Ok. Time to check the switch itself. With machine off, put your meter on ohms, and connect to the switch. Close the switch and see if the meter reads close to zero ohms. If yes, then the switch is working and you may have a wire issue.
If it does not read zero, take a crisp $20 bill and put between the contacts, push the contacts together and pull the bill through. Check again to see if the switch closure now reads zero ohms. If zero ohms, go back into switch test as mentioned above.
If it’s a wire issue, consult your manual, and put your meter from the connector pin in the head to one side of the switch. Do the same for the other side of the switch.
If both wires read good, go from a point on the circuit board to each side of the switch to see if the connector has a bad pin.