Hoshizaki DCM-271BAH-OS Service Manual page 13

Icemaker Diagnosis (CCR): 5-min. ice purge timer terminates, CB "COMP" LED turns
on and COMP energizes. If not, check for 5VDC between CB K4 connector pin closest
to CB K3 connector and CB K9 connector #5 (W/O). If 5VDC is not present, replace
CB. If 5VDC is present, check for 5VDC between CB K4 connector pin closest to CB
K3 connector and CB K9 connector #6 (W/O). If 5VDC is present and CB "Comp" LED
is off, COMP not energized, replace CB. If 5VDC is not present, check for 115VAC
between CCR terminal #7 (R) to CCR terminal #8 (W) for 115VAC. If 115VAC is not
present, GM not energized, see step 7 above. If 115VAC is present and CCR contacts
are open (5VDC present between terminals #3 (W/O) and #5 (W/O)), check CCR
solenoid continuity. If open, replace CCR.
Note: If CCR de-energizes, CB K9 #5 W/O and CB K9 #6 W/O circuit opens, Comp
de-energizes and an 8-beep alarm occurs. See "III.B. LED Lights and Alarm Safeties."
Diagnosis COMP: If "COMP" LED is on and COMP is not energized, check CB X1
relay BK wire to a neutral (W) and CB X1 relay R wire to a neutral (W) for 115VAC.
If 115VAC is present on CB X1 BK wire and not on CB X1 R wire, replace CB.
If 115VAC is present on CB X1 R wire and COMP is not energized, check Comp
windings (internal protector), start relay, and capacitor.
9) Refill Cycle/Low Water Safety – As ice is produced, the water level in the reservoir
drops. UFS opens. Nothing occurs at this time. When LFS opens, WV energizes,
90-sec. low water safety timer (fill timer) starts. Comp, GM, CCR, and FM continue.
When UFS closes, WV de-energizes, 90-sec. low water safety timer (fill timer)
terminates and 30-min. freeze timer resets. If UFS remains open 90 sec. after WV
energizes (fill timer exceeded), a 90-sec. shutdown cycle starts. Comp de-energizes
and CB signals a 1-beep alarm every 5 sec. 90-sec. ice purge timer starts. FM, GM,
and CCR continue to clear ice from the evaporator. 90-sec. ice purge timer terminates,
FM, GM and CCR de-energize. WV and 1-beep alarm continue until UFS closes.
Diagnosis – Check that "WTRIN" LED is on. If not, check LFS. See "II.E. Float Switch
Check and Cleaning." If LFS is open and "WTRIN" LED is off, replace CB. If "WTRIN"
LED is on, check that the reservoir fills. If not, check the water supply line, restricted
water filters, WV solenoid, restricted WV screen. If WV is energized and refill exceeds
90-sec. low water safety timer (fill timer), check DV leaking by or open UFS.
See "II.E. Float Switch Check and Cleaning."
Note: Each time UFS closes, 30-min. freeze timer starts. The 30-min. freeze timer
resets when UFS closes again. If UFS does not close again within 30 min., CB
shuts down the icemaker and sounds a 5-beep alarm every 5 sec. See "II.B. LED
Lights and Alarm Safeties."
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