Red LED solid - GFDI fuse cleared or missing

What does Red LED solid mean?

A continuously lit red LED indicates that the Ground Fault Detection Interruption (GFDI) fuse inside the Sunny Boy has either cleared (blown) or is not present. This typically happens due to a ground fault in the PV array.

• Ground fault in the PV array caused the GFDI fuse to clear
• GFDI fuse is missing or incorrectly installed.

Click steps to track your progress.

1. 1

   Troubleshoot the PV array to locate and clear any ground faults.

2. 2

   Switch off the external DC disconnect for the Sunny Boy.

3. 3

   Switch off the main AC circuit breaker for the Sunny Boy.

4. 4

   Replace the GFDI fuse with a new fuse of the exact same type and rating (Littelfuse KLKD 1 Amp, 600V AC/DC type).

5. 5

   Re-enable AC and DC power after fuse replacement.