Hoshizaki DCM-271BAH Service Manual page 12

6) Freeze Cycle – "COMP" LED is on. ice purge timer terminates (1-min. "F-A" CB
E-0 (H) and later and "F-C" CB dip switch 8 off or 5-min. "F-A" CB E-0 (G) and earlier
dip switch 8 on) or the "SERVICE" button is pressed. "COMP" LED turns on. "GM" LED
remains on. Comp and FM energize. GM and CCR continue. Ice production begins
4 to 6 minutes after Comp energizes depending on ambient and water conditions.
Diagnosis Comp: Check that "COMP" LED is on and that Comp energizes. If "COMP"
LED is off, confirm ice purge timer has terminated (1-min. "F-A" CB E-0 (H) and later
and "F-C" CB dip switch 8 off or 5-min. "F-A" CB E-0 (G) and earlier a dip switch 8 on).
Check for 0VDC across CB K9 #3 (W/O) and CB K9 #5 (W/O). If 5VDC is present,
CCR contacts are open. Check for 115VAC at CCR #7 (R) to CCR #8 (W). If 115VAC
is present, check CCR continuity between CCR #3 (W/O) and CCR #5 (W/O). If open,
replace CCR. If closed and "COMP" LED remains off, replace CB. If "COMP" LED is
on and Comp is off, check for 115VAC at CB X1 brown (BR) wire to neutral (W) and CB
X1 red (R) wire to neutral (W). If 115VAC is present on CB X1 brown (BR) wire and not
on CB X1 red (R) wire, replace CB. If 115VAC is present on CB X1 red (R) wire, check
Comp external protector, motor windings, start relay, and capacitors.
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 FM: If FM does not energize, check FM capacitor, motor windings, and
bearings.
7) 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 and FM
de-energize and CB signals a 1-beep alarm every 5 sec. 90-sec. ice purge timer
starts. GM and CCR continue to clear ice from the evaporator. 90-sec. ice purge timer
terminates, 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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