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G. Diagnostic Tables
1. No Ice Production
No Ice Production - Possible Cause
1. Power Supply a) Off, blown fuse, or tripped breaker.
b) Not within specications.
2. Main Transformer
(3 phase and KM-650MWH-M
only) (208/230VAC/115VAC)
a) Voltage tap switch not set to proper voltage.
b) Coil winding open or shorted.
3. Fuse (Control Box) a) Blown.
4. Thermostatic Bin Control
See "II.D. Bin Control Check"
a) Tripped with bin lled with ice.
b) Ambient temperature too cool.
c) Set too warm.
d) Bulb out of position.
e) Open contacts, defective.
5. Control Switch a) In "OFF" or "WASH" position.
b) Bad contacts.
6. High-Pressure Switch a) Dirty condenser.
b) Fan motor not operating.
c) Refrigerant overcharged.
d) Bad contacts.
e) Refrigerant lines or components plugged.
7. Control Transformer
(115VAC/10.5VAC)
a) Coil winding open or shorted.
8. Control Board
See "II.C. Control Board Check"
a) In alarm.
b) Yellow "BC OPEN" LED on (bin full) ("G" control board).
c) Defective.
9. Mechanical Bin Control
See "II.D. Bin Control Check"
a) Tripped with bin lled with ice.
b) Actuator does not move freely.
c) Defective.
10. Water Supply a) Water supply off or improper water pressure.
b) External water lters clogged.
11. Inlet Water Valve a) Screen or orice clogged.
b) Coil winding open.
c) Water valve open in freeze cycle.
12. Float Switch
See "II.E. Float Switch Check
and Cleaning"
a) Float does not move freely.
b) Defective.
13. Compressor a) Compressor relay/magnetic contactor contacts bad or coil winding
open.
b) Start capacitor or run capacitor defective (single phase).
c) Internal protector open.
d) Start relay contacts bad or coil winding open (single phase).
e) Compressor defective.
14. Hot Gas Valve a) Closed in harvest cycle.
b) Open in freeze cycle.