This sounds to me like you have the mode electrical connector and the temperature electrical connectors switched or the wires have a short between circuits. In the diagrams down below I have included the instructions for the removal and installation of the Heating Ventilation and Air Conditioning [HVAC] control unit and the electrical HVAC components in the diagrams down below. I have also included guides for shorts between electrical circuits, shorts to power, and shorts to grounds for you as well. You will need to use a Digital Multi Meter [DMM] to use these guides, so here is a link below explaining how to use one, if needed below:
Please go through these guides and get back to us with what you are able to find out.
Images (Click to enlarge)
Tuesday, December 17th, 2019 AT 11:15 PM