Diagnostic Tables - Hoshizaki DCM-300BAH 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
(DCM-751/752B_H(-OS))
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
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) Defective.
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 (24VAC).
b) No power to float switch or not reading float switch condition.
a) Screen or orifice clogged.
b) Coil winding open.
a) Water supply off or improper water pressure.
b) External water filters clogged.
a) Float does not move freely.
b) Defective.
a) Sticking open.
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