Hoshizaki FS1001MLJC User Manual

Service Manual

Modular Cubelet Serenity Series

Models
FS-1001MLJ-C with SRC-10J
FS-1022MLJ-C with SRC-10J
FS-1500MLJ-C with SRC-14J

hoshizakiamerica.com

Number: 73222
Issued: 3-22-2018

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]

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 Diagram ....................................................... 8

A. Construction .................................................................................................................. 8

1. Icemaker .................................................................................................................. 8

2. Condensing Unit ...................................................................................................... 9

3. Icemaking Unit ....................................................................................................... 10

B. Water/Refrigeration Circuit Diagram .............................................................................11

II. Sequence of Operation and Service Diagnosis ............................................................... 12

A. Sequence of Operation Flow Chart ............................................................................. 12

1. Operation Flow Chart ............................................................................................. 12

2. Shutdown Flow Chart ............................................................................................ 13

B. Service Diagnosis ....................................................................................................... 14

C. Control Board Check ................................................................................................... 21

D. Bin Control Check ....................................................................................................... 26

E. Power Switch and Control Switch ................................................................................ 28

1. Power Switch .......................................................................................................... 28

2. Control Switch ........................................................................................................ 28

F. Float Switch Check and Cleaning ................................................................................ 29

G. Diagnostic Tables ........................................................................................................ 31

III. Controls and Adjustments ............................................................................................... 34

A. Control Board .............................................................................................................. 34

1. Control Board Layout ............................................................................................. 35

2. LED Lights and Audible Alarm Safeties ................................................................. 36

3. Ice Purge Cycle Bypass ......................................................................................... 36

B. Controls and Adjustments ........................................................................................... 37

1. Default Dip Switch Settings .................................................................................... 37

2. BC (Infrared Sensor) Shutdown Delay (S1 dip switch 1, 2, 3) .............................. 38

3. Drain Frequency Control (S1 dip switch 4) ............................................................ 38

4. Continuous Dispensing Timer (S1 dip switch 5 & 6) .............................................. 38

5. Bin Control Selector (S1 dip switch 7) ................................................................... 39

6. BC (Mech. Stand-Alone or Backup (only)) Shutdown Delay (S1 dip switch 8) ...... 39

7. Shutdown Sequence (S1 Dip Switch 9) ................................................................. 39

8. Factory Use (S1 Dip Switch 10) ............................................................................. 39

IV. Refrigeration Circuit and Component Service Information.............................................. 40

A. Refrigeration Circuit Service Information .................................................................... 40

B. Component Service Information .................................................................................. 43

V. Maintenance .................................................................................................................... 52

VI. Disposal .......................................................................................................................... 54

3

VII. Technical Information ..................................................................................................... 55

A. Specication and Performance Data Sheets ............................................................... 55

1. FS-1001MLJ-C with SRC-10J ................................................................................ 55

2. FS-1022MLJ-C with SRC-10J ................................................................................ 56

3. FS-1500MLJ-C with SRC-14J ............................................................................... 57

B. Wiring Diagrams .......................................................................................................... 58

1. FS-1001MLJ-C and FS-1022MLJ-C ...................................................................... 58

2. FS-1500MLJ-C ...................................................................................................... 59

3. SRC-10J Condensing Unit .................................................................................... 60

4. SRC-14J Condensing Unit .................................................................................... 61

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.

• The appliance must be installed in accordance with applicable national, state, and
local codes and regulations.

• To reduce the risk of electric shock, do not touch the icemaker power switch or plug
with damp hands. Make sure the icemaker power switch is in the "OFF" position
before plugging in or unplugging the icemaker.

• Before Servicing: FS: Move the icemaker's power switch to the "OFF" position.
Unplug the icemaker from the electrical outlet. SRC: Turn off the power supply
to the remote condensing unit. Place the 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 icemaker or condensing unit. Alterations could
result in electric shock, injury, re, or damage to the appliance.

5

WARNING, continued

FS

• The icemaker 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 fuse, damage to existing
wiring, or component failure. This could lead to heat generation or re.

• THE ICEMAKER MUST BE GROUNDED. The icemaker is equipped with a
NEMA5-15 three-prong grounding plug
hazards. It must be plugged into a properly grounded, independent 3-prong wall
outlet. If the outlet is a 2-prong outlet, it is your personal responsibility to have
a qualied electrician replace it with a properly grounded, independent 3-prong
wall outlet. Do not remove the ground prong from the power cord and do not use
an adapter plug. Failure to properly ground the icemaker could result in death or
serious injury.

• Do not use an extension cord.

• Do not use an icemaker with a damaged power cord. The power cord should not be
altered, jerked, bundled, weighed down, pinched, or tangled. Such actions could
result in electric shock or re. To unplug the icemaker, be sure to pull the plug, not
the cord, and do not jerk the cord.

• Do not place ngers or any other objects into the ice discharge opening.

to reduce the risk of potential shock

SRC

• 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
fuse, damage to existing wiring, or component failure. This could lead to heat
generation or re.

• Electrical connection must be hard-wired to the remote condensing unit 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.

• THE REMOTE CONDENSER UNIT MUST BE GROUNDED. The power supply and
ground connection to the remote condenser unit are supplied from the icemaker.
Failure to properly ground the remote condenser unit could result in death or
serious injury.

• Wire 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.

6

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 icemaker on during extended periods of non-use, extended
absences, or in sub-freezing temperatures. To properly prepare the icemaker for
these occasions, follow the instructions provided in the instruction manual.

• 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.

7

I. Construction and Water/Refrigeration Circuit Diagram

A. Construction

1. Icemaker

Front View

Front Panel

Cutter, Extruding Head,
Evaporator

Evaporator
Heater

Thermostatic
Expansion Valve

Control Box

Spout

Gear Motor

Liquid Line
Service Valve

Ice Chute

Inlet Water Valve

Suction Line
Service Valve

Top Panel

Power Cord

Float Switch

Reservoir

Liquid Line
Shutoff Valve

Suction Line

Shutoff Valve
BC
(infrared sensor)

Right Side
Panel

Rear View

Drier

Model Shown: FS-1001MLJ-C

8

Strainer

Drain Valve

2. Condensing Unit

a) SRC-10J

Top Panel

Condenser

Headmaster (C.P.R.)

Receiver

Left Side Panel

b) SRC-14J

Fan Motor

Liquid Line
Shutoff Valve

Top Panel

High-Pressure Switch

Right Side Panel

Compressor

Control Box

Control Box Cover

Suction Line
Shutoff Valve

Control Low-Pressure
Switch

Safety Low-Pressure
Switch

Louver Panel

Condenser

Headmaster (C.P.R.)

Receiver

Left Side Panel

Fan Motors

Data Pending

High-Side
Service Valve

Compressor

Low-Side
Service Valve

Control Low-Pressure Switch

High-Pressure Switch

Right Side Panel

Control Box

Control Box Cover

Louver Panel

Safety Low-Pressure Switch

9

3. Icemaking Unit

Cutter

Extruding Head-Upper Bearing

Evaporator Heater (-C Models)

Drip Pan

Auger

Cylinder

Mechanical-Seal

O-Ring

Lower Housing

Seal Bolt

Insulation

Socket Head Cap Screw
with Split Lock Washer

Hex Bolt and Washer

Spline Coupling

Gear Motor

Model Shown: FS-1500MAJ-C

10

B. Water/Refrigeration Circuit Diagram

Receiver

Headmaster (C.P.R.)

High-Pressure

Switch

Discharge Line

Shutoff Valve

SRC

FS

Condenser

Pump-Down

Fan Motors

Solenoid Valve

Liquid Line

Shutoff Valve

Liquid Line

Service Valve

Strainer

Liquid Line

Suction Line

Drier

Suction Line

Shutoff Valve

Suction Line

Service Valve

Drain

Valve

Control Low-Pressure Switch

Drain Outlet

Compressor

Safety Low-Pressure Switch

Inlet

Water

Expansion Valve

Float Switch

Valve

Reservoir

Evaporator

Water Level

Gear

Motor

Overow

Water

Supply

Line

11

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Operation Flow Chart

WV continues

GM de-energized

Low Water Safety

Shutdown

90. sec. PT terminates

unit shuts down and

1-beep alarm continues.

When UFS closes, alarm

resets and 2. Ice Purge

Cycle starts.

Normal Operation

UFS open

WV energized

PDS de-energized

(CLPS opens)

Comp de-energized

FMR de-energized

GM continues

90 sec.

90 sec. FT exceeded, 90

sec. PT starts and 1-beep

Purge Timer

Rell

alarm sounds

FT Maximum

90 sec.

LFS closed

FT off (90 sec.)

UFS closed

FZT starts (30 min.)

FT terminated

WV de-energized

Comp continues

EH continues

FMR continues

GM continues

PDS continues

Low Water Safety

FMR-fan motor-remote

FT-ll timer (low water safety)

FZT-freeze timer

GM-gear motor

LFS-lower oat switch

PDS-pump-down solenoid valve

PT-purge timer

UFS-upper oat switch

WV-inlet water valve

to "1. Fill Cycle" above

4. Icemaker Restart

10-min. DT terminated

DV de-energized

1-in-12 DT reset

Legend:

BC-bin control (infrared sensor)

CB-control board

CCH-crankcase heater

CLPS-control low-pressure switch

Comp-compressor

DC-drain cycle

DT-drain timer

DV-drain valve

EH-evaporator heater

3. 10-Min. Drain

UFS open

LFS open (WV on)

FT starts (90 sec.)

FZT terminated

WV energized

Comp continues

EH continues

FMR continues

GM continues

PDS continues

DV energized

GM de-energized

Operation Flow Chart

4. 1-in-12 Drain Cycle - Although the factory default 1-in-1 drain cycle

is recommended, a 1-in-12 drain cycle is available. For 1-in-12 drain cycle

sequence, see "3. 1-in-12 Hour Drain Cycle & Restart (optional)."

3. Freeze Cycle

2. Ice Purge Cycle

1. Fill Cycle

1-in-1 drain cycle. DV opens for 2 sec.

every hour (CB S1 Dip Switch 4).

To bypass, press the

"SERVICE" button after

30-min. FZT

DV de-energizes, no interruption

in ice production

2. Continued Operation

FZT exceeded (LFS does not

open): CB shuts down icemaker

Icemaker status does not change.

5 min.

GM starts.

5 or 30 sec.

(S1 Dip Switch 7)

and sounds a 5-beep alarm.

PDS energized

CLPS closed

Comp energized

FMR energized

EH continues

GM continues

EH energized

GM energized

DV energizes for 2 sec.

1. DT Initiates DC

Continued uninterrupted

operation

LFS closed

UFS closed

FZT starts

FT terminated

WV de-energized

FT Maximum

90 sec.

5 min.

2. Ice Purge Cycle

1. DT Initiates DC

Comp de-energized

FMR de-energized

PDS de-energized

GM continues

1. Startup

Power Switch "ON"

Control Switch in "ICE"

POWER OK LED on

BC Green LED on

If Fill > 90 sec. FT

1-beep alarm sounds

WV continues

When UFS closes

alarm resets and

Startup

WV energized

BC Yellow LED off

2. Ice Purge Cycle starts.

2. 1-in-1 Drain Cycle

(CB S1 dip switch 4 "OFF")

& Restart (optional)

(CB S1 dip switch 4 "ON")

3. 1-in-12 Drain Cycle

Note: CCH energizes when power is supplied to SRC.

CCH de-energizes when Comp is energized.

See "VII.B.3. SRC-10J Condensing Unit."

12

2. Shutdown Flow Chart

to "2. Ice Purge Cycle" in

Icemaking and Drain Cycle

Chart

BC Green LED on

BC Yellow LED off

4. Icemaker Restart

BC de-activated

3. Icemaker Off

GM de-energized

EH continues

5 min.

2. Ice Purge Cycle

PDS de-energized

(CLPS opens)

Comp de-energized

FMR de-energized

GM continues

EH continues

Shutdown Flow Chart

1. Bin Full

BC delay determined by CB S1 dip

BC Yellow LED (ashing or steady)

switch 1, 2, 3

BC activated

1. BC (infrared sensor) Shutdown

BC Green LED on

BC Yellow LED off

If BC fails to shutdown the icemaker.

See "II.D. Bin Control Check."

13

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.

• 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/storage bin.

• Make sure all food zones in the icemaker and dispenser unit/storage bin are clean
after the unit is serviced.

1. Ice Production Check

To check production, prepare a bucket or pan to catch the ice and a set of scales to
weigh the ice. After the appliance has operated for 10 to 20 min., catch the ice production
for 10 min. Weigh the ice to establish the batch weight. Multiply the batch weight by
144 for the total production in 24 hours. When conrming production or diagnosing
low production, reference production information found in "VII.A. Specication and
Performance Data Sheets."

14

2. Diagnostic Procedure

This 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 appliance nameplate, and adequate water pressure (10 PSIG to 113 PSIG). Check
that both the 24VAC circuit fuse and the 115VAC GM fuse are good.

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

establish a good neutral connection.

• When checking low voltage (24VAC), always choose a neutral (LBU) wire to
establish a good neutral connection.

• When checking control board DC voltage (5VDC), always place the red positive
test lead from the multimeter to CB K5 pin closest to CB K4 connector.
See "II.C. Control Board Check."

• When checking BC (infrared sensor) (20VDC), check that BC (infrared sensor)
green LED is on. This green LED conrms 20VDC power from CB K6to BC
(infrared sensor) and remains on constantly. If green LED is not on, check for
20VDC from CB K6 #1 (DBU) to CB K6 #3 (BR).
See "II.D. Bin Control Check."

• To speed up the diagnostic process, the 5-min. ice purge cycle may be bypassed
by pressing the "SERVICE" button on the control board after the gear motor
starts. WARNING! Risk of electric shock. Care should be taken not to touch
live terminals.

• If the icemaker is in alarm, see "III.A.2. LED Lights and Audible Alarm Safeties."

• EH energizes when "GM" LED turns on.

• CB X1 relay energizes PDS. After PDS energizes, CPLS closes, then MC
energizes, energizing Comp and FMR.

• CB monitors the following switches with 5VDC during the icemaking process:
Control Switch (CS), Compressor Control Relay (CCR), Float Switch (FS). When
5VDC is present across any of these switches, the switch is open.

1) Remove the front panel, then move the power switch to the "OFF" position. Move the
control switch to the "DRAIN" position, then move the power switch back to the "ON"
position. Replace the front panel in its correct position.

2) Allow the water system to drain for 5 min.

3) Remove the front panel. Move the power switch to the "OFF" position, then unplug the
appliance from the electrical outlet.

4) Remove the control box cover and access CB.

5) Check the CB S1 dip switch settings, see "III.B.1. Default Dip Switch Settings" to assure
that they are in the correct positions. For proper operation of BC (infrared sensor),
conrm that S1 dip switch 7 is in the "ON" position.

15

6) Startup – CB "POWER OK" LED is on. Plug the icemaker back into the electrical
outlet, then move the power switch to the "ON" position. Move the control switch to the
"ICE" position. CB "POWER OK" LED and BC green LED turn on.
Diagnosis CB "POWER OK" LED: If CB"POWER OK" LED is off, check for proper
supply voltage (115VAC) input to CT. If 115VAC is not present, check the power switch
and breaker. Next, check for proper 24VAC output voltage from CT. Check CBK8
#1 (W/R) to #2 (LBU) for 24VAC. If 24VAC is not present and 1A 24VAC fuse is good,
replace CT. If 24VAC is present and CB "POWER OK" LED is off, replace CB.
Diagnosis BC (infrared sensor): Check that BC green LED is on. If CB "POWER
OK" LED is on and BC green LED is off, check CB K6 #1 (DBU) to CB K6 #3 (BR)
for 20VDC. If20VDC is not present, conrm S1 dip switch 7 is in the "ON" position.
IfS1dip switch 7 is in the "ON" position and 20VDC is not present, replace CB. IfBC
yellow LED is on or ashing, move ice away from lens. If no ice is present, clean the
lens with a warm, clean damp cloth. If BC yellow LED is still on or ashing after cleaning
the lens, replace BC.

7) Fill Cycle – "WTRIN" LED is on. Reservoir is empty and LFS and UFS are open.
FTstarts. WV energizes and ll cycle starts. LFS closes. Nothing happens at this time.
Reservoir continues to ll until UFS closes. When UFS closes, FT terminates, WV
de-energizes and CB "WTRIN" LED turns off. FZTand 30-sec. GM delay timer start.
IfUFS remains open longer than 90 sec. after LFS opens, FTexceeded and CB sounds
a 1-beep alarm. WVremains energized until UFS closes. Alarm resets automatically
when UFS closes. Diagnosis: If reservoir is empty and "WTRIN" LED is off, conrm
LFS status.
See "II.F.1. Float Switch Check." If LFS is open and "WTRIN" LED is off, replace
CB. If"WTRIN" LED is on, check that the reservoir lls. If not, check water supply
line shut-off valve, water lters, and WVscreen. If "WTRIN" LED is on and WV is off,
check CB K2 #8(O) to a neutral (LBU) for 24VAC. If 24VAC is not present, check CB
K2#9(W/R) to a neutral (LBU) for 24VAC. If 24VAC is present on CB K2 #9(W/R)and
not on CB K2 #8 (O), replace CB. If 24VAC is present on CB K2 #8(O), check
continuity through WV solenoid. If open, replace WV. If WV is energized and rell
exceeds FT with no water in the reservoir, check for DV leaking. Ifreservoir is full and
overowing check for open UFS. See "II.F.1. Float Switch Check." If UFS is closed,
check that WV de-energizes. If not, check CB K2 #8 (O) to a neutral (LBU) for 24VAC.
If 24VAC is present, replace CB. IfWV de-energizes and water continues to ll the
reservoir, replace WV.

16

8) Ice Purge Cycle – "GM" LED is on. 30-sec. GM delay timer terminates, GM, EH,
and CCR energize. Once CCR energizes, 5VDC circuit closes through CCR terminal
#3(W/O) and terminal #5 (W/O) and CB K9 #5 (W/O) and K9 #6 (W/O). After 5VDC
circuit closes, 5-min. ice purge timer starts. Tobypass the 5-min. 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.
Diagnosis: If "GM" LED is off, check that UFS closes and WV de-energizes. If UFS

is closed, 30 sec. has passed, and "GM" LED remains off, replace CB. If "GM" LED is
on and GM is off, check CB K1 #3 (BK) to a neutral (W) for 115VAC. If 115VAC is not
present, check 115VAC power supply. If 115VAC is present, check CB K1 #2(P) to a
neutral (W). If 115VAC is present on CB K1 #3 (BK) and not on CB K1 #2 (P), replace
CB. If 115VAC is present on CB K1 #2 (P), check GM fuse, GM internal protector,
GM windings and capacitor, and GM coupling between auger and GM. When GM
energizes, CCR energizes starting 5-min. ice purge timer.

9) Freeze Cycle – "COMP" and "GM" LEDs are on. Note: CB X1 relay energizes the
PDS (pump-down solenoid) not the MC (magnetic contactor). The 5-min. ice purge
timer terminates. GM, EH, and CCR continue. PDS energizes. Once the refrigeration
circuit low-side pressure reaches 29 PSIG, CLPS closes, energizingMC, MC then
energizes Comp and FMR. CCH de-energizes. Iceproduction starts 4 to 6 min. after
Comp energizes depending on ambient and water conditions. As ice is produced, the
water level in the reservoir drops. UFS opens. Nothing happens at this time. When LFS
opens, WV energizes and rell cycle begins, FZT terminates, and FTstarts.
FZT: 30-Min. Freeze Safety Timer – FZT starts when UFS closes and terminates
when LFS opens. If LFS does not open within 30 min. of UFS closing, CB shuts down
the icemaker and sounds a 5-beep alarm. See "III.A.2.LED Lights and Audible Alarm
Safeties." To reset, turn the power supply off and on again. See "II.G. Diagnostic Tables"
for troubleshooting details.
Icemaker Diagnosis (CCR): 5-min. ice purge timer terminates, CB "COMP" LED is
on and PDS energizes. If not, check for 5VDC between CB K5 connector pin closest
to CB K4 connector and CB K9connector #5(W/O). If 5VDC is not present, replace
CB. If 5VDC is present, check for 5VDC between CB K5 connector pin closest to CB
K4 connector and CB K9connector #6(W/O). If 5VDC is present and CB "Comp"
LED is off (PDS not energized), replace CB. If 5VDC is not present, check for 115VAC
between CCR terminal #7(O) to CCR terminal #8(W) for 115VAC. If115VAC is not
present (GM not energized), see step 8 above. If 115VAC is present and CCR contacts
are open (5VDCpresent between terminals #3(W/O) and #5(W/O)), check CCR
solenoid voltage and solenoid continuity. Replace CCR if necessary.
Icemaker Diagnosis (PDS): If"COMP" LED is on and PDS is not energized, check
CB X1 relay black (BK) wire to a neutral (W) and CB X1 relay violet (V) wire to a neutral
(W) for 115VAC. If115VAC is present on CB X1black (BK) wire and not on CBX1
violet(V) wire, replace CB. If115VAC is present on CBX1 violet(V) wire and PDS is
not energized, check for 115VAC at PDS (V) to a neutral (W) for 115VAC. If 115VAC is
present and PDS is not energized, check PDS solenoid for continuity. If open or if PDS
is sticking closed, replace PDS.

17

Condensing UnitDiagnosis: Conrm that CLPS closes. Once CLPS closes, MC
energizes, energizing Comp and FMR. If not, check condensing unit 208-230VAC
power supply, breakers, disconnects. Next, conrm 115VAC from CLPS BK wire to
neutral (W). If 115VAC is not present, check wiring connections and power supply.
CLPS: When PDS is energized, CLPS closes when refrigeration circuit low-side
pressure reaches 29 PSIG. If CLPS is open, check that refrigeration circuit low-side
pressure has reached 29 PSIG. If refrigeration circuit low-side pressure is too low,
conrm proper TXV operation, check for refrigerant restrictions (drier, PDS), and correct
refrigerant charge. Recover, evacuate, and recharge if necessary. If refrigeration circuit
low-side pressure reaches 29 PSIG and CLPS does not close, replace CLPS.
SLPS: If SLPS is open, manually reset SLPS. If manually resetting SLPS does not
close contacts, replace SLPS. After resetting, conrm proper TXV operation, check for
refrigerant restriction (drier, PDS), and correct refrigerant charge. Recover, evacuate,
and recharge if necessary.
HPS: If HPS is open, HPS automatically resets when refrigeration circuit high-side
pressure is within an acceptable range. If HPS does not reset (open), allow pressures
to equalize and HPS to reset. If refrigeration circuit high-side pressure does not drop,
recover, evacuate, and recharge if necessary. Before restarting the appliance, check
for dirty or clogged condenser. Once the appliance is restarted, check for proper FMR
operation and fan blade for binding. Check receiver, service valves, PDS, and drier
for refrigeration circuit restriction. Also check for proper HM operation. If high-side
refrigerant pressures have returned to an acceptable range and HPS does not close,
replace HPS.
MC: If MC energizes and Comp does not energize, check for 115VAC at MC C2 (O) to
neutral (W). If 115VAC is not present, check CLPS, SLPS, and HPS contacts. If 115VAC
is present, check MC coil continuity. If open, replace MC. If closed, check MC L1 and
MCL2to a neutral (W) for 115VAC. If 115VAC is not present on either L1or L2, check
incoming power supply. If 115VAC is present on both L1 and L2 and Comp does not
start, check MC T1 (BK) to MC T2 (R) for 208-230VAC. If 208-230VAC is not present,
replace MC. If 208-230VAC is present, check Comp start relay, start capacitor, run
capacitor, and Comp motor windings. If FMR does not energize, check MC T3 (DBU) to
a neutral (W) for 115VAC. If 115VAC is present and FMR does not energize, check fan
motor capacitors and motor windings. If 115VAC is not present, replace MC.

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10) Rell Cycle – "GM", "COMP", and "WTRIN" LEDs are on.
LFS opens. WVenergizes and FT starts. GM, CCR, EH, PDS, MC, Comp, and FMR
continue. LFS closes. Nothing happens at this time. Reservoir continues to ll until UFS
closes. When UFS closes, WV de-energizes, FT terminates, and FZT starts. IfUFS
remains open longer than 90 sec. after LFS opens, FT exceeded and CB sounds a
1-beep alarm. WVremains energized until UFS closes. Alarm resets automatically when
UFS closes.
Diagnosis – Conrm that the water level has dropped and the UFS and LFS are open.
See "II.F.1. Float Switch Check." Check that "WTRIN" LED is on. IfLFS is open and
"WTRIN" LED is off, replace CB. If "WTRIN" LED is on, check that the reservoir lls.
Ifnot, check water supply line shut-off valve, water lters, and WVscreen. If"WTRIN"
LED is on and WV is off, check CB K2 #8(O) to a neutral (LBU) for 24VAC. If 24VAC is
not present, check CB K2 #9(W/R) to a neutral (LBU) for 24VAC. If 24VAC is present
on CB K2 #9 (W/R)and not on CB K2#8 (O), replace CB. If 24VAC is present on
CB K2#8(O),check continuity through WV solenoid. If open, replace WV. If WV is
energized and rell exceeds FT with no water in the reservoir, check for DV leaking. If
reservoir is full and overowing check for open UFS. See "II.F. Float Switch Check and
Cleaning." If UFS is closed, check that WVdeenergizes. If not, check CB K2 #8 (O)
to a neutral (LBU) for 24VAC. If 24VAC is present, replace CB. If WV de-energizes and
water continues to ll the reservoir, replace WV.
FT: 90-Sec. Low Water Safety Timer – When LFS opens, 90-sec. low water safety
timer starts. If UFS does not close within 90 sec. after LFS opens (FTexceeded),
CBsounds a 1-beep alarm and a 90-sec. shutdown cycle starts.
See "III.A.2.LED Lights and Audible Alarm Safeties." PDS de-energizes. Refrigeration
circuit low-side pressure drops to 9PSIG, opening CLPS. CLPS opens, de-energizing
MC, which de-energizes Comp and FMR. GM, CCR, and EH continue. 90-sec. purge
timer terminates, GM, EH, and CCR de-energize. WV and 1-beep alarm continue until
UFS closes.

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