Opti Serve (Os) Sensors - Hoshizaki DCM-500BAH Service Manual

Problem
[3] No water dispensed. a) Power Supply

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
Possible Cause
b) Water Supply
c) Dispensing Water
Valve
d) Control Board
e) Water Dispense Switch 1. Opti Serve sensor
Possible Cause
a) OS Sensor
b) Dispense Mode Switch 1. Wrong setting.
c) Control Board
b) Dispense Mode Switch 1. Wrong setting.
c) Control Board
1. "OFF" position.
1. Water supply off or
pressure too low.
1. Coil winding open.
. Wiring to dispensing
water valve.
1. Defective.
defective. (OS only)
. Bad contacts. (push
button only)
1. Dirty sensor.
. Defective.
. Bad contacts.
3. Loose connection.
1. Loose connection.
. Defective.
1. Dirty sensor.
. Defective.
. Bad contacts.
3. Loose connection.
1. Loose connection.
. Defective.
44
Remedy
1. Move to "ON" position.
1. Check and get
recommended pressure.
1. Replace.
. Check for loose or open
connection. Repair or
replace.
1. See "II.D.4. Control
Board Check Procedure."
1. See "5. Opti Serve (OS)
Sensors."
. Check for continuity and
replace.
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.