Why is my heating and cooling reversed on my heatpump?

This behavior can be identified by checking the temperature of the air blowing out from the ducts of the HVAC system when the Zen Thermostat is in heating or cooling mode and the expected behavior is reversed (heat mode blows cool air, cool mode blows hot air). This behavior can happen when the Zen Thermostat system code selected ends with either I, J, K, L, M, N, O or P, where the reversing valve is being energized in the wrong mode. This behavior can be corrected by changing the system code to the opposite letter designation for when the reversing valve is energized.

For a more detailed description of heating and cooling reversed and how to change the system code to the opposite letter designation please see the attachment below.

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