Diagnostic Charts; No Ice Production - Hoshizaki Serenity KMS-822MLH Service Manual

F. Diagnostic Charts
Before consulting the diagnostic charts, check for correct installation, proper voltage per unit
nameplate, and adequate water supply. Check CB using the steps in "IV.B. Control Board
Check." Check the dip switch settings to assure that S4 dip switch 3, 4, 7, 8, 9, 10, and
S5 dip switch 1 through 5 are in the factory default position. S4 dip switch 1, 2, 5, 6 are
cleaning adjustments and the settings are flexible. For factory default settings, see "II.C.3.a)
Default Dip Switch Settings."

1. No Ice Production

No Ice Production - Possible Cause
1. Power Supply
2. Water Supply
3. Fuse (SRK Control Box)
4. High-Pressure Switch (SRK)
5. Thermostat (SRK)
6. Wire Harness
7. Fuse (KMS Switch Box)
8. Control Switch
9. Control Transformer
(115V/10.5V)
10. Interlock Switch (Cleaning Valve) a) In open (vertical) position.
11. Control Board
See "IV.B. Control Board Check"
12. Bin Control
See "IV.C. Bin Control Check and
Cleaning"
13. Inlet Water Valve
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) Blown.
a) Dirty condenser.
b) Condensing unit fan not operating.
c) Headmaster (C.P.R.) open.
d) Refrigerant overcharged.
e) Bad contacts.
f) Refrigerant lines or components plugged.
a) Ambient temperature too warm.
b) Compressor or compressor components faulty.
c) Defective.
d) Hot gas valve open.
e) Dirty condenser.
f) Condensing unit fan not operating.
a) Disconnected or loose connection.
a) Blown.
a) In "WASH" or "OFF" position.
b) Bad contacts.
a) Coil winding open or shorted.
b) Bad contacts.
a) In alarm.
b) BC OPEN, yellow LED on (bin full).
c) Defective.
a) Tripped with bin filled with ice.
b) Actuator does not move freely.
c) Defective.
a) Screen or orifice clogged.
b) Coil winding open.
c) Open in freeze cycle.
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