See attached PDF of this fix. There is a locating pin that is supposed to hold the horizontal board in place. If another Crossfire Owner previously did this DIY Fix, there may be some glue applied there that has the board secured to the housing. This DIY fix corrected my erratic HVAC module erratic operation, along with a new Blower Motor Resistor. (Note: After I did the circuit board fix, when I tried the system once it was all put back together, same erratic operation. I then replaced the Blower Motor Resistor and the HVAC operation was back to as new.)

There is also a recommended DIY fix that addresses the small potentiometer that sits behind the control ****. This could also be the cause of your erratic operation. Jury is still out on which fix solves the HVAC erratic operation. I'm a believer that there are 3 possible faults:

1) Circuit Board Connectivity
2) Defective Potentiometer
3) Blower Motor Resistor