Diagnostic Charts; No Ice Production - Hoshizaki Serenity Series KMS-830MLH 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. Main Transformer
(208-230V/115V) (3 Phase Only)
3. Water Supply
4. Fuse (SRK Control Box)
5. High-Pressure Switch (SRK)
6. Discharge Line Thermostat
(SRK)
7. Wire Harness
(From SRK to KMS)
8. Fuse (KMS Control Box)
9. Control Switch
10. Control Transformer
(115V/10.5V)
11. Interlock Switch (Cleaning Valve) a) In open (vertical) position.
12. Control Board
See "IV.B. Control Board Check"
13. Bin Control
See "IV.C. Bin Control Check and
Cleaning"
a) Off, blown fuse, or tripped breaker.
b) Not within specifications.
a) Voltage tap switch not set to proper voltage.
b) Coil winding open or shorted.
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 valves 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) Yellow "BC OPEN" LED on (bin full).
c) Defective.
a) Tripped with bin filled with ice.
b) Actuator does not move freely.
c) Defective.
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