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Shutdown
–Ice fills ice storage bin and presses BC actuator to open BC. Comp, FM,
GM, and X12 relay continue. X10 relay and X11 relay de-energize. 90 sec. low-water
safety timer starts. When 90 sec. low-water safety timer terminates, Comp and FM
de-energize. GM and X12 relay continue. 60 sec. GM delay timer starts. Once 60
sec. GM delay timer terminates, GM, X12 relay, and EH on -C model de-energize.
DV energizes. Reservoir and evaporator drain. DV remains energized until BC closes
again.
Diagnosis:
Check that BC actuator paddle is activated and not sticking. Confirm BC
is open and X10 relay de-energizes. If not, see "II.D. Bin Control Check." Next, confirm
X11 relay de-energizes. If not, check for 24VAC at X10 relay #3 (R) to neutral (LBU).
If 24VAC is present, replace X10 relay. If X11 relay is de-energized, after 90 sec. confirm
Comp and FM de-energize. If not, check for 35VDC at CB #3 (BR) to CB #4 (DBU).
If 0VDC is present, replace X11 relay. If 35VDC is present and Comp and FM remain
energized, replace CB. 60 sec. after Comp and FM de-energize, confirm that GM and
X12 relay de-energize. If not, replace CB. Next, confirm DV energizes. If not, check for
24VAC at X12 relay #5 (W/R) to neutral (LBU) and X12 relay #1 (V) to neutral (LBU).
If 24VAC is present at X12 relay #5 (W/R) and not at #1 (V), replace X12 relay. If 24VAC
is present at X12 relay #1 (V) and DV is not energized, check for 24VAC at X10 relay
#6 (W/BK) to neutral (LBU) and X10 relay #2 (V) to neutral (LBU). If 24VAC is present
at X10 relay #2 (V) and not at #6 (W/BK), replace X10 relay. If 24VAC is present, check
DV coil continuity and replace as necessary. If DV coil is good, check for crimped drain
hose or clogged drain line.
Legend:
BC–
bin control;
CB–
control board;
Comp–
compressor;
CT–
control transformer;
DV–
drain valve;
FM–
fan motor;
GM–
gear motor;
HPS
–high-pressure switch;
LFS–
lower float switch;
UFS–
upper float switch;
WV–
inlet water valve;
X10–
control relay;
X11–
water control relay;
X12–
compressor delay relay