My PetSafe® Guardian® GPS 2.0 Dog Fence + Tracking Charging Base Has a Red Light
A red light on the charging base indicates an error. While the base is plugged in, press and hold the reset button continuously until you see the LED pulse green for 5 seconds, then blink red for 15 seconds, and then turn off.
You may have to reconnect the base. Visit How To Set Up My PetSafe® Guardian® GPS 2.0 Dog Fence + Tracking System.