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3. Opti-Serve (OS) Sensors
Be sure to check all items in section "IV.F.2. Ice/Water Dispense" prior to using this chart.
Use the following charts along with the wiring diagram to troubleshoot the OS sensors.
Ice Sensor
1. OS Sensor a) Dirty.
b) Defective. See chart 3a and 3b.
2. Control Board a) No power to infrared sensor.
b) Not reading infrared sensor signal.
Water Sensor
1. OS Sensor a) Dirty.
b) Defective. See chart 3c.
2. Control Board a) No power to infrared sensor.
b) Not reading infrared sensor signal.
3a. Ice Dispense "Continuous"
Component Control Board Sensor To Control Board /Other Sensor Engaged Disengaged
Solenoid K2 Pin 6 (LBU wire) - To Neutral/GND - 120VAC 0VAC
Sensor K5 Pin 4 (W/0 wire) (R wire) To
K5 Pin 5 (Y wire) (W wire) 5VDC 0VDC
K5 Pin 6 (W/BR wire) (BK wire) 5VDC 5VDC
3b. Ice Dispense "Portion"
Component Control Board Sensor To Control Board /Other Sensor Engaged Disengaged
Solenoid K2 Pin 6 (LBU wire) - To Neutral/GND - 120VAC 0VAC
Sensor K5 Pin 1 (W/R wire) (R wire) To
K5 Pin 2 (W/BU wire) (W wire) 5VDC 0VDC
K5 Pin 3 (W/BK wire) (BK wire) 5VDC 5VDC
3c. Water Dispense
Component Control Board To Control Board /Other Engaged Disengaged
Solenoid K2 Pin 8 (DBU wire) To K4 Pin 2 (LBU wire) 24VAC 0VAC
Sensor K5 Pin 7 (R wire) To
K5 Pin 8 (W wire) 5VDC 0VDC
K5 Pin 9 (BK wire) 5VDC 5VDC