Surge arrester is defective or back-up fuse tripped

What does 7801 mean?

The surge arrester is defective, or its back-up fuse has tripped. This compromises the inverter's protection against voltage surges. This is a warning that does not affect inverter behavior immediately but requires attention.

• Damage to the surge arrester.
• Tripped back-up fuse for the surge arrester.

Click steps to track your progress.

1. 1

   Check the status and integrity of the surge arrester.

2. 2

   Check the back-up fuse of the surge arrester for continuity and replace if tripped.