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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 Trevor Owens on Twintech Heating and Cooling

I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. I’ve used the company in the past for my furnace so I was happy when I recognized Greg at my front door. He’s great and the service is always top notch. I’d highly recommend using twintech for honest, superior service in the Durham region. Thanks!

by Nicole Alain on Twintech Heating and Cooling

I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!

by Courtney Parkes on Twintech Heating and Cooling

Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!

by Jacqueline Graham on Twintech Heating and Cooling

Twintech Heating & Cooling installed my furnace in 2022 and in fall of 2023 installed my Panasonic Heat Pump. Greg and Mitch did a great job. Helped me through the rebate process. Super happy with the Heat Pump. Only used my furnace 5 times this winter. Energy bills lower, carbon emissions lower.Thank you Twintech. I recommend highly!

by Bill Grainger on Twintech Heating and Cooling

Just had a new furnace installed by Twintech. I can’t express how great these guys are at what they do. From the sales to installation they were professional all the way. Very reasonable pricing and courteous during the installation and willing to answer any questions I had. Highly recommended !!!

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