Diagnostic Charts - Hoshizaki DCM-300BAH Service Manual

F. Diagnostic Charts
Before consulting the diagnostic charts, check for correct installation, proper voltage per
unit nameplate, and adequate water pressure (10 to 113 PSIG). Check CB using the steps
in "IV.C. Control Board Check."
1. No Ice Production
1. Power Supply
2. Water Supply
3. Power Switch
4. Safety Switch
5. Power Protect Relay
6. Control Transformer
(115VAC, 24VAC, and 10.5VAC)
7. 1A Fuse (24VAC Control Board)
8. .5A Fuse (10.5VAC Control
Board)
9. Control Board
See "IV.C. Control Board Check"
10. Control Switch
11. Bin Control
12. High-Pressure Switch
1. Water Control Relay
2. Inlet Water Valve
3. Float Switch
See "IV.E. Float Switch Check
and Cleaning"
Startup
a) Off, blown fuse, or tripped breaker.
b) Not within specifications.
a) Water supply off or improper water pressure.
b) External water filters clogged.
a) "OFF" position or defective.
a) Not engaged or defective.
a) Voltage not within specifications.
b) Defective.
a) Coil winding open or shorted.
a) Blown.
a) Blown.
a) Defective.
a) In "OFF" or "DRAIN" position.
b) Defective.
a) Tripped with bin filled with ice.
b) Proximity switch stuck open.
c) Actuator paddle does not move freely.
a) Dirty condenser.
b) Ambient temperature too warm.
c) Fan motor not operating.
d) Refrigerant overcharged.
e) Bad contacts.
f) Refrigerant lines or components restricted.
Fill Cycle
a) Energized (upper float switch stuck closed).
b) Defective.
a) Screen or orifice clogged.
b) Coil winding open.
a) Float does not move freely.
b) Defective.
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