Service Manual

30
I. Diagnostic Tables
Before consulting the diagnostic tables, check for correct installation, proper voltage per
nameplate, and adequate water pressure (10 to 113 PSIG). Check control board using the
steps in "II.D. Control Board Check."
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. Main Transformer
(3 phase SRK)
(208-230VAC/115VAC)
a) Voltage tap switch not set to proper voltage.
b) No neutral. White (W) wire to ground 0VAC. (White (W) wire to
ground should be 60VAC).
3. Water Supply a) Water supply off or improper water pressure.
b) External water lters clogged.
4. Fuse (SRK Control Box) a) Blown.
5. High-Pressure Switch (SRK) a) Dirty condenser.
b) Condensing unit fan(s) not operating.
c) Headmaster (C.P.R.) open.
d) Refrigerant overcharged.
e) Bad contacts.
f) Refrigerant lines or components plugged.
6. Discharge Line Thermostat
(SRK)
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(s) not operating.
7. Wire Harness
(From SRK to KMS)
a) Disconnected or loose connection.
8. Fuse (KMS Control Box) a) Blown.
9. Control Switch a) In "SERVICE" or "OFF" position.
b) Bad contacts.
10. Control Transformer
(115VAC/10.5VAC)
a) Coil winding open or shorted.
11. Bin Control
See "II.E. Bin Control Check"
a) Tripped with bin lled with ice.
b) Ambient temperature too cool.
c) Bulb out of position.
d) Set too warm.
e) Defective.
12. Control Board
See "II.D. Control Board Check"
a) In alarm.
b) Yellow "BC OPEN" LED on (jumper loose or missing).
c) Defective.
13. Inlet Water Valve a) Screen or orice clogged.
b) Coil winding open.
c) Water valve open in freeze cycle.