Hoshizaki Modular Cubelet Serenity Series Service Manual page 16

6) Startup – CB "POWER OK" LED is on. Plug the icemaker back into the electrical
outlet, then move the power switch to the "ON" position. Move the control switch to the
"ICE" position. CB "POWER OK" LED and IS (BC1) green LED turn on.
Diagnosis CB "POWER OK" LED: If CB "POWER OK" LED is off, check for proper
supply voltage (115VAC) input to CT. If 115VAC is not present, check the power switch
and breaker. Next, check for proper 24VAC output voltage from CT. Check CB K8
#1 (W/R) to #2 (LBU) for 24VAC. If 24VAC is not present and 1A 24VAC fuse is
good, replace CT. If 24VAC is present and CB "POWER OK" LED is off, replace CB.
Diagnosis BC1 (infrared sensor): Check that BC1 green LED is on. If CB "POWER
OK" LED is on and BC1 green LED is off, check CB K6 #1 (DBU) to CB K6 #3 (BR)
for 20VDC. If 20VDC is not present, confirm S1 dip switch 7 is in the "ON" position.
If S1 dip switch 7 is in the "ON" position and 20VDC is not present, replace CB.
If BC1 yellow LED is on or flashing, move ice away from lens. If no ice is present, clean
the lens with a warm, clean damp cloth. If BC1 yellow LED is still on or flashing after
cleaning the lens, replace BC1.
Diagnosis BC2 (mechanical backup): CB 9-beep alarm sounds. Confirm spout cover
is properly aligned and secure. Check continuity across BC2. If open, replace BC2.
Next, check 0VDC at CB K8 #3 (GY) to CB K8 #4 (GY). When BC2 is closed 0VDC is
read. Remove spout spring, then open the spout cover slightly to engage BC2. When
open, 5VDC is present between CB K8 #3 (GY) and CB K8 #4 (GY). If 5VDC is not
present when BC2 is open, replace CB. Close the spout cover and replace the spout
spring.
7) Fill Cycle – "WTRIN" LED is on. Reservoir is empty and LFS and UFS are open.
90-sec. FT starts. WV energizes and fill cycle starts. LFS closes. Nothing occurs at this
time. Reservoir continues to fill until UFS closes. When UFS closes, FT terminates,
WV de-energizes, 90-sec. FT is terminated, and CB "WTRIN" LED turns off. 30-min.
FZT and 30-sec. GM delay timer start. If UFS remains open longer than 90 sec. after
LFS opens, FT exceeded and CB sounds a 1-beep alarm. WV remains energized until
UFS closes. Alarm resets automatically when UFS closes.
Diagnosis: If reservoir is empty and "WTRIN" LED is off, confirm LFS status. See
"II.F.1. Float Switch Check."
If LFS is open and "WTRIN" LED is off, replace CB. If "WTRIN" LED is on, check
that the reservoir fills. If not, check water supply line shut-off valve, water filters, and
WV screen. If "WTRIN" LED is on and WV is off, check CB K2 #8 (O) to a neutral
(LBU) for 24VAC. If 24VAC is not present, check CB K2 #9 (W/R) to a neutral (LBU) for
24VAC. If 24VAC is present on CB K2 #9 (W/R) and not on CB K2 #8 (O), replace CB.
If 24VAC is present on CB K2 #8 (O), check continuity through WV solenoid. If open,
replace WV. If WV is energized and refill exceeds FT with no water in the reservoir,
check for DV leaking. If reservoir is full and overflowing check for open UFS.
See "II.F.1. Float Switch Check." If UFS is closed, check that WV de-energizes.
If not, check CB K2 #8 (O) to a neutral (LBU) for 24VAC. If 24VAC is present, replace
CB. If WV de-energizes and water continues to fill the reservoir, replace WV.
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