If the unit was running and shuts down, attempting to restart, clear the alarm by pressing the ENTER button twice, then press AUTO. Next, remove some of the loads. Try putting it back in AUTO and then restart. If it does not start after doing this, you will need to place a service call.
If the unit will not start in AUTO when there is utility loss, clear the alarm by pressing the ENTER button twice, then press AUTO. Then, using the control panel, check the battery. To do this, navigate to the BATTERY MENU option from the MAIN MENU. If it states ‘check battery’, try replacing the battery. If it states that your battery is ‘good’ when being checked, contact an authorized service dealer.