Hoshizaki F-330BAH Service Manual page 17

8) 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
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