Charger will not power on at all; no LEDs, no network connection, completely dead.

Safety first: Treat the circuit as live until proven otherwise. Turn off the breaker before opening the unit.

• Check breaker and upstream GFCI: Verify the dedicated breaker feeding the JuiceBox is ON and not tripped. Reset if necessary. If on a GFCI breaker, reset it as well.
• Test the outlet (plug-in models): Plug another high-draw device (e.g., space heater) into the same outlet to confirm power is present.
• Inspect input wiring (hardwired models): With power OFF, open the JuiceBox and confirm that line, line/neutral, and ground conductors are securely attached to the input terminal block. Tighten any loose screws.
• Internal fuse check: Many JuiceBox units include an internal fuse on the main control board. With power OFF, visually inspect and test the fuse with a multimeter. Replace with the exact same type and rating if blown, and investigate why it blew (surge, short, etc.).
• Board failure: If supply voltage is present at the input terminals but the unit remains dead, the main control board power supply section is likely failed and the board must be replaced.