Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C User Manual

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c. Mechanical Backup Bin Control (MBC) –K8 connector pins #3 and #4 gray (GY)
wires: When MBC is closed (calling for ice), 5VDC is present from the white
K5 connector pin closest to red K4 connector to the K8 connector pin #3 and #4 gray
(GY) wires. Diagnosis: If 5VDC is not present to either pin, CB is bad and must be
replaced. If 5VDC is present to pin #3 gray (GY) wire and not to pin #4 gray (GY)
wire,MBCisopen.See"IV.D.2.MechanicalBackupBinControlCheck."
d. Float Switch (LF/S and UF/S) –K8 connector pin #5 black (BK) wire (common),
#6red (R) wire (upper), and #7 dark blue (DBU) wire (lower): 5VDC is always
present from the white K5 connector pin closest to red K4 connector to the
K8connector pin #5 black(BK) wire (common). 5VDC is present to the K8 connector
pin #6 red (R) wire (upper) and pin #7 dark blue (DBU) wire (lower) when the F/S
is open. Diagnosis: If 5VDC is not present at K8 connector pin #5 black (BK) wire,
CBisbadandmustbereplaced.ForfurtherF/Sdiagnostics,see"IV.E.FloatSwitch
CheckandCleaning."
5) Fill "WTRIN" LED is on:The"WTRIN"LEDonlyturnsonwhenthereservoirwater
levelislowenoughtoopentheLF/S.The"WTRIN"LEDturnsoffoncetheUF/Scloses.
24VAC is present at CB K2 connector pin #8to any light blue (LBU) wire when LF/S
is open. Diagnosis: IftheLF/Sisopenandthe"WTRIN"LEDisoff,conrmLF/S
status,openorclosed.IfLF/Sisopenand"WTRIN"LEDisoff,CBisbadandshould
bereplaced.If"WTRIN"LEDisonand24VACisnotpresentfromCBconnector
K2connector pin #8 to any light blue (LBU) wire, conrm 24VAC from K2 connector pin
#9to any light blue (LBU) wire. If 24VAC is present on K2 connector pin #9 and not on
K2 connector pin #8, CB is bad and must be replaced.
6) Ice Purge Cycle "GM" LED is on:"GM"LEDison,GMandEHenergize. 
Diagnosis: If"GM"LEDisonandGMandEHareoff,checkfor115VACfromthe
K1 connector pin #2 white/black (BK) wire to a white (W) neutral wire. If 115VAC is not
present, check for 115VAC from CB K1connector pin #3 brown (BR) wire to a white (W)
neutral wire. If 115VAC is present on pin #3 and not on pin #2, CB is bad and should be
replaced.
7) Freeze Cycle "GM" and "COMP" LED are on: To bypass the Ice Purge Cycle,
pressthe"SERVICE"buttononCBafterthe"GM"LEDturnson.WARNING! Risk of
electric shock. Care should be taken not to touch live terminals.When"COMP"
LED is on 115VAC is present at CB X1 relay dark blue (DBU) wire and PDS energizes.
Diagnosis: Check for 115VAC from CB X1 relay dark blue (DBU) wire to a white neutral
wire. If 115VAC is not present, check X1 relay brown (BR) wire to a white neutral wire.
If 115VAC is present on X1 relay brown (BR) wire and not on X1 relay dark blue (DBU)
wire, CB is bad and must be replaced.
8) Rell "WTRIN" LED is on: See"5)Fill"WTRIN"LEDison:")above.
Legend: CB–control board; EH–evaporator heater; F/S–oatswitch;GM–gear motor;
GMPR–gear motor protect relay; IS–infrared sensor; LF/S–loweroatswitch;
MBC–mechanical backup bin control; PDS–pump-down solenoid valve;
UF/S–upperoatswitch;WV–inlet water valve

Hoshizaki MODULAR CUBELET SERENITY SERIES FS-1022MLH-C Specifications

General

Brand	Hoshizaki
Model	MODULAR CUBELET SERENITY SERIES FS-1022MLH-C
Category	Ice Maker
Language	English