Diagnostic Tables - Hoshizaki F-500BAJ Service Manual

F. Diagnostic Tables
Before consulting the diagnostic charts, check for correct installation, proper voltage per
appliance nameplate, and adequate water supply. 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. Water Supply
3. Power Switch
4. Control Transformer
(115V/24V)
5. Fuse (3A)
6. Bin Control
See "II.D. Bin Control Check."
7. Control Switch
8. Compressor Control Relay
9. Evaporator Heater
(-C model)
1. Control Board
2. Inlet Water Valve
1. Float Switch
See "II.E. Float Switch Check
and Cleaning."
2. High-Pressure Switch
3. Control Board
See "II.C. Control Board Check."
4. Gear Motor
Startup
a) Unplugged, off, blown fuse, or tripped breaker.
b) Not within specifications.
a) Water supply off or improper water pressure (10 to 113 PSIG).
b) External water filters clogged.
a) "OFF" position.
a) Coil winding open or shorted.
a) Blown.
a) Open.
b) Defective.
a) In "DRAIN" position.
b) Defective.
a) Defective.
a) Defective.
Startup/Fill Cycle (reservoir empty)
a) Defective.
a) Screen or orifice clogged.
b) Defective.
Startup/Ice Purge Cycle (reservoir full)
a) Float does not move freely.
b) Defective.
a) Dirty air filter or condenser.
b) Condenser fan motor defective.
c) Refrigerant overcharge.
d) Refrigerant lines or components plugged.
a) Defective.
a) External or internal protector open.
b) Gear motor winding open.
c) Mechanical failure.
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