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Heat Pump Thermostat Wiring Chart Diagram - HVAC - The following graphics are meant as a guide only. Always follow manufacturers instructions for both the thermostat and the HVAC system. Additional articles on this site concerning thermostats and wiring can help you solve your problem or correctly wire a new thermostat.

Heat Pump Thermostat Wiring Chart Diagram

Some HVAC manufacturers use other colors for additional control points and it is why we advise you to read the manufacturers instructions. These charts and diagrams only represent the basic system. It is possible your system is equipped with additional HVAC components such as a humidifier or electronic air cleaner. Depending on the manufacturer and the designer of the components will depend on how the additional components are wired or integrated into your system or thermostat.

Heat Pump Thermostat Wiring Chart Diagram

The Basic heat pump wiring for a heat pump thermostat is illustrated here. It corresponds with the chart below to explain the thermostat terminal functions. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires. This way you have a reference. At the minimum draw a picture of it referencing the wires, wire color and what terminal the wire is attached to what terminal. The photo and the drawing reference can be used later to make sure you wire the new thermostat properly.

Heat Pump Thermostat Wiring Chart Diagram

Heat Pump Thermostat Wiring Chart & Diagram - Single Stage Heat Pump Wiring Diagram

Single Stage Heat Pump Wiring Diagram

Heat Pump Thermostat Wiring Chart

This is for use for heatpumps. You should 100% make sure that you have a heat pump system and not an air conditioner with electric heating strips as it is a common mistake for people to mis-identify their HVAC systems. Make sure you do not make this same mistake others make. Air conditioners are different because the reversing valve and defrost controls are unnecessary.

Additionally, remember the RC/RH jumper is only for a heat pump system that has one transformer. It is possible your system could have two transformers. It is rare but still possible. If you have a conventional split system air conditioner or heat pump and there is a jumper from RC to RH then you have a single transformer and do not have to worry about two transformers in your system.

heat pump thermostat wiring diagram

If you are having problems getting it to work it is important to make sure you have the same connections from the air handler to the thermostat to the condensing unit. Additionally, use our other resources here (other articles) for thermostat troubleshooting.

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Heat Pump Thermostat Wiring Chart Diagram

To learn more about heating systems and HVAC use this resource.

If you are purchasing new HVAC equipment don’t forget to check out our HVAC Consumers Buyers Guide Category for lots of help.

See the About the Author page for information about the author of this article.

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