The charger looks for a battery and at least four volts of power to activate when the controls are used. There may be an internal problem with the charger. One way to test the charger is to charge a battery you know is working properly. If the charger goes to charge without a fault signal, this indicates the charger is functioning correctly. If you receive the same fault indication ,we recommend you contact our support team at:
Toll Free: (877) 571-2391 Hours: 9:00 a.m. to 5:00p.m. (Eastern), Monday through Friday.