How do i reset the Chrysler 300M climate control?

To reset the Chrysler 300m climate control, start the engine but do not move the vehicle. Set the Temp control to 75 degrees. Press and hold the Floor, Mix (vent/defrost), and Defrost buttons at the same time. The floor is a bottom button and the others are upper.The control head will begin to blink and enter a diagnostic mode. Once the unit has gone through its diagnostics it will either return to its normal mode (with all air doors calibrated) or it will return one or more of 16 different error codes between 23 and 51. A repair shop will be able to tell You what these codes mean.