Service Manual

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d) PM Diagnosis: Check for 115VAC at X12 relay #6 (DBU) to neutral(W). If 115VAC
is not present, see "b) CB Diagnosis" above. Next, check for 115VAC at X12 relay
#4(W/R) to neutral (W). If 115VAC is not present, conrm X12 relay is energized.
If X12 relay is de-energized, see "c) X12 Relay Diagnosis:" above. If X12 relay
is energized and 115VAC is present at X12 relay #6 (DBU) and not at X12 relay
#4(W/R), replace X12 relay. If 115VAC is present at X12 relay #4 (W/R) and PM is
de-energized, check PM capacitor, motor winding, wiring connections, and impeller
for binding.
e) DV Diagnosis: Check for 115VAC at X12 relay #5 (DBU) to neutral (W) and at
X12relay #3 (GY) to neutral (W). If 115VAC is not present at X12 relay #5 (DBU),
see "b) CB Diagnosis:" above. If 115VAC is present at X12 relay #5 (DBU) and not
at X12 relay #3(GY), conrm X12 relay is energized. If X12 relay is de-energized,
see "c) X12 Relay Diagnosis:" above. If X12 relay is energized and 115VAC is
present at X12 relay #5 (DBU) and not at X12 relay #3 (GY), replace X12 relay.
If115VAC is present at X12 #3 (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 yellow "BC OPEN" LED comes on. The icemaker
then shuts down as outlined in the table below.
Cycle at Bin
Control Activation
Shutdown
Fill Cycle 15 seconds after activation.
Harvest Cycle At the end of the harvest cycle, or up to 15 seconds into the freeze cycle if activated
at the end of the harvest cycle.
Freeze Cycle 15 seconds after activation if activated at least 15 seconds before the 5-minute short
cycle protection timer terminates. Otherwise, at the end of the next harvest cycle.
3. Freeze-Time Correction Cycle Diagnosis
1) See "II.C. Freeze-Time Correction Cycle (90 min.)."
Legend: BC–bin control; CB–control board; Comp–compressor; CT–control transformer;
CV–cleaning valve; DV–drain valve; FMRs–fan motor remote; FS–oat switch;
HGVs–hot gas valves; HM–headmaster (C.P.R.); HPS–high-pressure switch;
LLVs–liquid line valves; MC–magnetic contactor: MT–main transformer;
PM–pump motor; TXV–thermostatic expansion valve; WV–inlet water valve