Williams P323096 Fan Switch

I ordered this part and installed it in my gas heater but the fan blower still does not come on. I removed the fan blower and when powered it does work. How do I test the Fan Switch?

Everything is interconnected so it could be anything along the line. You have to trace the wires and check the unit wiring diagram to see where the power is lost. You could contact Williams tech support with your unit's model number for troubleshooting issues.

is this fan switch compatible for a Williams 3501922?

It is actually part of the blower that would go on the 3501922.