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IV. Service Diagnosis
WARNING
• This icemaker should be diagnosed and repaired only by qualied service
personnel to reduce the risk of death, electric shock, serious injury, or re.
• Risk of electric shock. Use extreme caution and exercise safe electrical practices.
• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.
• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are
securely in place after the icemaker is serviced. Make sure that none have fallen
into the dispenser unit/storage bin.
• Make sure all food zones in the icemaker and dispenser unit/storage bin are clean
after service. For cleaning procedures, see "VI. Cleaning and Maintenance."
A. Diagnostic Procedure
The diagnostic procedure is basically a sequence check which can be used at icemaker
startup or for system diagnosis. This procedure allows you to diagnose electrical system
and component failures. Before conducting the diagnostic procedure, 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 exible.
For factory default settings, see "II.C.3.a) Default Dip Switch Settings." As you go through
the procedure, check to assure the components energize and de-energize correctly. If
not, those components and controls are suspect.
1) Turn off the power supply, then access the control box. Clear any ice from BC.
2) Turn on the power supply, then move the control switch to the "ICE" position. A5-second
delay occurs. The red "POWER OK" LED and the green "BC CLOSED" LED on CB
come on. If the yellow "BC OPEN" LED is on, check BC. See"IV.C.Bin Control Check
and Cleaning."
3) 1-Minute Fill Cycle – LED 4 is on. WV1 energizes. After 1 minute, CB checks for a
closed F/S. If F/S is closed, the harvest cycle begins. If closed, continue to step 4. If
F/S is open, WV1 remains energized through additional 1-minute ll cycles until water
enters the water tank and F/S closes (low water safety protection during initial start up
and at the end of each harvest). Diagnosis: Conrm that water enters the water tank.
If not, check that the water supply shut-off valve is open and screens or external lters
are clear. Check supply voltage at WV1 solenoid. If no voltage is present, see "IV.B.
Control Board Check." If voltage is present, check solenoid continuity. If the water tank
lls, but the icemaker fails to start harvest, check for open F/S. See "IV.D. 1. Float Switch
Check." Check termination of 1-minute timer in CB. See "IV.B. Control Board Check."