types of units.
Do I use RH or RC on Nest thermostat?
The Nest Thermostat E only has an R connector, which is typically where an R wire would go. If you have separate heating and air conditioning systems, you might have separate Rh and Rc wires that come out of the wall and are connected to your system.
Does the red wire go to RC or RH?
There is no standard for the colour of the RH wire, but most units use a red one. The RC wire, on the other hand, refers to “red cooling”. It's the same with the RH wire in that it powers the thermostat. For the RC, it powers the cooling system.
What does RC mean on thermostat?
RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply. (Note: The RC and RH terminals are jumpered together in a four-wire heat/cool system and a single-stage heat pump system but not in a five-wire heating/cooling system.)
What does no power to RC mean on a Nest thermostat?
The E73 error on your Nest thermostat indicates that there is no power detected to the Rc wire. To fix this error, check your wiring, air filter, drain tubes/drip pans, and HVAC fuse and ensure that all of them are working correctly.
Is RC wire same as C wire?
The C and Rc wires are not the same. To install this thermostat you should follow the exact same wiring of the previous thermostat.
Do I need a jumper from R to RC?
If you have a wire in the R terminal, and another wire (not a jumper) in the RC terminal, you will not need to connect the R and RC terminals. See our Basic Wiring article for more info here.
Is r the same as RC on thermostat?
RC is no different and simply means red cooling. The wire is generally red, although there is no color standardization -- but more importantly, the "R" really means that the wire and terminal are hot; it's a live electrical wire. The RC wire connects to the RC terminal, which controls the cooling system.
What does no power to Rc wire mean?
This usually happens because the wire isn't properly connected. It might also mean that the wire was incorrectly entered in the app. Check the system wires to make sure they are correctly entered and properly connected. Important: You must turn the system off before checking the system wires.
How do you reset a Nest thermostat?
To reset your Nest thermostat follow these steps:Press the thermostat face to open the Quick View menu.Choose the Settings icon.Turn the ring to Reset and press to select.Turn the ring to All Settings and press to select.You'll have to confirm you want to proceed.More items...
Why is my Nest not holding a charge?
If your Nest Thermostat won't stay charged, your battery is probably draining rather quickly. Confirm that it is actually drawing enough power from your HVAC system. Leave your Nest Thermostat Battery to charge for a while, manually plugging it in via USB, so that it can cross the threshold that puts it in sleep mode.
How do I know when my Nest thermostat is charged?
A blinking light on the front of your thermostat confirms that it's charging. The color of the light will depend on the battery level of the thermostat when you charge it. Usually, your thermostat will take about half an hour to recharge.
Does Nest need to be charged?
The Nest thermostat charges its batteries using the wires of your heating and cooling system, so you shouldn't have to do anything.
Where does red wire go on thermostat?
The red wire should be connected with the Thermostat RH terminal. You can also connect it to the RC terminal with a jumper wire between the RH and the RC. If you only have one R terminal for both heating and cooling, connect it to that.
Is R wire the same as RC?
RC is no different and simply means red cooling. The wire is generally red, although there is no color standardization -- but more importantly, the "R" really means that the wire and terminal are hot; it's a live electrical wire. The RC wire connects to the RC terminal, which controls the cooling system.
What are R and Rc wires on thermostat?
Rh stands for Red-Heat and Rc stands for Red-Cool. If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat.
Where does Rh wire go on thermostat?
The Rh wire connects to your heating system as opposed to your cooling system. This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. The Rh wire connects to the RH terminal on your thermostat.
Can you put more than one wire in a Nest thermostat?
Putting more than one wire into a Nest thermostat connector can damage your system and your thermostat.
Do Google Nest thermostats have jumper wires?
Unlike most thermostats, the Google Nest thermostats do not use jumper wires. If your current thermostat has jumper wires, do not connect them to your Nest thermostat. Always follow the wiring diagram the Nest app gives you during setup to connect your Nest thermostat.
What is the Rc Wire?
You may have noticed a lot of power issues associated with your Nest after receiving this E73 message. It’s partially correct to assume, then, that the Rc wire gives power to the thermostat. It could be a bit more complicated than that, though.
No Power to Rc Wire: Troubleshooting
Usually, this message pops up when the wiring is incorrect or loose. Other reasons for this message include the following:
Still Not Working?
The above solutions are usually enough to fix the E73 error message. If Nest still isn’t working properly after following these steps, it’s time to contact Google Nest Customer Support. Explain all the measures you’ve taken thus far.
Related Questions
No. In the case of only one R cable, the Rc wire powers the heating and cooling system. If you have an Rh and an Rc wire, the Rc wire powers the air conditioner. The C wire provides power to the thermostat.
Summing It Up
An E73 error means there’s no power going to your Nest’s Rc wire. This can affect the function of your air conditioner, the Nest’s power, or both.
