．When the switch is turned on, why AVR can’t start the work?

    It is possible caused by: 1) Improper connection, there might be loose contact from the AC mains and or from the AVR to the appliances; 2) overloading, the power capacity of the connected appliance exceed the stabilizer maximum output power. Usually in this case, the fuse will blow up or the circuit breaker will trip off; 3) Different frequency between the AVR output frequency and the frequency of the electrical appliance. Therefore, 1) make sure that the utility power is properly connected to the AVR and the AVR to household appliances; 2) ensure that AVR is not overloaded. 3) make sure the AVR output and loaded appliances in the same frequency range.

．All instructions are displayed normally on the AVR, but why the AVR has no output?

    This may caused by the output circuit failure. And it should only be checked by a qualified electrical appliance repairer.