Diagnostic Tables; No Ice Production - Hoshizaki DCM-751BAH Service Manual

F. Diagnostic Tables
Before consulting the diagnostic tables, check for correct installation, proper voltage per
appliance nameplate, and adequate water pressure (10 to 113 PSIG). Check control
board using the steps in "II.C. Control Board Check."

1. No Ice Production

No Ice Production - Possible Cause
1. Power Supply
2. Power Switch
3. Safety Switch
4. Power Protect Relay
5. Control Transformer
6. 1A 24VAC Fuse (Control Box)
7. Control Board
See "II.C. Control Board Check"
8. Control Switch
9. Bin Control
10. High-Pressure Switch
1. Control Board
2. Inlet Water Valve
3. Water Supply
4. Float Switch
5. Drain Valve
1. Control Board
2. Gear Motor
3. Coupling
4. Gear Motor Protect Relay
Startup
a) Off, blown fuse, or tripped breaker.
b) Loose connection.
c) Not within specifications.
a) "OFF" position.
b) Defective.
a) Safety switch not engaged.
b) Defective.
a) Energized. Voltage not within specifications.
b) Defective.
a) Coil winding open or shorted.
a) Blown.
a) In alarm. See "III.B. LED Lights and Audible Alarm Safeties."
b) Defective.
a) In "DRAIN" position.
b) Bad contacts.
a) Tripped with bin filled with ice.
b) Proximity switch defective.
c) Actuator paddle does not move freely.
a) Control board in 3 or 4-beep alarm. See "III.B. LED Lights and
Audible Alarm Safeties."
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.
a) Water supply off or improper water pressure.
b) External water filters clogged.
a) Float does not move freely.
b) Defective.
a) Sticking.
Ice Purge Cycle
a) No power to gear motor.
b) No power to gear motor protect relay circuit (5VDC).
a) 3A fuse blown.
b) Internal protector open.
c) Motor winding.
d) Mechanical failure.
a) Defective.
a) Defective.
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