Try setting your system switch to #7 and then power on control and see if you get a screen that says regeneration. If so then you most likely have lost your parameters. (Due to defective battery).Replace the batteries before doing this or it will be a wasted effort.Then you will need to perform the regeneration & re-install your parameters. The main parameters are input with the control system switch on the door of the control. Switch at #7. And the 6300 parameters are installed with switch set to #4. You must exit parameter page and re-enter to have the 6300 parameters displayed on screen.. Also you must press insert key at desired parameter to edit the values.