Diagnostic Charts - Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C Service Manual

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
1a. Power Supply-FS
1b. Power Supply-SRC
2. Water Supply
3. Power Switch
4. Control Transformer
(115V/24V)
5. Fuse (Control Box)
6. Control Board
See "IV.C. Control Board Check"
7. Control Switch
8. Infrared Sensor Bin Control
9. Mechanical Backup Bin Control
1. Control Board
2. Inlet Water Valve
3. Float Switch
See "IV.E. Float Switch Check
and Cleaning"
1. Control Board
2. Gear Motor
Startup
a) Unplugged, off, blown fuse, or tripped breaker.
b) Not within specifications.
a) Off, tripped breaker.
b) Not within specifications.
a) Water supply off or improper water pressure.
b) External water filters clogged.
a) "OFF" position.
a) Coil winding open or shorted.
a) Blown.
a) In alarm.
b) BC OPEN, yellow LED on (bin full).
c) Defective.
a) In "DRAIN" position.
b) Bad contacts.
a) No power, lens dirty, or defective.
b) Control board dip switch 7 off.
a) Tripped with bin filled with ice (9-beep alarm).
b) Proximity switch stuck open.
c) Actuator paddle does not move freely.
Fill Cycle
a) No power to inlet water valve.
b) No power to float switch or not reading float switch condition.
a) Screen or orifice clogged.
b) Coil winding open.
a) Float does not move freely.
b) Defective.
Ice Purge Cycle
a) No power to gear motor.
b) No power to gear motor protect relay circuit.
a) Blown fuse.
b) Internal protector open.
c) Gear motor winding open.
d) Mechanical failure.
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