Service Manual

37
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 specications.
2. Fuse (inside fused disconnect,
if any)
a) Blown.
3. Thermostatic Bin Control
See "II.D.1. Thermostatic 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.
4. Fuse (Control Box) a) Blown.
5. Control Switch a) In "OFF" or "SERVICE" 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:
Jumper loose or missing on models with TBC.
Bin full on models with MBC.
c) Defective.
9. Mechanical Bin Control
See "II.D.2. Mechanical Bin
Control Check and Cleaning"
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 orice 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.
c) Internal protector open.
d) Start relay contacts bad or coil winding open (single phase).
e) Compressor defective.