88 Part Number 80-1479-3 7/10
Control Board Testing
All replacement S Model control boards and ice
machines with serial numbers larger than 110924847
have a control board that includes a diagnostic test
cycle. The control board can be identified by the blue
printed circuit board and a push button switch on the
bottom left corner labeled “service mode”.
CONTROL BOARD TEST CYCLE
1. Place the toggle switch in the ice position.
2. Press and hold the test button for 5 seconds.
3. The control board memory is cleared.
A. All safety limits are cleared
B. Resets to factory default settings
C. Calibration is cleared for ice thickness &
water level probe.
4. The control board relays close at 1 second
intervals and energize the corresponding control
board light.
5. The relays remain closed and the lights remain
energized for 3.5 minutes to allow time to test
voltage at components.
6. After 3.5 minutes the ice machine automatically
exits the test cycle.
7. An ice making cycle will automatically start
(unless the toggle switch is moved to OFF).
8. Water level and ice thickness probe calibration
are processed and stored in control board
memory during the second
ice making cycle.
The test cycle can be terminated at anytime by moving
the toggle switch from ICE to OFF, or by disconnecting
and reapplying line voltage to the ice machine.
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