Hoshizaki FD-1001MLH(-C) Service Manual page 60

7) Ice Purge Cycle – "GM" LED is on. 30-second GM delay timer and 30-minute freeze
timer start. WV de-energizes and "WTRIN" LED turns off. Once the 30-second GM
delay timer terminates, the 5-minute ice purge timer starts. GMR (X2 on CB), GM,
GMPR, FM/FMR, and EHH (-C model only) energize. Diagnosis: If "GM" LED is off,
check that WV de-energizes and UF/S closes. If "GM" LED is on and GM is off, confirm
115VAC at CB K1 connector pin #3 black (BK) to white (W) neutral. Check for 115VAC
at CB K1 connector pin #2 brown (BR) to a white (W) neutral. If no voltage is present,
CB is bad and must be replaced. If 115VAC is present, check GM fuse, thermal
protector, and GM windings. If FM/FMR is on but GM is off, check GM capacitor,
GM windings, and GM coupling between auger and GM. If FM/FMR does not start,
check FM/FMR capacitor, FM/FMR windings, and FM/FMR bearings.
8) Freeze Cycle – "COMP" LED is on. "GM" LED remains on. Comp, LLV (MLH model),
and SLV (MLH model) energize. GMR (X2 on CB), GM, GMPR, and FM/FMR continue.
Ice production begins 4 to 6 minutes after Comp, LLV (MLH model), and SLV (MLH
model) energize depending on ambient and water conditions. Diagnosis: Check
that "COMP" LED is on and that Comp, or LLV (MLH model) and SLV (MLH model),
energize. If "COMP" LED is off, check DC voltage across GMPR terminals 3 and
5 white/orange (W/O) wires. If 5VDC is present, GMPR contacts are open. Check
GMPR solenoid voltage and solenoid continuity. Replace GMPR if necessary. If
"COMP" LED remains off, CB is bad and must be replaced. If "COMP" LED is on and
Comp is off, check for 115VAC at CB X1 Comp relay, Comp, LLV (MLH model), and
SLV (MLH model). Check Comp internal overload (motor protector), start relay, and
capacitors.
9) Refill Cycle/Low Water Safety Cycle – As ice is produced, the water level in the
reservoir drops. UF/S opens. Nothing occurs at this time. When LF/S opens, WV
energizes, 90-second low water safety timer (fill timer) starts. Comp, GMR, GM, GMPR,
and FM/FMR continue. When UF/S closes, WV de-energizes, 90-second low water
safety timer (fill timer) terminates and 30-minute freeze timer resets.
If UF/S remains open 90 seconds after WV energizes (fill timer exceeded), a 90-second
shutdown cycle starts. Comp de-energizes and CB signals a 1-beep alarm every
5 seconds. 90-second purge timer starts. GMR, GM, GMPR, and FM/FMR continue to
clear ice from the evaporator. 90-second purge timer terminates, GMR, GM, GMPR,
and FM/FMR de-energize. WV and 1-beep alarm continue until UF/S closes.
Diagnosis – Check that "WTRIN" LED is on. If not, check LF/S. See "IV.E. Float
Switch Check and Cleaning." If LF/S is open and "WTRIN" LED is off, CB is bad and
must be replaced. If "WTRIN" LED is on, check that the reservoir fills. If not, check
the water supply line, clogged water filters, WV solenoid, clogged WV screen. If WV
is energized and refill exceeds 90-second low water safety timer (fill timer), check DV
leaking by, UF/S open. See "IV.E. Float Switch Check and Cleaning."
Note: Each time UF/S closes, 30-minute freeze timer starts. The 30-minute freeze timer
resets when UF/S closes again. If UF/S does not close again within 30 minutes,
CB shuts down the unit and sounds a 5-beep alarm every 5 seconds. See "II.
C.3.d) Freeze Timer (5-beep alarm)."
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