Control Board Check; Bin Control Check - Hoshizaki F-330BAH Service Manual

C. Control Board Check
Before replacing a control board 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.
1) Startup: Move the power switch to the "OFF" position, then unplug the appliance.
Access CB and remove the wires from CB #3, 4, 5, 6, 10, and 11. Plug the appliance
back in. Confirm the flush/control switch is in the "ICE" position, then move the power
switch to the "ON" position. Check for 24VAC at CB #1 (W/R) to CB #2 (LBU). If 24VAC
is not present, see "II.B.2. Diagnostic Procedure." If 24VAC is present, check for 35VDC
at CB #3 to CB #4, CB #5 to CB #6, and CB #10 to #11. If 35VDC is not present on a
circuit, replace CB.
2) Move the power switch to the "OFF" position, then unplug the appliance. Reconnect the
wires to their correct positions on CB. Plug the appliance into the electrical outlet, then
move the power switch to the "ON" position. Relay Diagnosis: Once UFS closes, relay
energizes (X4 (C-0 and earlier) or X11 (C-1 and later)). CB #3 (BR) and CB #4 (DBU)
close, CB #7 (BR) and CB #8 (W/BR) close (GM energizes). If not, replace CB. Once
GM energizes, X3 (C-0 and earlier) or X12 (C-1 and later) relay energizes, closing CB
#10 (W/BK) and CB #11 (W/O) circuit and starting 90-sec. Comp delay timer. When
90-sec. Comp delay timer terminates, CB X2 relay energizes, energizing Comp. If not,
replace CB.
Legend: CB–control board; Comp–compressor; GM–gear motor; UFS–upper float switch;
X4 (C-0 and earlier) or X11 (C-1 and later)–water control relay;
X3 (C-0 and earlier) or X12 (C-1 and later)–compresser delay relay
D. Bin Control Check
1) Remove the front, top, and rear panels.
2) Move the power switch to the "OFF" position.
3) Unplug the appliance from the electrical outlet.
4) Disconnect the BC connector located at the back of the appliance.
5) Move ice away from the BC actuator in the bin.
6) Check continuity across BC connector terminals. If BC actuator is not engaged, BC is
closed. If not, replace BC.
7) Press and hold BC actuator paddle located at the top of the ice storage bin. While BC
actuator is engaged, check continuity across BC. If BC actuator is engaged, BC is open.
If not, replace BC.
8) Reconnect BC connector.
9) Plug the appliance into the electrical outlet, then move the power switch to the "ON"
position. Confirm the flush/control switch is in the "ICE" position to start the automatic
icemaking process.
Legend: BC–bin control
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