Service Manual

20
Pump-Out Diagnosis: In the freeze cycle before pump-out (see table above), after
thermistor reaches 36°F (2°C) and the 5 min. short cycle protection timer has
terminated, disconnect the FS connector. Check that CB LEDs 4, 5, 6, and 7are on, PM
stops, then restarts, DV energizes, and water is owing down the drain through DV. If not,
continue to steps below.
a) CB Diagnosis: Conrm FM de-energizes. If FM is energized with LEDs 4, 5, 6, and
7 on, replace CB. If PM does not stop and restart and DV does not energize, check
that CB LEDs 4, 5, 6, and 7 are on. Ifnot, replace CB. IfLEDs 4, 5, 6, and 7 are
on and PM is not energized, check for 115VAC at CB K5 #3 (DBU) to neutral(W).
If115VAC is not present, replace CB. If115VAC is present at CB K5 #3 (DBU) and
PM is not energized, continue to "b) PM Diagnosis:" below. If PM is energized and
DV is not energized, check for 115VAC at CB K5 #6 (GY) to neutral(W). If LED 4 is
on and 115VAC is not present at CB K5 #6 (GY), replace CB.
b) PM Diagnosis: Conrm water is owing down DV. If not check for 115VAC CB K5 #3
(DBU) to neutral(W). If 115VAC is not present, replace CB. If 115VAC is present and
PM is de-energized, check PM capacitor, motor winding, wiring connections, and
impeller for binding.
c) DV Diagnosis: Conrm water is owing down DV. If not check for 115VAC at CB K5
#6 (GY) to neutral (W). If 115VAC is not present, see "b) CB Diagnosis:" above.
If 115VAC is present at CB K5 #6 (GY) and DV is de-energized, check DV coil
continuity, make sure the drain line is not clogged and that DV is clean and operating
properly.
8) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5a) above.
Note: Appliance continues to cycle until BC is satised or power is switched off. The
appliance always restarts at the 1-min. ll cycle.
2. Shutdown Diagnosis
When BC is activated (BC open), the “POWER OK” LED ashes. There is a delay before
the shutdown sequence begins. The delay varies depending on the cycle the icemaker is
in at the time of activation. For details, see the table below.
Cycle at Bin
Control Activation
Shutdown
Fill Cycle 15 sec. after activation.
Harvest Cycle 15 sec. into the freeze cycle.
Freeze Cycle 15 sec. after activation if activated at least 15 sec. before the 5-min. short cycle
protection timer terminates (timer starts when the thermistor temperature achieves
36°F (2°C)(5.5 kΩ or more)). Otherwise, at the end of the next harvest cycle.
After the delay, all components de-energize. DV energizes after 2 seconds. The water
tank drains for a maximum of 5 minutes or until F/S opens. DV then de-energizes.
When BC closes again calling for ice, the unit starts at the 1-minute ll cycle. There is a
90-second minimum off time before the icemaker can restart.
Legend: BC–bin control; CB–control board; Comp–compressor; CR–compressor relay;
DV–drain valve; FM–fan motor; FS–oat switch; HGV–hot gas valve;
HPS–high-pressure switch; PM–pump motor; TXV–thermostatic expansion valve;
WRV–water regulating Valve; WV–inlet water valve