Rachio 3 works on 220 volts?

More than likely, a recent thread is dealing with issues arising from a high Surge / wrong input issues:

Note that the first reply in above thread has a link to another, related issue.

You will need to source a right power supply (rated for 220V), and possibly replace several components on the board. It really helps if you are comfortable with soldering at the very least you should be comfortable with taking apart the unit and providing photos & performing basic analysis using a multi meter.