Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C - Manual (Page 38)

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F. Diagnostic Charts
Before consulting the diagnostic charts, check for correct installation, proper voltage per unit
nameplate, and adequate water supply. Check CB using the steps in "IV.C. Control Board
Check." Check that the S1 dip switch settings are in the factory default position. For factory
default settings, see "II.C.3.a) Default Dip Switch Settings."
1. No Ice Production
No Ice Production - Possible Cause
Startup
1a. Power Supply-FS a) Unplugged, off, blown fuse, or tripped breaker.
b) Not within specifications.
1b. Power Supply-SRC a) Off, tripped breaker.
b) Not within specifications.
2. Water Supply a) Water supply off or improper water pressure.
b) External water filters clogged.
3. Power Switch a) "OFF" position.
4. Control Transformer
(115V/24V)
a) Coil winding open or shorted.
5. Fuse (Control Box) a) Blown.
6. Control Board
See "IV.C. Control Board Check"
a) In alarm.
b) BC OPEN, yellow LED on (bin full).
c) Defective.
7. Control Switch a) In "DRAIN" position.
b) Bad contacts.
8. Infrared Sensor Bin Control a) No power, lens dirty, or defective.
b) Control board dip switch 7 off.
9. Mechanical Backup Bin Control a) Tripped with bin filled with ice (9-beep alarm).
b) Proximity switch stuck open.
c) Actuator paddle does not move freely.
Fill Cycle
1. Control Board a) No power to inlet water valve.
b) No power to float switch or not reading float switch condition.
2. Inlet Water Valve a) Screen or orifice clogged.
b) Coil winding open.
3. Float Switch
See "IV.E. Float Switch Check
and Cleaning"
a) Float does not move freely.
b) Defective.
Ice Purge Cycle
1. Control Board a) No power to gear motor.
b) No power to gear motor protect relay circuit.
2. Gear Motor a) Blown fuse.
b) Internal protector open.
c) Gear motor winding open.
d) Mechanical failure.