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How To Wire A Carrier Heat Pump Thermostat?

How To Wire A Carrier Heat Pump Thermostat?

You might wish to install a Carrier heat pump thermostat as a homeowner but be unsure about how to proceed.

The wiring instructions for a Carrier heat pump thermostat are as follows:

  1. Find out how the wires function.
  2. Disconnect the old thermostat’s cables.
  3. The new thermostat’s wiring

All you need to do to wire a Carrier heat pump thermostat is attentively follow the instructions. To get in-depth instructions on how to wire a heat pump thermostat, continue reading.

Carrier Heat Pump Thermostat Wiring Diagram

How To Wire A Carrier Heat Pump Thermostat?

Understanding the meanings of the wire colors is crucial when wiring a Carrier heat pump thermostat. Because of this, most terminals where the wires will enter thermostats are labeled by the manufacturer. For illustration, a green terminal will receive a connection from a green cable.

To accomplish this, it is imperative that you adhere to the following procedures:

Step 1: Understand How Wires Function

You must remove the thermostat in order to examine the colored wires underneath in order to clearly see the wires in a heat pump thermostat. You must have a fundamental grasp of the wires’ roles before installation can be completed.

Expect to see the following wire colors:

  • white (connected to the heating) (linked to the heater),
  • orange (attached to the heat pump and operate the reversing valve) (connected to the heat pump and control the reversing valve),
  • green (attached to the fan) (connected to the fan),
  • both yellow (connected to the compressor).

And you’ll observe:

  • The cooling switch is related to the color red (‘C’),
  • The heating switch is indicated by the color red (‘H’),
  • Furthermore, Blue (common wire).

You can move on to the following stage now that you have a general idea of what each wire represents.

Step 2: Cut The Wires From The Outdated Thermostat

Start with the C-wire that powers the old thermostat when you wish to unplug its cables. The lack of a C-wire on some thermostats does not, however, prevent them from operating. It is advised that you seek a specialist if you are unable to find the C-wire.

Step 3: Wire The New Thermostat

The replacement thermostat can then be wired once your C-wire is ready. For reference during installation, you can also record a photo or a video of the connections in the interim. You can now turn on the thermostat after wiring it.

What Is The Price Of Wiring A Carrier Heat Pump Thermostat?

How To Wire A Carrier Heat Pump Thermostat?

A Carrier heat pump thermostat’s wiring typically costs between $100 and $400. Even some homeowners shell out extra money when connecting an upgraded thermostat.

All thermostats are capable of controlling the heating and cooling system, but some are more effective than others. The cost of the wiring will depend on the type of thermostat utilized.

What Takes Place If A Heat Pump Thermostat Is Wired Incorrectly?

Inadequate heat pump thermostat wiring has the following effects:

  • Electrical jolt
  • High electricity prices
  • Unfavorable temperature
How To Wire A Carrier Heat Pump Thermostat?

The worst part is that the thermostat might not function at all. It might be necessary to use a sophisticated technology to fix this, which would raise the cost of repairs.

For a non-professional, wiring a heat pump thermostat may be more difficult. Some experts cautioned against considering the wiring of a heat pump thermostat to be a do-it-yourself project.

Which Wire—An “O” Or “B” Wire—Is Used By My Heat Pump?

The O-wire and the B-wire are used with heat pumps. The O-primary wire’s job is to switch your home’s reversing valve from heating to cooling. The B-wire does the opposite, switching the same valve from cooling to heating your home.

O-wires and B-wires are not available on all devices, however this has no impact on how well they function. You can look at the setup to determine whether your heat pump is “O” or “B.” The unit may not heat or cool when set to either “O” or “B,” despite the fact that it is common to mix up the wires.

Is A Jumper Required Between “R” And “RC”?

Yes, a jumper is required to power the heating and cooling systems, respectively, between “R” and “RC”. Therefore, since the thermostat receives power from the “R” and “RC” terminals, have your jumper checked when you discover that your system is not cooling.

If the “RC” terminal lacks a jumper wire but has one in the “R” terminal, you can connect the two terminals using the jumper plug. In the same way, if there is a wire in the “RC” terminal but none in the “R” terminal, you must shift the jumper wire from “RC” to “R” and connect them using a jumper plug.

Will The “R” Wire Work As “C”?

No. You can still have a functioning thermostat even if you can’t locate a C-wire. However, there are alternative solutions available besides the R-wire, which are as follows:

G-Wire To C-Wire Conversion

Despite the fact that G-wire has drawbacks of its own, it is a superior substitute for C-wire. Although the G-wire is often used to power the fan, using it in place of the C-wire will change how the fan operates. The G-wire just needs to be taken out of its terminal and inserted into the C-terminal.

Examine Any Unnoticed C-Wires

Alternately, you might search for a hidden C-wire. Since the old thermostats ran on batteries, they didn’t require a C-wire. Therefore, the common wire that isn’t in use is still present inside the wall. Determine if you ought to put your attention there.

Before removing the thermostat’s front plate, turn off the electricity to your system. To access the old wire connections, you should take this action. Remove the backplate of the thermostat with a screwdriver. Make sure to pull the cables out as well when removing it. Verify the thermostat’s wiring for any issues.

Typically, it resembles a sheath with projecting wires of various colors. You will have found the C-wire if you are able to locate a wire that covers the sheath.

Utilize An Adapter

Another option is this. While some thermostats typically come with home kits, some don’t. After receiving your thermostat, if you still can’t locate any, you can purchase one on your own. A diode that works to split the electricity from the old wire so that each wire has its own is part of the kit.

Although it could appear like a simple task, hiring a professional is advised in this case. In order to prevent incorrect wire connections, do this.

How Can I Check The Thermostat On My Heat Pump?

How To Wire A Carrier Heat Pump Thermostat?

Your thermostat may be defective if it is not performing as it should. Here are various methods for testing your thermostat:

Check For Dust Accumulation

Checking for dust or other debris is the first step because they can reduce the thermostat’s effectiveness. If you see that there has been a build-up of dust, you can vacuum it up or wipe it off with a dry towel. To avoid damaging the device, be careful not to get the vacuum too close to it when doing this.

Examine The Battery

It could be that the battery is defective or improperly fitted. You can reinstall the battery if the initial installation was incorrect. However, if the battery is broken, you’ll need to find a replacement.


A fundamental knowledge of wires and their functions is necessary to wire a heat pump thermostat. Finding out how the wires function, removing them from the old thermostat, and then wiring the new thermostat are all that are required to wire a Carrier heat pump thermostat. If you can’t complete the task on your own, don’t be afraid to call a professional.

How To Wire A Carrier Heat Pump Thermostat?

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Written by HVAC Contributor

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