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D. Control Board Check
Before replacing CB 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.
Alarm Reset: If CB is in alarm (beeping), press the "ALARM RESET" button on CB
while CB is beeping.
WARNING! Risk of electric shock. Care should be
taken not to touch live terminals.
Once reset, the icemaker starts at the
1-minute fill cycle. For audible alarm information, see "III.B. LED Lights and
Audible Alarm Safeties."
1) 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, and 5 are
cleaning adjustments and the settings are flexible. For factory default settings, see
"III.C.1. Default Dip Switch Settings."
2) Move the control switch to the "ICE" position. If the red "POWER OK" LED is on, control
voltage is good, continue to step 3. If the "POWER OK" LED is off, check CT secondary
circuit. CT output is 10.5VAC at 115VAC primary input. If the secondary circuit has
proper voltage and the red LED is off, replace CB.
If the secondary circuit does not have proper voltage (10.5VAC), check CT primary
circuit. Check for 115VAC at control switch terminal #2 (BR) and control switch terminal
#3 (BK) to neutral (W). If 115VAC is present at control switch terminal #2 (BR) and not
at control switch terminal #3 (BK), replace control switch. If 115VAC is present at control
switch terminal #3 (BK), check CT coil continuity. Replace as needed. For additional
checks, see "II.I.1. No Ice Production."
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. For the correct
lighting sequence, see the table below. Note that the order of the LEDs from the outer
edge of the control board is 1, 4, 3, 2. Components (e.g., compressor) cycle during the
test.
Control
Board
Correct LED
Lighting Sequence
"J"
1, 4, 3, 2
Following the test, the icemaker begins operation at the 1-minute fill cycle for both.
If the LEDs do not light as described above, replace CB.
