．When you switch on the AVR, why the LED lights display “unusual” ?

This may be caused by the following reasons: 1) high or low input voltage exceeds the AVR input voltage range; 2) high temperature protection; 3) circuit failure. Therefore, we should 1) wait until the input voltage return back to the AVR adjustment range, 2) switch off the AVR and let it cool down, 3) bring to the service center for repair.

．Why does the AVR immediately trip off when it is switch on?

If the AVR immediately trip off, it means that the loading capacity must exceed the fuse amperage or circuit breaker amperage; in this case, you need to reduce the load, or use a larger capacity of the AVR to power the loaded appliance.