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I wanted to understand which wire is common wire on my Heat Pump

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I wanted to understand which wire is common wire on my Heat Pump

Posted On: March 28, 2023

I wanted to understand which wire is common wire on my Heat Pump

This is connected to my heat pump.


Question from user BeatAlive at heatpumps at reddit.


In a heat pump system, the common wire, often referred to as the "C wire," is an important component for providing continuous power to the thermostat. However, the specific wiring configuration can vary depending on the manufacturer and model of your heat pump.


Typically, the common wire is used to complete the circuit for powering the thermostat and is often connected to the "C" terminal on both the heat pump unit and the thermostat. The C wire is usually colored blue, but it can also be any other solid color, such as black or brown.


To determine the common wire in your heat pump system, you can follow these steps:


  1. Turn off the power to your heat pump system by switching off the circuit breaker that supplies electricity to it. This is important to ensure your safety while working with the wiring.


  2. Locate the control board of your heat pump. This is usually found in the indoor unit or air handler.


  3. Look for a terminal strip on the control board where the thermostat wires are connected. The terminals are typically labeled with letters, including "C" for the common wire.


  4. Examine the existing wiring and identify the wire connected to the "C" terminal. This wire is most likely your common wire.


  5. If the wire colors are not clearly labeled, you can use a multimeter or voltage tester to verify which wire is providing a continuous 24-volt power supply. The common wire should show a voltage reading between 23-28 volts.


Once you have identified the common wire, you can connect it to the "C" terminal on your thermostat. However, I must emphasize that working with electrical systems can be hazardous if you are not experienced or comfortable doing so. If you're unsure or uncomfortable with the process, it's best to consult a professional HVAC technician to assist you with the wiring.



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See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

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