Diagnostic Tables - Hoshizaki DCM-270BAH 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. Control Transformer
4. 1A 24VAC Fuse (Control Box)
5. Control Switch
6. Control Board
See "II.C. Control Board Check"
7. Bin Control
8. 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. Compressor Delay Relay
Startup
a) Off, blown fuse, or tripped breaker.
b) Loose connection.
c) Not within specifications.
a) "OFF" position.
b) Defective.
a) Coil winding open or shorted.
a) Blown.
a) In "DRAIN" position.
b) Bad contacts.
a) In alarm. See "III.B. LED Lights and Audible Alarm Safeties."
b) Defective.
a) Tripped with bin filled with ice.
b) Microswitch defective.
c) Large balance plate 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 (5VDC) 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.
a) 3A breaker tripped.
b) Internal protector open.
c) Motor winding.
d) Mechanical failure.
a) Defective.
a) Defective.
26