Ice Thickness Sensor - Scotsman Prodigy C0322 Technical & Service Manual

Ice Thickness Sensor

1. Test using the controller's indicator light. Observe the Ready To Harvest light. Shut the machine off. Use
a wire to connect the metal part of the Ice Thickness sensor to the evaporator or simply remove the Ice
Thickness Sensor and touch its metal surface to the metal control box wall. The Ready for Harvest light should
go ON.
2. Test with an Ohmmeter. Disconnect electrical power. Open the control box cover. Unplug the ice thickness
sensor lead from the controller. Connect an ohmmeter lead to the ice thickness sensor lead, touch the other
ohmmeter lead to the ice machine chassis. There must be an open circuit. If there is continuity, the sensor
must be replaced. If there is no continuity, touch the ohmmeter lead to the metal part of the ice thickness
sensor. There should be continuity. If open, check the ice thickness sensor for scale build up. Clean and
recheck. If still open, replace the ice thickness sensor.
3. Test the controller's ice thickness sensor circuit by connecting a wire from J10 to ground. Reconnect
electrical power. The Ready for Harvest light should go ON.
Ready To Harvest light is
ON when water contacts ice
thickness sensor.
Ice Thickness Sensor
January 2015 Page 53