Service Manual

30
F. Diagnostic Tables
Before consulting the diagnostic tables, check for correct installation, proper voltage
per appliance nameplate, and adequate water pressure (10 to 113 PSIG). Check control
board using the steps in "II.C. Control Board Check."
1. No Ice Production
No Ice Production - Possible Cause
Startup
1. Power Supply a) Off, blown fuse, or tripped breaker.
b) Loose connection.
c) Not within specications.
2. Power Switch a) "OFF" position.
b) Defective.
3. Safety Switch a) Safety switch not engaged.
b) Defective.
4. Power Protect Relay
(DCM-751/752B_H(-OS))
a) Energized. Voltage not within specications.
b) Defective.
5. Control Transformer a) Coil winding open or shorted.
6. 1A 24VAC Fuse (Control Box) a) Blown.
7. Control Board
See "II.C. Control Board Check"
a) In alarm. See "III.B. LED Lights and Audible Alarm Safeties."
b) Defective.
8. Control Switch a) In "DRAIN" position.
b) Defective.
9. Bin Control a) Tripped with bin lled with ice.
b) Proximity switch defective.
c) Actuator paddle does not move freely.
10. High-Pressure Switch a) Control board in 3 or 4-beep alarm. See "III.B. LED Lights and
Audible Alarm Safeties."
Fill Cycle
1. Control Board a) No power to inlet water valve (24VAC).
b) No power to oat switch or not reading oat switch condition.
2. Inlet Water Valve a) Screen or orice clogged.
b) Coil winding open.
3. Water Supply a) Water supply off or improper water pressure.
b) External water lters clogged.
4. Float Switch a) Float does not move freely.
b) Defective.
5. Drain Valve a) Sticking open.