Dimmer Switch: Testing and Inspection

INSPECT LIGHT CONTROL RHEOSTAT
a. Turn the rheostat knob OFF, and check that there is no continuity between terminal 5 and 4 (Rheostat knob turned to fully counterclockwise).
b. Gradually, turn the rheostat knob from the dark side to bright side, and check that there is continuity between terminal 5 and 4 (Rheostat knob turned to clockwise).
If operation is not as specified, replace the rheostat.