Light doesn't come on, does not purify the air.

If the little orange neon light no longer comes on, it is a problem with the high voltage board and transformer. The board sits on top between the plates and the fan.

In my instance, the board had become corroded and shorted the terminals of the voltage regulator located on the board. Also, the ground strap around the ferrite core of the high voltage transformer had become corroded an needed replacement. Also, check the circuit paths from the nearest components to the Voltage Regulator pads. Mine blew one of the circuit traces.

All in all, I replaced the Voltage Regulator, Mouser P/N: 595-UA78L12ACLPE3, Transistor P/N: 512-2N4403BU, Timer IC P/N: 595-NE555P.

The voltage regulator feeds the latter two, as well as the high voltage transformer, I replaced those components as a precautionary measure.

The terminals do get corroded, so check those as well. There are no terminals on the high voltage board other than on top of the proprietary potted black box that feeds the target and neon light. Be careful with the terminal on that box because it breaks easy once corroded. As mine did.

Those components fixed my problem with the high voltage board and no neon light.

Hope this helps, let me know if you have any other questions.