Hoshizaki FS-1022MLH-C Ice Maker User Manual


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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 specications.
1b. Power Supply-SRC a) Off, tripped breaker.
b) Not within specications.
2. Water Supply a) Water supply off or improper water pressure.
b) External water lters 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 lled 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oatswitchornotreadingoatswitchcondition.
2. Inlet Water Valve a) Screen or orice 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.
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