Hoshizaki F-330BAH Service Manual page 13

4) Startup/Fill Cycle–Move any ice away from the BC actuator paddle (located at the
top of the bin). Move the flush switch to the "ICE" position. X5 relay and WV energize.
Reservoir fills, LFS closes, nothing happens at this time. The reservoir continues to fill.
X5 Relay Diagnosis: Check that WV energizes and fills the reservoir. If not, confirm BC
is closed. See "II.D. Bin Control Check." Confirm flush switch is in the "ICE" position and
switch is closed. Next, check for 24VAC at X5 #7 (V) to X5 relay #8 (LBU). If 24VAC is
present, check for 24VAC at X5 relay #5 (W/R) to neutral (LBU) and at #3 (R) to neutral
(LBU). If 24VAC is present at #5 (W/R) and not at #3 (R), replace X5 relay. If 24VAC is
present at X5 relay #3 (R), check X4 relay. X4 Relay Diagnosis: Check for 24VAC at X4
relay #5 (R) to neutral (LBU) and at #1 (O) to neutral (LBU). If 24VAC is present at X11
relay #5 (R) and not at #1 (O), confirm X4 relay is de-energized.
If X4 relay is energized, check for sticking UFS. See "II.E. Float Switch Check and
Cleaning." If X4 relay is de-energized, replace X4 relay. WV Diagnosis: If 24VAC is
present at X4 #1 (O), check WV coil continuity. If open, replace WV.
5) Ice Purge Cycle–UFS closes, X4 relay energizes, WV de-energizes, and low-water
safety circuit (CB #3 and #4) closes. GM and X3 relay energize, 60 sec. Comp delay
timer starts. If HPS is open, CB does not get 24VAC control voltage and 35VDC supply
is not present for low-water safety circuit. HPS Diagnosis: If HPS is open, check that
the condenser air filter and coil are not clogged or restricted. Check that there are no
restrictions in the refrigeration circuit (capillary tube or drier). Let refrigeration circuit
pressures equalize. If HPS does not reset and pressures are equalized, replace HPS.
If pressures are not equalized, reclaim refrigerant and diagnose refrigeration circuit
restriction. X4 Relay Diagnosis: Check for 35VDC at X4 relay #4 (DBU) to #6 (BR).
If 35VDC is present, X4 relay is de-energized or bad. Replace as necessary. If 0VDC
is present, GM energizes. GM Diagnosis: If GM does not energize and 0VDC is read
at CB #3 (BR) to CB #4 (DBU), check for 115VAC at CB #7 (BR) to neutral (W) and CB
#8 (W/BR) to neutral (W). If 115VAC is present on CB #7 (BR) and not on CB
#8 (W/BR), replace CB. If 115VAC is present on CB #8 (W/BR), check GM external
protector and GM winding. If GM starts but the auger does not turn, check coupling
between auger and GM. X3 Relay Diagnosis: X3 relay energizes and starts 60 sec.
Comp delay timer in CB (CB #10 (W/BK) and #11 (W/O)). After 60 sec. timer terminates,
confirm Comp energizes. If not, check for 115VAC at X3 relay #7 (R) to X3 relay #8 (W).
If 115VAC is not present, check GM external protector and GM winding. If 115VAC is
present, check for 35VDC at X3 relay #4 (W/O) to X3 relay #6 (W/BK). If 35VDC is
present, replace X3 relay. If 0VDC is present and Comp does not energize, replace CB.
See "II.C. Control Board Check."
6) Freeze Cycle–GM and X3 relay continue. Comp and FM energize. X4 relay
energizes and de-energizes as needed through LFS/UFS. Ice production begins
4 to 6 minutes after Comp and FM start depending on ambient and water conditions.
Diagnosis: Check that Comp and FM energize. If not, check for 115VAC at CB X2 relay
#4 (BR) to neutral (W) and CB X2 relay #3 (O) to neutral (W). If 115VAC is present at
CB X2 relay #4 (BR) and not at CB X2 relay #3 (O), replace CB. If 115VAC is present at
CB X2 relay #3 (O) and Comp and FM do not energize, for Comp check Comp winding,
start capacitor, and start relay. For FM, check FM windings and fan blade for binding.
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