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5. Opti Serve (OS) Sensors
Be sure to check all items in section "IV.C.4. Dipsensing" prior to using this chart. Use
the following charts along with the wiring diagram to troubleshoot the OS sensors.
Problem
[1] No ice dispensed.
[] No water dispensed. a) OS Sensor
5a. Ice Dispensing "Continuous" Mode
Component
Control Board
Solenoid
K Pin 6 LBU
Sensor
K5 Pin 4 W/0
5b. Ice Dispensing "Portion" Mode
Component
Control Board
Solenoid
K Pin 6 LBU
Sensor
K5 Pin 1 W/R
5c. Water Dispensing
Component
Control Board
Solenoid
K Pin 8 DBU
Sensor
K5 Pin 7 R
Possible Cause
a) OS Sensor
b) Change Switch
(Dispense Mode
Switch)
c) Control Board
b) Change Switch
(Dispense Mode
Switch)
c) Control Board
Sensor
-
To
R
To
Sensor
-
To
R
To
Control Board /Other
To
K4 Pin (LBU)
K5 Pin 8 WH
To
K5 Pin 9 BK
1. Dirty sensor.
. Defective.
1. Wrong setting.
. Bad contacts.
3. Loose connection.
1. Loose connection.
. Defective.
1. Dirty sensor.
. Defective.
1. Wrong setting.
. Bad contacts.
3. Loose connection.
1. Loose connection.
. Defective.
Control Board /Other
Neutral/GND
K5 Pin 5 Y
K5 Pin 6 W/BR
Control Board /Other
Neutral/GND
K5 Pin W/BU
K5 Pin 3 W/BK
On
4VAC
5VDC
5VDC
37
Remedy
1. Clean, using Scale Away
(6 fl. oz. (0.8 l) per 1 gal.
(3.8 l) of water) or other
non-abrasive cleaner.
. See chart 5a and 5b
below.
1. Move to desired setting.
. Check for continuity and
replace.
3. Tighten.
1. Tighten.
. See "II.D.4. Control
Board Check Procedure"
and chart 5a and 5b
below.
1. Clean.
. See chart 5c below.
1. Move to desired setting.
. Check for continuity and
replace.
3. Tighten.
1. Tighten.
. See "II.D.4. Control
Board Check Procedure"
and chart 5c below.
Sensor
On
-
10VAC 0VAC
WH
5VDC
0VDC
BK
5VDC
5VDC
Sensor
On
-
10VAC 0VAC
WH
5VDC
0VDC
BK
5VDC
5VDC
Off
0VAC
0VDC
5VDC
Off
Off
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