Hoshizaki KMS1122MLH Service Manual

Hoshizaki America, Inc.

Hoshizaki

Modular Crescent Cuber
Serenity Series

Model

KMS-1122MLH with SRK-12H/3

“A Superior Degree

of Reliability”

www.hoshizaki.com

SERVICE MANUAL

Number: 73194
Issued: 4-4-2013

WARNING

Only qualied service technicians should install and service the appliance. To
obtain the name and phone number of your local Hoshizaki Certied Service
Representative, visit www.hoshizaki.com. No service should be undertaken until
the technician has thoroughly read this Service Manual. Failure to service and
maintain the appliance in accordance with this manual will adversely affect safety,
performance, component life, and warranty coverage and may result in costly water
damage. Proper installation is the responsibility of the installer. Product failure or
property damage due to improper installation is not covered under warranty.

Hoshizaki provides this manual primarily to assist qualied service technicians in the
service of the appliance.

Should the reader have any questions or concerns which have not been satisfactorily
addressed, please call, send an e-mail message, or write to the Hoshizaki Technical
Support Department for assistance.

Phone: [phone]
Fax: [phone]

E-mail: [e-mail]

HOSHIZAKI AMERICA, INC.
618 Highway 74 South
Peachtree City, GA 30269
Attn: Hoshizaki Technical Support Department

Web Site: www.hoshizaki.com

NOTE: To expedite assistance, all correspondence/communication MUST include the

following information:

• Model Number

• Serial Number

• Complete and detailed explanation of the problem.

2

IMPORTANT

This manual should be read carefully before the appliance is serviced. Read
the warnings and guidelines contained in this manual carefully as they provide
essential information for the continued safe use, service, and maintenance of the
appliance. Retain this manual for any further reference that may be necessary.

CONTENTS

Important Safety Information ................................................................................................. 5

I. Construction and Water/Refrigeration Circuit Diagrams ..................................................... 7

A. Construction ................................................................................................................. 7

1. Icemaker ................................................................................................................. 7

2. Condensing Unit ..................................................................................................... 8

B. Water/Refrigeration Circuit Diagram .............................................................................. 9

II. Sequence of Operation and Service Diagnosis ............................................................... 10

A. Sequence of Operation Flow Chart ............................................................................. 10

B. Service Diagnosis ........................................................................................................11

C. Control Board Check ................................................................................................... 16

D. Bin Control Check ....................................................................................................... 17

E. Float Switch Check and Cleaning ............................................................................... 17

F. Thermistor Check ......................................................................................................... 20

G. Diagnostic Tables ........................................................................................................ 21

III. Controls and Adjustments ............................................................................................... 25

A. Control Board Layout .................................................................................................. 26

B. LED Lights and Audible Alarm Safeties ....................................................................... 27

C. Settings and Adjustments ............................................................................................ 28

1. Default Dip Switch Settings .................................................................................... 28

2. Harvest Timer (S4 dip switch 1 & 2) ...................................................................... 29

3. Pump-Out Timer (S4 dip switch 3 & 4) .................................................................. 29

4. Pump-Out Frequency Control (S4 dip switch 5 & 6) .............................................. 30

5. Harvest Pump Timer (S4 dip switch 7) .................................................................. 30

6. Factory Use (S4 dip switch 8) ................................................................................ 30

7. Freeze Timer (S4 dip switch 9 & 10) ....................................................................... 31

8. Float Switch Selector (S5 dip switch 1) ................................................................. 31

9. Rell Counter (S5 dip switch 2 through 5) ............................................................. 32

D. Control Switch and Service Switch .............................................................................. 33

IV. Refrigeration Circuit and Component Service Information.............................................. 34

A. Refrigeration Circuit Service Information .................................................................... 34

B. Component Service Information .................................................................................. 37

V. Maintenance .................................................................................................................... 38

VI. Preparing the Appliance for Periods of Non-Use ............................................................ 39

VII. Disposal ......................................................................................................................... 40

3

VIII. Technical Information .................................................................................................... 41

A. Specication Sheets.................................................................................................... 41

1. KMS-1122MLH with SRK-12H ................................................................................ 41

2. KMS-1122MLH with SRK-12H3 ............................................................................. 42

3. SRK-12H................................................................................................................ 43

4. SRK-12H3.............................................................................................................. 44

B. Performance Data ....................................................................................................... 45

1. KMS-1122MLH with SRK-12H ................................................................................ 45

2. KMS-1122MLH with SRK-12H3 ............................................................................. 46

C. Wiring Diagrams .......................................................................................................... 47

1. Wire Harness Connections ..................................................................................... 47

2. KMS-1122MLH with SRK-12H ............................................................................... 48

3. KMS-1122MLH with SRK-12H3 ............................................................................. 49

4

Important Safety Information

Throughout this manual, notices appear to bring your attention to situations which could
result in death, serious injury, damage to the appliance, or damage to property.

WARNING Indicates a hazardous situation which could result in death or

serious injury.

NOTICE Indicates a situation which could result in damage to the

appliance or property.

IMPORTANT Indicates important information about the use and care of the

appliance.

WARNING

The appliance should be destined only to the use for which it has been expressly
conceived. Any other use should be considered improper and therefore dangerous.
The manufacturer cannot be held responsible for injury or damage resulting from
improper, incorrect, and unreasonable use. Failure to service and maintain the
appliance in accordance with this manual will adversely affect safety, performance,
component life, and warranty coverage and may result in costly water damage.

To reduce the risk of death, electric shock, serious injury, or re, follow basic
precautions including the following:

• Only qualied service technicians should install and service the appliance.

• The appliance must be installed in accordance with applicable national, state, and

local codes and regulations. Failure to meet these code requirements could result in
death, electric shock, serious injury, re, or damage to the appliance.

• To reduce the risk of electric shock, do not touch the control switch or service switch

with damp hands.

• Before servicing the KMS or SRK: Move the KMS control switch to the "OFF"

position and turn off the power supply to the SRK condensing unit. Place the KMS

disconnect (if applicable) in the "OFF" position. Lockout/Tagout to prevent the power

supply from being turned back on inadvertently.

• Do not make any alterations to the appliance. Alterations could result in electric

shock, injury, re, or damage to the appliance.

• The appliance is not intended for use by persons (including children) with reduced

physical, sensory, or mental capabilities, or lack of experience and knowledge,
unless they have been given supervision or instruction concerning use of the
appliance by a person responsible for their safety.

• Children should be properly supervised around the appliance.

• Do not climb, stand, or hang on the appliance or allow children or animals to do so.

Serious injury could occur or the appliance could be damaged.

• Do not use combustible spray or place volatile or ammable substances near the

appliance. They might catch re.

• Keep the area around the appliance clean. Dirt, dust, or insects in the appliance

could cause harm to individuals or damage to the appliance.

5

WARNING, continued

• Power supply and ground connection are supplied from the SRK remote condensing

For KMS

• Risk of electric shock. Control switch in "OFF" position does not de-energize all

loads.

unit via the wire harness provided. Do not connect the wire harness leads to an
external power source.

• Wire harness routing (conduit) and disconnect (if required) must meet national,

state, and local electrical code requirements. Failure to meet these code
requirements could result in death, electric shock, serious injury, re, or damage to
the appliance.

• THE ICEMAKER MUST BE GROUNDED. Failure to properly ground the icemaker
could result in death, serious injury, or damage to the appliance.

For SRK

• Electrical connection must be hard-wired and must meet national, state, and local

electrical code requirements. Failure to meet these code requirements could result
in death, electric shock, serious injury, re, or damage to the appliance.

• The remote condensing unit requires an independent power supply of proper

capacity. See the nameplate for electrical specications. Failure to use an
independent power supply of proper capacity can result in a tripped breaker, blown
fuses, damage to existing wiring, or component failure. This could lead to heat
generation or re.

• THE REMOTE CONDENSING UNIT MUST BE GROUNDED. Failure to properly
ground the remote condensing unit could result in death, serious injury, or damage
to the appliance.

NOTICE

• Follow the instructions in this manual carefully to reduce the risk of costly water

damage.

• In areas where water damage is a concern, install in a contained area with a oor

drain.

• Install the appliance in a location that stays above freezing. Normal operating

ambient temperature must be within 45°F to 100°F (7°C to 38°C).

• Do not leave the appliance on during extended periods of non-use, extended

absences, or in sub-freezing temperatures. To properly prepare the appliance for

these occasions, follow the instructions in "VI. Preparing the Appliance for Periods
of Non-Use."

• Do not place objects on top of the appliance.

• The dispenser unit/ice storage bin is for ice use only. Do not store anything else in

the dispenser unit/ice storage bin.

6

I. Construction and Water/Refrigeration Circuit Diagrams

A. Construction

1. Icemaker

Hot Gas Valve

Thermostatic Expansion Valve

Inlet Water Valve

Cleaning Valve

Thermistor

Drain Valve

Drier

Pump Motor

Float Switch

Evaporator

X12 Relay
(drain valve relay)

X10 Relay
(pump motor relay)

X11 Relay
(inlet water valve relay)

Control Board

Control Box

Liquid Line Valve

Bin Control
Thermostat

Fuse

Bin Control
Insulation

Bin Control Cover

Bin Control Bracket

Bin Control Bulb Holder

7

Service Switch

Control Switch

2. Condensing Unit

Liquid Line Valve

Condenser

Hot Gas Valve

Headmaster

Shut-off Valve
(Low Side)

Magnetic
Contactor

Control Box

Junction Box

Start Relay

Fuse

Capacitors

Fan Motors and Fan Blades

Shut-off Valve (High Side)

Receiver

Accumulator

Compressor

Discharge Line Thermostat

Model Shown: SRK-12H

Crankcase Heater

8

B. Water/Refrigeration Circuit Diagram

Strainer

SRK-12H/3

Condenser

Fans

Headmaster

Receiver

Val ve

Strainer

Suction

Line

Discharge Line

Thermostat

Discharge

Line

Compressor

Accumulator

Liquid Line

High-Pressure

Hot Gas Valve

Check Valve

Switch

Shutoff

Valves

OS Quick

KMS-1122MLH

Water Supply

Hot Gas

Val ve

Cleaning Valve

Drain Valve

Inlet Water

Val ve

Spray Tube

Strainer

Drier

Liquid Line

Val ve

Check

Valves

Heat Exchanger

Thermistor

Thermostatic Expansion Valves

Pump Motor

Water Tank

Drain

Evaporator

Float Switch

9

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

Factory set forevery

10th cycle.

(S4 dip switch 5 & 6)

4. Pump-Out Cycle

FS in control

Comp continues

FMRs continue

HGVs energized

DV & PM de-energized

2 sec., then

energized for

10/20sec.

LLVs de-energized

FS opens or freeze

timer terminates

"G" Control Board Sequence Flow Chart

KMS-1122MLH with SRK-12H/3

3. Freeze Cycle

2. Harvest Cycle

• Minimum freeze time: 5 min.

• Maximum freeze time: freeze timer

(S4 dip switch 7), whichever is shorter.

• WV time: 6 min. or the length of harvest minus 50 sec.

setting (S4 dip switch 9 & 10).

• Maximum harvest time: 20 min.

5-min. minimum

freeze timer in

1 to 3-min. harvest timer in control

(S4 dip switch 1 & 2)

Thermistor

in control

control

HarvestPump

Timer

FS closed

50 sec.

FS closed

To 1 above

Comp continues

FMRs continue

PM continues

LLVs energized

HGVs de-energized

FS check

PM energized

WV de-energized

Comp energized

FMRs energized

Thermistor temperature reaches

48°F (9°C) (3.9 kΩ or less).

Harvest timer starts (1 to 3 min.).

HGVs energized

WV energized

FS open

3. Ice Level Lowered

2. Icemaker Off

No ice touching

thermostatic bulb.

Icemaker starts at

"1. 1-Minute Fill Cycle."

BC closed

Note: CB green "BC CLOSED" LED on

continuously when K4 jumper is in place.

Power is supplied to the pump and drain valve. This drains the water tank.

Power is supplied to the pump only. This operation can be used to circulate cleaner and

sanitizer over the outside surface of the evaporator for extended periods of time.

Power is supplied to the pump and cleaning valve. This operation is used to circulate cleaner

and sanitizer over both the inside and outside surfaces of the evaporator.

All components

de-energized.

BC open

All components

de-energized

DRAIN

CIRCULATE

Components Energized when the Control Switch is in the "SERVICE" Position

When in the "SERVICE" position, the control switch supplies power to the service switch and the icemaker is in service mode.

The service switch has three positions: "DRAIN," "CIRCULATE," and "WASH." See the information below for details of each

function.

WASH

Within 10 sec. after ice

contacts thermostatic

bulb, appliance shuts

FS check

1. 1-Minute

Fill Cycle

Cycle

Steps

Startup

WV energized

FS open

If FS is open, Comp stops and cycle returns to 1-min. ll.

1. Bin Full

Shutdown

down.

Ice contacts

thermostatic bulb

andRestart

BC Operation

Legend:

BC-bin control

Comp-compressor

DV-drain valve

FMRs-fan motors-remote

FS-oat switch

HGVs-hot gas valves (KMS and SRK)

LLVs-liquid line valves (KMS and SRK)

PM-pump motor

WV-inlet water valve

10

B. Service Diagnosis

WARNING

• The appliance should be diagnosed and repaired only by qualied service

personnel to reduce the risk of death, electric shock, serious injury, or re.

• Risk of electric shock. Use extreme caution and exercise safe electrical practices.

• Risk of electric shock. Control switch (KMS) in "OFF" position does not

de-energize all loads.

• Moving parts (e.g., fan blade) can crush and cut. Keep hands clear.

• CHOKING HAZARD: Ensure all components, fasteners, and thumbscrews are

securely in place after the appliance is serviced. Make sure that none have fallen
into the dispenser unit/ice storage bin.

• Make sure all food zones in the icemaker and dispenser unit/ice storage bin are

clean after service.

1. Diagnostic Procedure

The diagnostic procedure is a sequence check that allows you to diagnose the electrical
system and components. Before proceeding, check for correct installation, proper voltage
per nameplate, and adequate water supply.

Note: • When checking high voltage (115VAC), always choose a neutral (W) to establish

a good neutral connection.

• On 3-phase models, the neutral (W) is provided through MT. To conrm a good

neutral (W), check for 60VAC from neutral (W) to ground (GND). If 60VAC is
present, neutral (W) is good. If 60VAC is not present, check 208-230VAC main
power supply to MT. If 208-230VAC is present, check MT continuity.

• When checking voltage from the CB K1 connector (10 pin connector), pull CB

K1connector out slightly to allow room for multimeter test leads contact.

1) Turn off the power supply, then access the control box. Clear any ice from BC.

2) Check that the 115VAC 10A fuses in the KMS and SRK are good.

11

3) Power On: Turn on the power supply, then move the control switch (KMS) to the "ICE"

position. A5-sec. delay occurs. CB red "POWER OK" LED and green "BC CLOSED"

LED turnon.

Note: • CB red "POWER" LED remains on unless the 10.5VAC power supply is

interrupted (K2 connector). CB green "BC CLOSED" LED remains on unless CB

black K4 jumper is loose or removed.

• Check CB using the steps in "II.C. Control Board Check."

Power On Diagnosis: If CB red "POWER OK" LED is off, conrm BC is closed, then

check for 10.5VAC at CB K2connector red wire to red wire. If 10.5VAC is not present,
check for 115VAC at CT, then at control switch. If 115VAC is not present at the control
switch, check that the wire harness is securely connected to KMS and SRK. Check
for 115VAC at terminal block #1 (BR) to a neutral (W). If 115VAC is present check BC
continuity. If 115VAC is not present, check that the SRK HPS and DLT are closed. If

open, see HPS or DLT diagnosis below. If CB red "POWER OK" LED is on, conrm
CB green "BC CLOSED" LED is on. If not, conrm that the jumper required on CB red
K4 connector is in place and securely attached. If CB yellow "BC OPEN" LED is on

with required jumper in place, replace CB.
HPS Diagnosis: Check that the condenser coil is not clogged or restricted. Check that
there are no restrictions in the refrigeration circuit (TXV and drier). Let refrigeration
circuit pressures equalize. If HPS does not reset and pressures are equalized, replace
HPS. If pressures are not equalized, reclaim refrigerant and diagnose refrigeration
circuit restriction.
DLT Diagnosis: Allow time for DLT to cool and reset. If DLT does not reset, replace
D LT.

Conrm that the location meets factory requirements:

• The appliance is not intended for outdoor use. Normal operating ambient temperature

should be within 45°F to 100°F (7°C to 38°C).

• The appliance should not be located in a corrosive environment.

4) 1-Minute Fill Cycle – LED 4 is on. WV and X11 relay energize. After 1 min., CB checks
for a closed FS. If FS is closed, the harvest cycle begins. If harvest cycle begins (Comp
energized), continue to step 4. If FS is open, WV remains energized through additional
1-min. ll cycles until water enters the water tank and FS closes (low water safety
protection during initial start up and at the end of each harvest). Diagnosis: Check that
water enters the water tank. If not, check that the water supply line shut-off valve is open

and screens or external lters are clear. Conrm that FS is open, see "II.E. Float Switch
Check and Cleaning." If FS is open, LED 4 is off, and "POWER OK" LED is on, check

for 115VAC at CB K1 connector pin #6 (O) to a neutral (W). If 115VAC is not present,
replace CB. If LED 4 is on and 115VAC is present, check for 115VAC at WV solenoid. If
115VAC is present, check WV solenoid continuity. If the water tank lls, but the icemaker

fails to start harvest (Comp energized), check for open FS. See "II.E. Float Switch
Check and Cleaning." If FS is closed and CB fails to start the harvest cycle after 1 min.,

replace CB.

12

5) Initial Harvest Cycle – LEDs 1, 4, and 2 are on. WV and X11 relay continue. Comp,
FMRs, HGVs, and X10 relay energize. CBmonitors the warming of the evaporator via
the thermistor located on the suction line. When the thermistor reaches 48°F (9°C), CB
reads 3.9 kΩ from the thermistor and turns harvest termination over to the harvest timer
(S4 dip switch 1 & 2). The harvest timer has settings of 60, 90, 120, and 180 sec. The
pump-out timer (S4 dip switch 3 & 4) acts in place of the harvest timer during cycles
with a pump-out (S4 dip switch 5 & 6). WV and X11 relay are energized during harvest
for a maximum of 6 min. or the length of harvest minus 50sec., whichever is shorter.
50sec. before the harvest timer terminates, harvest pump timer starts. LED 4 turns off,
WV and X11 relay de-energize.

Harvest Pump Timer – LEDs 1, 3, and 2 are on. Comp, FMRs, HGVs, and X10relay
continue. LED 3 turns on and PM energizes for the last 50sec. of harvest (S4 dip
switch 7). WV and X11 relay de-energize.

NOTICE! S4 dip switch 7 must remain in the factory default position of 7 on.
Otherwise, PM will not energize during the last 50 sec. of harvest. The minimum

total time allowed by CB for a complete harvest cycle is 2 min.. At the end of harvest,
CB checks the position of FS and proceeds to the next cycle if it is closed, or calls for a
1-min. ll cycle if it is open.

a) Comp, FMRs, HGVs, and LLVs Diagnosis: Check that evaporator is warming.

Ifnot, conrm that Comp is energized. If not, check for 115VAC at CB K1 connector
pin #1 or #9 (V) to a neutral (W). If 115VAC is not present, check wire harness
connection. If wire harness is loose, reconnect. If 115VAC is present, check for
115VAC at MC coil. If 115VAC is present, conrm MC contacts are closed. If not,
replace MC. If MC contacts are closed, check Comp motor windings. If FMRs are not
energized and MC is energized, check FMRs motor windings and fan blades turns
freely. If Comp is energized and evaporator is not warming, check that HGVs are
open. Check for 115VAC at CB K1connector pin #2 (P) to a neutral (W). If115VAC
is present, check coil voltage and continuity of both KMS and SRK HGVs. Replace
as needed. Conrm that both LLVs (KMS and SRK) are de-energized and closed.
If evaporator is warming, place a thermometer on the suction line next to the
thermistor. Has it warmed to 48°F (9°C) or warmer? Conrm thermistor status. See

"II.F. Thermistor Check." If thermistor is in range, harvest pump timer should start.

b) PM Diagnosis: Conrm WV de-energizes, LED 4 turns off, PM energizes, and

LED 3 turns on 50 sec. before harvest cycle terminates. If not, conrm S4 dip
switch 7 is in the on position. Check for 115VAC at CB K1 connector pin #6 (O).
If115VAC is present, and LED 4 is off, replace CB. Check that LED3turns on and
PM is energized for the last 50 sec. of harvest cycle. If LED 3is on and PM is not
energized, check for 115VAC at CB K1 connector pin #5(DBU). If 115VAC is present
and PM is not energized, check for 115VAC at X10relay coil. If 115VAC is present,
check for 115VAC at X10 relay terminal #4 (R) to a neutral (W). If 115VAC is not
present, check X10 relay coil continuity and contact continuity. If 115VAC is present,
check control switch contact continuity between terminals #6 (R) and #5(R).
Ifcontacts are open, replace control switch. If contacts are closed and 115VAC is
present between control switch terminal #5 (R) and neutral (W), check PM capacitor
and motor winding continuity. If the thermistor reading is in proper range and CB fails
to terminate the harvest cycle, replace CB. If 1-min. ll cycle starts after harvest, see

"II.E. Float Switch Check and Cleaning."

13

6) Freeze Cycle – LED 1 is on. Comp, FMRs, and PM continue. LLVs energize. HGVs and
X10 relay de-energize. The appliance is held in freeze by a 5-min. short cycle protection
timer. When FS opens, the freeze cycle terminates.
Note: CBK1connector pin #5(DBU) de-energizes and K1 connector pin #4 (R)

energizes to prevent PM interruption.

Freeze Cycle Diagnosis: During the rst 5 min. of freeze, conrm evaporator is

cooling. If not, conrm LLVs energize and HGVs de-energize (not bypassing). If LLVs
do not energize, check for 115VAC at CB K1 connector pin #3 (BK) to a neutral (W).
If 115VAC is present, check coil voltage and continuity of both LLVs (KMSand SRK).
Conrm that both HGVs (KMS and SRK) are de-energized and closed. If evaporator is
still not cooling, check TXVsand HM for proper operation. Check for proper appliance

pressures or an inefficient Comp. See "VIII.B. Performance Data." If PM de-energizes

once freeze begins, check for 115VAC at CB K1 connector pin #4(R) to a neutral (W).
If115VAC is not present, replace CB.
Freeze Termination Diagnosis: Disconnect CB black K5 connector. When 5 or more
min. have elapsed in the freeze cycle, the appliance should switch out of freeze. After
the appliance switches out of freeze, reconnect CB black K5 connector. If the appliance

remains in freeze with FS disconnected, replace CB. To check FS, see "II.E. Float
Switch Check and Cleaning." If water tank is empty before 5 min. timer terminates and
freeze cycle is short, check that DV is not leaking by or energized (water owing down

the potable drain). If DV is energized, check X12 relay terminal #4 (GY) for 115VAC.
If115VAC is present, and LED 1 is on, replace CB.

Note: Normal freeze cycle will last 30 to 35 min. depending on model and conditions.

Cycle times and pressures should follow performance data provided in this

manual. See "VIII.B. Performance Data."

14

7) Pump-Out Cycle – LEDs 1, 3, and 2 are on (10/20 second pump-out) –
At the factory setting the 1st pump-out occurs after the 11th freeze cycle, then every
10th cycle thereafter. See the table below.

S4 Dip Switch Setting

No. 5 No. 6

OFF OFF Every cycle After 2nd freeze cycle

ON OFF Every 2 cycles After 3rd freeze cycle

OFF ON Every 5 cycles After 6th freeze cycle

ON ON Every 10 cycles After 11th freeze cycle

Pump-Out

Frequency

1st Pump-Out

Comp and FMRs remain energized. HGVs energize. LLVs de-energize. PM
de-energizes for 2 sec., then PM and DV energize for 10sec.
The pump-out removes contaminants from the water tank through DV.
PM Diagnosis: In the freeze cycle before pump-out (see table above), disconnect CB
black K5connector (FS connector) after 5 min. of freeze. If PM does not energize after
2 sec., check that CB LEDs 1, 3, and 2are on. If not, replace CB. If LED 1, 3, and
2 are on and PM does not energize, check for 115VAC at CB K1connector pin
#5(DBU) to a neutral (W). If LED 3 is on and 115VAC is not present, replace CB.
If 115VAC is present, check for 115VAC at X10 relay terminal #2 (DBU) to a
neutral(W). If 115VAC is not present, replace X10relay. If 115VAC is present, check for
115VAC at X12 relay, terminal #7 (DBU) to a neutral (W). If 115VAC is present, and PM
is not energized, check X12 relay coil continuity. If open, replace X12 relay. If 115VAC
is present, check for 115VAC at X12 relay terminal #3 (R) to a neutral (W). If 115VAC
is not present, conrm 115VAC at X12 relay terminal #5 (BR) to a neutral. If 115VAC is
present on terminal #5 (BR) but not on terminal #3 (R), replace X12 relay. If 115VAC is
not present on terminal #5 (BR), check all (BR) connections. Next, check PM capacitor
and PM windings. DV Diagnosis: If water does not pump out, check for 115VAC at
X12 relay terminal #4 (GY) to a neutral (W). If 115VAC is not present, conrm 115VAC
at X12 relay terminal #6 (DBU). If 115VAC is present on X12 relay terminal #6 (DBU)
and not on X12 relay terminal #4 (GY), replace X12 relay. If 115VAC is present on
X12relay terminal #4 (GY), check DV coil continuity. If open, replace DV. Next, remove
DV housing and check/clean DV assembly. Make sure the drain line is not clogged.

8) Normal Harvest Cycle – Same as the initial harvest cycle. Return to step 5.
Note: Icemaker continues to cycle until BC is satised or power is switched off. The

appliance always restarts at the 1-min. ll cycle.

9) Shutdown–When the appliance is running hold ice in contact with the thermostatic
bulb. BC switch opens within 10 sec., shutting down the appliance. BC is factory set,
and generally no adjustment is required. However, adjustment may be needed in some
conditions, particularly at higher altitude locations. Diagnosis: See "II.D. Bin Control

Check."

Legend: BC–bin control; CB–control board; Comp–compressor; CT–control transformer;

DLT–discharge line thermostat; DV–drain valve; FMRs–fan motors-remote;
FS–oat switch; HGVs–hot gas valves; HM–headmaster; HPS–high-pressure
switch; LLVs–liquid line valves; MC–magnetic contactor; MT–main transformer;
PM–pump motor; TXVs–thermostatic expansion valves; WV–inlet water valve;
X10–pump motor relay; X11 –inlet water valve relay; X12–drain valve relay

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