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IV. Service Diagnosis
WARNING
• This icemaker should be diagnosed and repaired only by qualified service
personnel to reduce the risk of death, electric shock, serious injury, or fire.
• 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 icemaker/storage bin.
• Make sure all food zones in the icemaker and dispenser icemaker/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 icemaker 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 ("G" CB) are
in the factory default position. S4 dip switch 1, 2, 5, 6 are cleaning adjustments and
the settings are flexible. 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) Remove the front panel. Move the control switch to the "OFF" position, then unplug the
icemaker from the mains socket. Clear any ice from TBC or MBC.
2) Plug the icemaker back into the mains socket, then move the control switch to the "ICE"
position. A 5-second delay occurs. The red "POWER OK" LED on CB comes on. On "G"
CB, the green "BC CLOSED" LED also comes on. If the yellow "BC OPEN" LED is on
(indicating a full bin), check MBC. See "IV.C.2.a) Mechanical Bin Control Check." If CB
LEDs do not turn on, see "IV.F.1. No Ice Production."
3)
1-Minute Fill Cycle – LED 4 is on.
WV 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, WV remains energized through additional 1-minute fill 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:
Confirm that water enters the water tank. If not,
check that the water supply shut-off valve is open and screens or external filters are
clear. Check supply voltage at WV solenoid. If no voltage is present, see "IV.B. Control
Board Check." If voltage is present, check solenoid continuity. If the water tank fills, but
the icemaker fails to start harvest, check for open F/S. See "IV.D. 1. Float Switch Check."
If F/S checks ok, replace CB.
