I am trying to add the Coleman Heat Strip to the 3rd AC in the Garage of our 2021 Momentum 395MS

Our Garage AC was installed by the dealer since GD was only shipping units with 2 ACs due to Covid shortage.

I am to install the heat strip and plug it into the AC control box. I tell One Control to use Heat Pump, but the heat never works.

Seems like there might be an HVAC module somewhere that I need to flip a switch on it, but I can't find it(not sure if this part of the current OneControl setups).

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