Fuse Blown

What does FU mean?

This fault indicates that an internal fuse in the inverter has blown, likely due to an overcurrent condition, a short circuit, or an internal component failure. A blown fuse often signifies a significant protective event and requires careful investigation before replacement. Operating with blown fuses can lead to further damage to the inverter's internal circuitry.

Complete Troubleshooting Guide

1. 1

   Immediately disconnect all power from the inverter.

2. 2

   Visually inspect the internal fuses of the inverter for physical damage or evidence of blowing.

3. 3

   Before replacing any fuses, thoroughly investigate the cause of the fuse blowing (e.g., motor short, ground fault, internal component failure).

4. 4

   Perform insulation resistance tests on the motor and motor cabling to rule out external shorts.

5. 5

   If the cause is not external, internal inspection by a qualified technician or factory service may be required.