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f) Freeze Timer (S4 dip switch 9 & 10)
Adjust to proper specification, or the unit may not operate correctly.
The freeze timer setting determines the maximum allowed freeze time to prevent
possible freeze-up issues. Upon termination of the freeze timer, the control board
initiates the harvest cycle. After consecutive freeze timer terminations, the control
board shuts the icemaker down. In this case, see "IV.B.3. Low Ice Production" for
possible solutions. The freeze timer is factory adjusted and no adjustment is required.
4. Control Board Check Procedure
Before replacing a control board that does not show a visible defect and that you suspect
is bad, always conduct the following check procedure. This procedure will help you verify
your diagnosis.
1) Check the S4 dip switch settings to assure that 3, 4, 7, 8, 9, & 10 are in the factory
default position. S4 dip switches 1, , 5, & 6 are cleaning adjustments and the settings
are flexible. For factory defaults, see "II.C.3.a) Default Dip Switch Settings." On control
boards with a "C" "ALP" switch, the switch should be in the "ALP" position.
) Move the control switch to the "ICE" position. The red "POWER OK" LED should be on.
If the LED is on, proceed to step 3. Otherwise, see a and b below.
a. "POWER OK" LED: If the red "POWER OK" LED is off, check the control
transformer secondary circuit. The transformer secondary circuit includes the
cleaning valve interlock switch. Make sure the interlock switch is closed; otherwise,
no control voltage is supplied to the K connector. Transformer output is 10.5V at
115V primary input. If the secondary circuit has proper voltage and the red LED is
off, the control board is bad and should be replaced.
b. Transformer Circuit: If the secondary circuit does not have proper voltage, check
the control transformer primary circuit. Check for 115V at the 10-pin connector.
Check the brown wire at pin #10 to a white neutral wire for 115V. (Always choose a
white neutral wire to establish a good neutral connection when checking voltages.)
For additional checks, see "IV.B.1.[1] The icemaker will not start."
3) The "OUTPUT TEST" button provides a relay sequence test. Make sure the control
switch is in the "ICE" position, then press the "OUTPUT TEST" button. The correct
lighting sequence should be none, , 3, 4, 1. Some components (e.g., the compressor)
will cycle during the test. Note that the order of the relays from the outer edge of the
board is 1, 4, 3, . After checking the sequence, the unit automatically starts at the
1 minute fill cycle. If the LEDs light in a different sequence, the control board is bad and
should be replaced.
CAUTION
S4 Dip Switch Setting
No. 9
No. 10
OFF
OFF
OFF
ON
ON
OFF
ON
ON
17
Time
(minutes)
60
50
70
60
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