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Hoshizaki
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FD650MRJC
Part List
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User Manual
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User Manual
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Hoshizaki FD650MRJC User Manual

Service Manual
Modular Flaker with F-A and F-C Control Boards
Models H and J Series
Number: 73204 Issued: 7-23-2014 Revised: 3-6-2019
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: 1-800-233-1940; (770) 487-2331 Fax: 1-800-843-1056; (770) 487-3360
E-mail: techsupport@hoshizaki.com
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 ................................................................................................. 6
I. Construction and Water/Refrigeration Circuit Diagram ....................................................... 8
A. Construction .................................................................................................................. 8
1. Air-Cooled Models .................................................................................................... 8
2. Water-Cooled Models ............................................................................................. 9
3. Remote Air-Cooled Models .................................................................................... 10
4. Low-Side, Parallel Rack System Models ................................................................11
B. Icemaking Unit ............................................................................................................ 12
C. Water/Refrigeration Circuit Diagram ............................................................................ 13
1. Air-Cooled Models .................................................................................................. 13
2. Water-Cooled Models ............................................................................................ 14
3. Remote Air-Cooled Models .................................................................................... 15
4. Low-Side, Parallel Rack System Models ............................................................... 16
II. Sequence of Operation and Service Diagnosis ............................................................... 17
A. Sequence of Operation Flow Chart ............................................................................. 17
1. Icemaking and Drain Cycle .................................................................................... 17
2. Shutdown .............................................................................................................. 18
B. Service Diagnosis ....................................................................................................... 19
C. Control Board Check ................................................................................................... 25
D. Bin Control Check ....................................................................................................... 30
E. Float Switch Check and Cleaning ............................................................................... 34
F. Diagnostic Tables ......................................................................................................... 36
III. Controls and Adjustments ............................................................................................... 39
A. Control Board .............................................................................................................. 39
1. Control Board Layout ............................................................................................. 40
2. LED Lights and Audible Alarm Safeties ................................................................. 41
3. Ice Purge Cycle Bypass ......................................................................................... 41
B. Controls and Adjustments ........................................................................................... 42
1. Default Dip Switch Settings .................................................................................... 42
2. BC1 (Infrared Sensor) Shutdown Delay (S1 dip switch 1, 2, 3) ............................. 43
3. Drain Frequency Control (S1 dip switch 4) ............................................................ 43
4. Continuous Dispensing Timer (S1 dip switch 5 & 6) .............................................. 43
5. Bin Control Selector (S1 dip switch 7) ................................................................... 44
6. BC2 (Mech. Stand-Alone) Shutdown Initiation Delay (S1 dip switch 8) ................. 44
7. BC2 (Mech. Stand-Alone) Shutdown Time (S1 Dip Switch 9) ................................ 44
8. Factory Use (S1 Dip Switch 10) ............................................................................. 44
C. Power Switch and Control Switch ................................................................................ 45
IV. Refrigeration Circuit and Component Service Information.............................................. 46
A. Refrigeration Circuit Service Information .................................................................... 46
B. Component Service Information .................................................................................. 49
3
V. Maintenance .................................................................................................................... 56
VI. Disposal .......................................................................................................................... 58
VII. Technical Information ..................................................................................................... 59
A. Specication & Performance Data Sheets .................................................................. 59
1a. F-1001MAH .......................................................................................................... 59
1b. F-1001MAH-C ...................................................................................................... 60
2a. F-1001MWH ......................................................................................................... 61
2b. F-1001MWH-C ..................................................................................................... 62
3a. F-1001MRH .......................................................................................................... 63
3b. F-1001MRH-C ...................................................................................................... 64
4a. F-1501MAH .......................................................................................................... 65
4b. F-1501MAH-C ..................................................................................................... 66
5a. F-1501MWH ......................................................................................................... 67
5b. F-1501MWH-C ..................................................................................................... 68
6a. F-1501MRH.......................................................................................................... 69
6b. F-1501MRH-C ...................................................................................................... 70
7. F-2001MWH ........................................................................................................... 71
8a. F-2001MRH ......................................................................................................... 72
8b. F-2001MRH-C ...................................................................................................... 73
8c. F-2001MRH3 .........................................................................................................74
9. F-2001MLH ............................................................................................................ 75
10. FD-650MAH-C ..................................................................................................... 76
11. FD-650MWH-C ..................................................................................................... 77
12. FD-650MRH-C ..................................................................................................... 78
13. FD-1001MAH-C ................................................................................................... 79
14. FD-1001MRH-C ................................................................................................... 80
15a. F-450MAJ .......................................................................................................... 81
15b. F-450MAJ-C ....................................................................................................... 82
16a. F-801MAJ........................................................................................................... 83
16b. F-801MAJ-C ....................................................................................................... 84
17a. F-801MWJ.......................................................................................................... 85
17b. F-801MWJ-C ...................................................................................................... 86
18a. F-1001MAJ ......................................................................................................... 87
18b. F-1001MAJ-C ..................................................................................................... 88
19a. F-1001MWJ ........................................................................................................ 89
19b. F-1001MWJ-C .................................................................................................... 90
20a. F-1001MRJ ........................................................................................................ 91
20b. F-1001MRJ-C ..................................................................................................... 92
21a. F-1001MLJ ......................................................................................................... 93
21b. F-1002MLJ ......................................................................................................... 94
22a. F-1002MAJ ........................................................................................................ 95
22b. F-1002MAJ-C ..................................................................................................... 96
23a. F-1002MWJ ....................................................................................................... 97
23b. F-1002MWJ-C .................................................................................................... 98
24a. F-1002MRJ ........................................................................................................ 99
24b. F-1002MRJ-C .................................................................................................. 100
4
25a. F-1501MAJ........................................................................................................101
25b. F-1501MAJ-C ................................................................................................... 102
26a. F-1501MWJ...................................................................................................... 103
26b. F-1501MWJ-C .................................................................................................. 104
27a. F-1501MRJ ...................................................................................................... 105
27b. F-1501MRJ-C ................................................................................................... 106
28a. F-2001MLJ ....................................................................................................... 107
28b. F-2001MWJ...................................................................................................... 108
28c. F-2001MRJ ...................................................................................................... 109
28d. F-2001MRJ-C ...................................................................................................110
28e. F-2001MRJ3 ..................................................................................................... 111
29. FD-650MAJ-C .....................................................................................................11 2
30. FD-650MWJ-C ....................................................................................................11 3
31. FD-650MRJ-C .....................................................................................................114
32. FD-1001MAJ-C ...................................................................................................115
33. FD-1001MRJ-C ................................................................................................... 116
34. FD-1002MAJ-C ...................................................................................................11 7
35. FD-1002MRJ-C ...................................................................................................11 8
B. Wiring Diagrams ......................................................................................................... 119
1. F-1001MAH(-C), F-1001MWH(-C), F-1001MRH(-C), FD-1001M_H-C ...................119
2. F-1501M_H(-C) .................................................................................................... 120
3. F-2001MWH(-C), F-2001MRH(-C)(3), F-2001MWJ, F-2001MRJ(-C)(3) ............... 121
4. F-1001MLJ, F-1002MLJ, F-2001MLH, F-2001MLJ ............................................... 122
5. FD-650M_H-C ..................................................................................................... 123
6. F-450MAJ(-C) ...................................................................................................... 124
7. F-801M_J(-C) ....................................................................................................... 125
8. F-1001MAJ(-C), F-1001MWJ(-C), F-1001MRJ(-C) ............................................... 126
9. F-1002MAJ(-C), F-1002MWJ(-C), F-1002MRJ(-C), FD-1002M_J-C .................... 127
10. F-1501M_J(-C) ................................................................................................... 128
11. FD-650M_J(-C)................................................................................................... 129
12. FD-1001M_J-C ................................................................................................... 130
5

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 installation, 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 install, operate, 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.
• 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.
• 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. Failure to properly ground the icemaker could result in death or serious injury.
• To reduce the risk of electric shock, do not touch the power switch or control switch with damp hands.
• Move the power switch to the "OFF" position and turn off the power supply before servicing. Lockout/Tagout to prevent the power supply from being turned back on inadvertently.
• Do not place ngers or any other objects into the ice discharge opening.
• Do not make any alterations to the appliance. Alterations could result in electric shock, injury, re, or damage.
6
WARNING, continued
• 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.
Additional Warning for Remote Models
• 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.
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. Air-Cooled Models

Inlet Water Valve
Float Switch
Reservoir
Spout
Evaporator Heater (-C)
Drip Pan
Ice Chute
Water Supply Inlet
Bin Control 2 (Mechanical) (If Applicable)
Junction Box
High-Pressure Switch
Thermostatic Expansion Valve
Evaporator
Drain Valve
Gear Motor
Bin Control 1 (Infrared Sensor)
Model Shown: F-1501MAH
Control Switch
Power Switch
Fan Motor
Condenser
Drier
Compressor
8

2. Water-Cooled Models

Spout
Drip Pan
Evaporator
Thermostatic Expansion Valve
Drain Valve
Float Switch
Reservoir
Inlet Water Valve
Water Supply Inlet
Junction Box
Control Switch
Power Switch
Water Regulating
Valve Water-Cooled Condenser
High-Pressure Switch
Gear Motor
Ice Chute
Drier
Compressor
Bin Control 1 (Infrared Sensor)
Model Shown: FD-650MWH-C
9

3. Remote Air-Cooled Models

Float Switch
Reservoir
Spout
Drip Pan
Evaporator Heater (-C)
Inlet Water Valve
Bin Control (2) (Mechanical) (If Applicable)
Water Supply Inlet
High-Pressure Switch
Junction Box
Evaporator
Thermostatic Expansion Valve
Drain Valve
Inlet Water Valve
Reservoir
Spout
Water Supply Inlet
Float Switch
Gear Motor
Junction Box
Ice Chute
Model Shown: F-1001MRH-C
High-Pressure Switch
Compressor
Crankcase Heater
Control Switch
Power Switch
Reciever
Drier
Evaporator Heater (-C)
Control Switch
Power Switch
Drip Pan
Reciever
Evaporator
Bin Control (Infrared Sensor)
Drain Valve
Model Shown: F-1001MRJ-C
10
Gear Motor
Ice Chute
Drier
Compressor
Thermostatic Expansion Valve
Crankcase Heater

4. Low-Side, Parallel Rack System Models

Inlet Water Valve
Float Switch
Reservoir
Spout
Evaporator Heater (-C)
Evaporator
Bin Control 2 (Mechanical) (If Applicable)
Water Supply Inlet
Control Switch
Thermostatic Expansion Valve
Drain Valve
Gear Motor
Ice Chute
Bin Control 1 (infrared sensor)
Model Shown: F-2001MLH
Power Switch
Liquid Line Valve
Suction Line Valve
Evaporator Pressure Regulator Valve (EPR)
11

B. 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: F-1501MAH
12

C. Water/Refrigeration Circuit Diagram

1. Air-Cooled Models

Inlet Water Valve
Float
Water Supply Line
Reservoir
Overow
Switch
Water Level
Evaporator
Spout
Evaporator Condensate Drain Pan (Drip Pan)
Insulation
Drain Outlet
Drier
Condenser Fan Motor
Drain Valve
Gear Motor Drain Pan
Thermostatic Expansion Valve
Gear Motor
Drain Hose
Condenser
High Pressure Switch
Compressor
13

2. Water-Cooled Models

Water Supply Line
Reservoir
Inlet Water Valve
Float Switch
Overow
Water Level
Evaporator
Spout
Evaporator Condensate Drain Pan (Drip Pan)
Drain Valve
Thermostatic Expansion Valve
Gear Motor
Drain Hose
Insulation
Drain Outlet
Water Supply Line
Condenser
Drain Outlet
Water Regulating Valve
Gear Motor Drain Pan
Drier
High-Pressure Switch
Compressor
14

3. Remote Air-Cooled Models

Inlet Water Valve
Float
Water Supply Line
Reservoir
Overow
Switch
Water Level
Evaporator
Spout
Evaporator Condensate Drain Pan (Drip Pan)
Insulation
Drain Outlet
Drier
Condenser Fan Motor
Drain Valve
Gear Motor Drain Pan
Thermostatic Expansion Valve
Gear Motor
Drain Hose
Remote Condenser
High-Pressure Switch
Compressor
15

4. Low-Side, Parallel Rack System Models

Inlet Water Valve
Water Supply Line
Reservoir
Overow
Float Switch
Water Level
Evaporator
Spout
Evaporator Condensate Drain Pan (Drip Pan)
Insulation
Drain Valve
Drain Outlet
NOTICE! F-1001MLH Use only with R-404A F-1002MLJ Use only with R-404A, R-407A, or R-407F
EPR Settings: F-1001MLH: R-404A EPR Setting: 31 PSIG F-1002MLJ: R-404A EPR Setting: 31 PSIG R-407A EPR Setting: 22 PSIG R-407F EPR Setting: 23 PSIG
From Rack System
Evaporator Pressure Regulator (EPR Valve)
Thermostatic Expansion Valve
Gear Motor
Drain Hose
Gear Motor Drain Pan
Liquid Line Valve
To Rack System
Suction Line Valve
16

II. Sequence of Operation and Service Diagnosis

A. Sequence of Operation Flow Chart

1. Icemaking and Drain Cycle

WV continues
GM de-energized
FM de-energized
FMR 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.
GM continues
FM continues
WV de-energized
Comp continues
FMR continues
GM continues
FM continues
FMR continues
LLV continues
SLV continues
Low Water Safety
Purge Timer
90 sec. FT exceeded,
90 sec. PT starts and
1-beep alarm sounds
90 sec.
UFS open
WV energized
LFS closed
UFS closed
Comp de-energized
LLV de-energized
min.)
FZT starts (30
SLV de-energized
FT terminated
Normal Operation
to "1. Fill Cycle" above
4. Icemaker Restart
10-min. DT terminated
DV de-energized
1-in-12 DT reset
Control Board Sequence of Operation Flow Chart - Icemaking and Drain Cycle
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
3. Freeze Cycle
cycle sequence, see "3. 1-in-12 Hour Drain Cycle & Restart (optional)."
2. Ice Purge Cycle
1. Fill Cycle
Rell
1-in-1 drain cycle. DV opens for 2 sec. every hour
(CB S1 Dip Switch 4).
To bypass, press the
"SERVICE" button after
FT Maximum
90 sec.
Icemaker status does not change.
5 min.
GM starts.
5 or 30 sec.
FT off (90 sec.)
30-min. FZT
FZT exceeded (LFS does not
open): CB shuts down icemaker
(S1 Dip Switch 7)
FT Maximum
90 sec.
UFS open
LFS open (WV on)
and sounds a 5-beep alarm.
Comp energized
EH energized
GM energized
LFS closed
UFS closed
FT starts (90 sec.)
FZT terminated
WV energized
LLV energized
SLV energized
GM continues
FM energized
FMR energized
FZT starts
FT terminated
WV de-energized
Comp continues
FM continues
GM continues
FMR continues
FM continues
FMR continues
LLV continues
SLV continues
DV de-energizes, no
2. Continued Operation
1. DT Initiates DC
Continued uninterrupted
interruption in ice production
DV energizes for 2 sec.
operation
3. 10-Min. Drain
5 min.
2. Ice Purge Cycle
1. DT Initiates DC
DV energized
Comp de-energized
GM de-energized
LLV de-energized
FM de-energized
SLV de-energized
FT-ll timer (low water safety)
FMR de-energized
GM continues
FM continues
FZT-freeze timer
GM-gear motor
FMR continues
LFS-lower oat switch
LLV-liquid line valve (MLH)
PT-purge timer
SLV-suction line valve (MLH)
UFS-upper oat switch
WV-inlet water valve
Power Switch "ON"
Control Switch in "ICE"
1. Startup
POWER OK LED on
BC1 Green LED on
Startup
BC1 Yellow LED off
BC(2) Closed
WV energized
If Fill > 90 sec. FT
1-beep alarm sounds
WV continues
When UFS closes
alarm resets and
2. Ice Purge Cycle starts.
17
(CB S1 dip switch 4 "OFF")
2. 1-in-1 Drain Cycle
& Restart (optional)
(CB S1 dip switch 4 "ON")
3. 1-in-12 Drain Cycle
Legend:
BC-bin control (mechanical stand-alone)
BC1-bin control 1 (infrared sensor)
BC(2)-bin control (2) (mechanical)
CB-control board
Comp-compressor
DC-drain cycle
DT-drain timer
DV-drain valve
EH-evaporator heater
FM-fan motor
FMR-fan motor-remote

2. Shutdown

4. Icemaker Restart
Note for models with BC1 and BC2:
If BC1 fails to shutdown the icemaker, BC2
opens and a 9-beep alarm sounds. See
"II.D. Bin Control Check."
to "2. Ice Purge Cycle"
in Icemaking and Drain
BC1 Green LED on
BC1 Yellow LED off
Cycle Chart
BC1 de-activated
Control Board Sequence of Operation Flow Chart - Shutdown
3. Icemaker Off
2. Ice Purge Cycle
1. Bin Full
BC1 delay determined by CB S1 dip
switch 1, 2, 3
5 min.
BC1 Yellow LED (ashing or steady)
BC1 Green LED on
BC1 Yellow LED off
GM de-energized
BC1 activated
FM de-energized
Comp de-energized
FMR de-energized
LLV de-energized
SLV de-energized
GM continues
FM continues
FMR continues
to "2. Ice Purge Cycle" in Icemaking
Ice level lowered
2. Icemaker Off 3. Icemaker Restart
1 to 10 sec.
1. Bin Full
BC
and Drain Cycle Chart
BC(2) closed
All Components
Immediate
BC(2) open
BC2
Legend:
BC-bin control (mechanical stand-alone)
BC1-bin control 1 (infrared sensor)
(BC paddle and proximity
switch disengaged)
de-energized
BC paddle and
proximity switch
engaged
Note for models with BC1 and BC2:
When BC2 is activated, a 9-beep alarm
BC(2)-bin control 2 (mechanical)
CB-control board
Comp-compressor
FM-fan motor
FMR-fan motor-remote
GM-gear motor
sounds. See "II.D. Bin Control Check."
LLV-liquid line valve (MLH)
SLV-suction line valve (MLH)
1. BC1 Shutdown (infrared sensor)
2. BC(2) Shutdown (mechanical)
18

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 or auger) 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. 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."
19
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).
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 BC1 (infrared sensor) (20VDC), check that the infrared sensor green LED is on. This green LED conrms 20VDC power from CB K6to the 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."
• FM/FMR and EH (-C model except FD-650) energize when "GM" LED turns on.
• MLH Model: CB X1 relay energizes LLV and SLV.
• CB monitors the following switches with 5VDC during the icemaking process: Control Switch (CS), High-Pressure Switch (HPS), Float Switch (FS), Compressor Control Relay/Gear Motor Protect Relay (CCR/GMPR), and Bin Control (2) (mechanical stand-alone or backup). 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 turn off the power supply.
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 BC1 (infrared sensor), conrm that S1 dip switch 7 is in the "ON" position.
20
6) Startup–CB "POWER OK" LED is on. Turn on the power supply, then move the power switch to the "ON" position. Make sure the control switch is in the "ICE" position. CB "POWER OK" LED and IS (BC1 if applicable) green LED turn on. Diagnosis CB "POWER OK" LED: Check that CB "POWER OK" LED is on. Ifnot, check for 115VAC at control transformer brown (BK on 115VAC models (except FD-650M_H-C) and BR on 208/230VAC models and 115VAC FD-650M_H-C) wire to neutral (W). If 115VAC is not present, check the power switch and breaker. If 115VAC is present, check control transformer continuity. Replace as needed. Next, check for 24VAC at control transformer red (R) wire to neutral (LBU). If 24VAC is not present, check control transformer continuity. Replace as needed. If24VAC is present, check 24VAC 1A fuse. If fuse is good, check for 24VAC at CB K8 #1 (W/R) to CB K8 #2 (LBU). If 24VAC is present and "POWER OK" LED is off, replace CB. Diagnosis BC(2) (mechanical stand-alone or backup): Check that the actuator paddle is properly positioned. Check continuity across BC(2). If open, replace BC(2). Next, check VDC at CB K8#3(GY) to CB K8 #4 (GY). When BC(2)is closed 0VDC is read. Move the actuator paddle to open BC(2). When open, 5VDCis present between CB K8 #3 (GY) and CB K8#4(GY). If 5VDC is not present when BC(2) is open, replace CB. Return actuator to its normal position. Diagnosis BC1 (infrared sensor): If "POWER OK" LED is on and BC1 green LED is off, check 20VDC at CB K6 #1 (DBU) to CB K6 #3 (BR). If 20VDC is not present, conrm dip switch 7 is in the "ON" position. If dip switch 7 is in the "ON" position and 20VDC is not present, replace CB. If BC1 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 cleaning the lens does not work, replace BC1.
7) Fill Cycle – "WTRIN" LED is on. Reservoir is empty and LFS and UFS are open. 90-sec. FT starts. WV energizes and ll cycle starts. LFS closes. Nothing occurs at this time. Reservoir continues to ll until UFS closes. When UFS closes, WV de-energizes, 90-sec. FT is terminated, and CB "WTRIN" LED turns off. 30-min. 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.E.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.E.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.
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8) Ice Purge Cycle – "GM" LED is on. 30-sec. GM delay timer terminates. GM, CCR/GMPR, FM/FMR, and EH (-C model except FD-650) energize. Once CCR/GMPR energizes, 5VDC circuit closes through CCR/GMPR 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 #2 (BK or BR) to a neutral (W) for 115VAC. If115VAC is not present, check 115VAC power supply. If115VAC is present, check CB K1 #3(BK, P, or R) to a neutral (W). If 115VAC is present on CB K1 #2 (BK or BR) and not on CB K1 #3 (BK, P, or R), replace CB. If115VAC is present on CB K1#3 (BK, P, or R), check GM fuse, GM internal protector, GM windings and capacitor, and GM coupling between auger and GM. When GM energizes, CCR/GMPR energizes starting 5-min. ice purge timer. If FM/FMR does not start, check FM/FMR capacitor, FM/FMR windings, and FM/FMR bearings.
9) Freeze Cycle – "COMP" and "GM" LEDs are on. The 5-min. ice purge timer terminates. GM, EH, CCR, and FM/FMR continue. Comp or LLV/SLV (MLH model) energize. Ice production starts 4to 6 min. after Comp or LLV/SLV (MLH model) energize 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.F. Diagnostic Tables" for troubleshooting details. Icemaker Diagnosis (CCR/GMPR): 5-min. ice purge timer terminates, CB "COMP" LED is on and COMP or LLV/SLV (MLH model) 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 (CR, COMP, or LLV/SLV (MLH model) not energized), replace CB. If 5VDC is not present, check for 115VAC between CCR/GMPR terminal #7(O) to CCR/GMPR terminal #8(W) for 115VAC. If115VAC is not present (GM not energized), see step 8 above. If 115VAC is present and CCR/ GMPR contacts are open (5VDCpresent between terminals #3(W/O) and #5(W/O)), check CCR/GMPR solenoid voltage and solenoid continuity. Replace CCR/GMPR if necessary. Icemaker Diagnosis (COMP or LLV/SLV (MLH model)): If"COMP" LED is on and COMP or LLV/SLV (MLH model) is not energized, check CB X1 relay BK or BR wire to a neutral (W) and CB X1 relay V, BR, or R wire to a neutral (W) for 115VAC. If115VAC is present on CB X1BK or BR wire and not on CBX1 V, BR, or R wire, replace CB. If115VAC is present on CBX1V, BR, or R wire and COMP or LLV/SLV (MLH model) is not energized, check for 115VAC at CB X1 Comp relay, Comp or LLV/SLV (MLH model). Check Comp internal overload (motor protector), start relay, and capacitors. Check LLV/SLV (MLH model) solenoid continuity.
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10) Rell Cycle – "GM", "COMP", and "WTRIN" LEDs are on. LFS opens. WVenergizes and 90-sec. FT starts. Comp or LLV/SLV (MLH model), GM, CCR/GMPR, and FM/FMR continue. LFS closes. Nothing occurs at this time. Reservoir continues to ll until UFS closes. When UFS closes, WV de-energizes, 90-sec. FT terminates, and 30-min. 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.E.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.E. 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. 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 unit and sounds a 5-beep alarm every 5 sec.
See "III.A.2 LED Lights and Audible Alarm Safeties." 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." Comp or LLV/SLV (MLH model) de-energizes. GM, CCR/GMPR, and EH continue. 90-sec. purge timer terminates, GM, EH, and CCR/GMPR de-energize. WV and 1-beep alarm continue until UFS closes.
11) Drain Cycle a) 1-in-1 Drain Cycle: DV energizes once every hour when the 1-in-1 drain cycle is
activated (S1 dip switch 4 in the "OFF" position (factory default position)). GM, FM/FMR, Comp, LLV/SLV (MLH model), continue. DV energizes for 2 sec. every hour. This setting is recommended for optimum icemaker performance. The 1-in-1 drain cycle allows any sediment to drain from the evaporator without interrupting the icemaking process.
b) 1-in-12 Drain Cycle (optional): DV energizes once every 12 hours when the 1-in-12
drain cycle is activated (S1 dip switch 4 in the on position (optional)). 12-hour drain cycle timer terminates, Comp or LLV/SLV (MLH model) de-energize. GM, and FM/FMR continue. The 5-min. ice purge timer starts. When the 5-min. ice purge timer terminates, GM and FM/FMR de-energize. 10-min. DT starts, DV energizes. After 10-min. DT terminates, DV de-energizes icemaking process restarts and 12-hour drain cycle timer starts.
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c) Manual Drain: Manual drain is used when servicing evaporator components and
cleaning and sanitizing the unit. When the unit is making ice and the control switch is moved to the "DRAIN" position, there is a 3-sec. delay, then Comp or LLV/SLV (MLH models) de-energize and the 5-min. ice purge timer begins. When the 5-min. ice purge timer terminates, GM, and FM/FMR de-energize. DV energizes to drain the evaporator and reservoir. To avoid the 5-min. shutdown delay, turn off the power supply, then move the control switch to the "DRAIN" position. Turn on the power supply. DV energizes to drain the evaporator and reservoir. DV de-energizes when the control switch is moved to the "ICE" position.
10) Shutdown a) BC1 (infrared sensor): When power is supplied to the icemaker, the green LED on
BC1 turns on. The green LED remains on constantly. As ice lls the storage bin to the level of activating BC1, BC1 yellow LED turns on (ashing or steady). The yellow LED ashes when ice is at the outer limit of its range and turns steady as ice nears. After the yellow LED turns on (ashing or steady), BC1 shutdown delay timer (S1 dip switch 1, 2, 3) starts. For a typical dispenser unit application, a 100-sec. shutdown delay is recommended. When used with a standard Hoshizaki storage bin, any shutdown delay setting is acceptable. See "III.B.2. BC1 (Infrared Sensor) Shutdown Delay (S1 dip switch 1, 2, 3)." Once BC1 shutdown delay timer terminates, Comp or LLV/SLV (MLH models) de-energize and the 5-min. ice purge timer starts. When the 5-min. ice purge timer terminates, GM, CCR/GMPR, and FM/FMR de-energize. Diagnosis: See "II.D.1. Bin Control 1 (infrared sensor) Check."
Note: When BC1 and BC2 are applied–If BC1 fails to shut down the icemaker, BC2
opens, CB shuts down the icemaker and sounds a 9-beep alarm.
b) BC(2) (mechanical stand-alone or backup):
BC (stand-alone): BC opens (actuator paddle engaged). CB shuts down the icemaker within 10 sec. BC2 (backup): BC2 opens (actuator paddle engaged). CB shuts down the icemaker immediately and sounds a 9-beep alarm. Diagnosis: See "II.D.2. Bin Control(2) (mechanical stand-alone or backup) Check."
Legend: BC1–bin control 1 (infrared sensor); BC(2)–bin control (2) (mechanical stand-alone
or backup); CB–control board; CCR–compressor control relay (formerly GMPR gear motor protect relay); Comp–compressor; DV–drain valve; EH–evaporator heater (-C model except FD-650); FM–fan motor; FMR–fan motor-remote; GM–gear motor; LFS–lower oat switch; L LV –liquid line valve (MLH model); SLV – suction line valve (MLH model); UFS–upper oat switch; WV–inlet water valve
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C. Control Board Check

Before replacing a control board that does not show a visible defect and that you suspect is bad, always conduct the following check procedure. This procedure will help you verify your diagnosis.
1) Check CB S1 dip switch settings to assure that they are in the factory default position. For factory default settings, see "III.B.1. Default Dip Switch Settings." Note: S1 dip switch 7determines bin control application: BC (mechanical stand-alone) or BC2 (mechanical backup only): S1 dip switch 7 in the "OFF" position. WARNING! On CB 2A8054-01, do not put S1 dip switch 9 in the
"OFF" position when S1 dip switch 7 is in the "OFF" position. BC1 (infrared sensor stand-alone) or with BC2 (mechanical backup): S1 dip switch
7in the "ON" position.
2) Move the power switch to the "ON" position and move the control switch to the "ICE" position. The "POWER OK" LED turns on. Diagnosis "POWER OK" LED: Check that the CB "POWER OK" LED is on. If not, check for proper supply voltage (115VAC) input to the control transformer (power switch, breaker, and fuse). Next, check for proper low-voltage (24VAC) output from the control transformer and that the 1A fuse is good. Check for 24VAC at CB K8 #1 (W/R) to CB K8 #2 (LBU). If 24VAC is present and the "POWER OK" LED is off, replace CB.
3) BC1 (infrared sensor) Power Supply (K6 connector): CB supplies 20VDC to BC1 and BC1 green LED is on. Diagnosis: Check that BC1 green LED is on. If not, check for 20VDC between CB K6 #1 (DBU) and CB K6 #3(BR). See Fig. 1. If 20VDC is not present, replace CB. If 20VDC is present, conrm that the yellow LED is not ashing or steady. If BC1 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 cleaning the lens does not work, replace BC1 (infrared sensor).
BC1 (infrared sensor) (20VDC) Closed 20VDC K6 #1 (DBU) to K6 #3 (BR) 20VDC K6 #1 (DBU) to K6 #2 (W) 0VDC K6 #2 (W) to K6 #3 (BR)
BC1 (infrared sensor) (20VDC) Open (yellow LED ashing or steady) 20VDC K6 #1 (DBU) to K6 #3 (BR) 0VDC K6 #1 (DBU) to K6 #2 (W) 20VDC K6 #2 (W) to K6 #3 (BR)
K6 #3 Brown (BR)
K6 #2 White (W)
K6 #1 Dark Blue (DBU)
Fig. 1
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Red Positive Test Lead
3
20VDC
2 1
Black Negative Test Lead
Multimeter
• K6 Connector
BC1 (Infrared Sensor)
4) 5VDC Output Checks: CB K9 Connector: Control Switch (CB K9 #1 and #2) (open contacts for icemaking, closed contacts for drain), High-Pressure Switch (CB K9 #3 and #4), Compressor Control Relay/Gear Motor Protect Relay (K9 #5 and #6). CB K8 Connector: Bin Control (2) (K8 #3 and #4) and Float Switch (K8 #5 (common), #6 (lower), and #7 (upper)). When checking 5VDC control voltage, always place the red positive test lead from the multimeter to the CB white K5 pin closest to the CB red K4 connector. See Fig. 2. Then place the black negative test lead from the multimeter to the corresponding pin to complete the 5VDC check.
Red positive test lead to K5 pin closest to K4
connector
Red Positive Test Lead
5VDC
Multimeter
Black Negative Test Lead
Control Board K9 Connector
Control Switch white/black (W/BK)
High-Pressure Switch yellow (Y) wires
Compressor Control Relay/ Gear Motor Protect Relay (terminals #3 and #5)
white/orange (W/O)
Fig. 2
a) Control Switch – CB K9 #1 (W/BK) and CB K9 #2 (W/BK):
5VDC is present between CB white K5 connector, pin closest to CB red K4 connector and CB K9 #1 (W/BK) at all times. If 5VDC is not present, replace CB. When the control switch is in the "ICE" position, the control switch contacts are open. 0VDC is present between CB white K5 connector, pin closest to CB red K4 connector and CB K9 #2 (W/BK). When in the "ICE" position, 5VDC is present between CB K9 #1 (W/BK) to CB K9 #2 (W/BK). When the control switch is in the "DRAIN" position, the control switch contacts are closed. 5VDC is present between CB white K5 connector, pin closest to CB red K4 connector, to CB K9 #1 (W/BK) or#2(W/BK). If 5VDC is not present, replace CB. 0VDC is present from CB K9 #1(W/BK) to CB K9 #2 (W/BK).
b) High-Pressure Switch – CB K9 #3 (Y) and CB K9 #4 (Y):
5VDC is present between CB K5 connector, pin closest to CB red K4 connector and CB K9 #3 (Y) at all times. When the high-pressure switch is closed, 5VDC is present between CB K5 pin closest to CB K4 connector to CB K9 #3 (Y) and CB K9 #4 (Y). If 5VDC is not present, replace CB. When the high-pressure switch is closed, 0VDC is present at CB K9 #3 (Y) to CB K9 #4 (Y). When the high-pressure switch is open, 5VDC is present at CB K9 #3 (Y) to CB K9 #4 (Y). If the high-pressure switch is open and CB is not in alarm, replace CB. If5VDC is present at CB K9 #3 (Y) and not at CB K9 #4 (Y), the high-pressure switch is open and CB sounds a 3-beep alarm. Check continuity across the high-pressure switch (CB K9 #3 (Y) and CB K9 #4 (Y)).
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c) Compressor Control Relay/Gear Motor Protect Relay (CCR/GMPR) –
CB K9 #5(W/O) and CB K9 #6 (W/O): 5VDC is present from CB white K5 connector, pin closest to CB red K4 connector to CB K9 #5 (W/O) at all times. If 5VDC is not present, replace CB. When CCR/GMPR terminals #3 (W/O) and #5 (W/O) are open (CCR/GMPR de-energized), 5VDC is present between CB K9 #5 (W/O) and CB K9 #6 (W/O). When CCR/GMPR terminals #3(W/O) and #5 (W/O) are closed (CCR/ GMPR energized), 5VDC is present between CB K9 #5 (W/O) and CB K9 #6 (W/O). When CCR/GMPR terminals #3 (W/O) & #5 (W/O) are open CB may be in an 8-beep alarm. See "III.A.2. LED Lights and Audible Alarm Safeties."
d) Bin Control (2) (mechanical stand-alone or backup) –
CB K8 #3 (GY) and CB K8 #4(GY): 5VDC is present from CB white K5 connector, pin closest to CB red K4 connector to CB K8 #3 (GY) at all times. If 5VDC is not present, replace CB. When BC(2) is closed (calling for ice), 5VDC is present from CB white K5 connector, pin closest to CB red K4 connector, to CB K8 #3 (GY) and CB K8 #4(GY). If 5VDC is not present to either CB K8 #3 (GY) or CB K8 #4(GY), replace CB. If 5VDC is present at CB K8 #3 (GY) and not to CB K8 #4 (GY), BC(2) is open. See "II.D.2. Bin Control (2) (mechanical stand-alone or backup) Check."
e) Float Switch (LFS and UFS) – CB K8 #5 (BK) (common), CB K8 #6(R) (upper),
and CB K8 #7 (BU) (lower): 5VDC is present from CB white K5 connector pin closest to CB red K4 connector to CB K8 #5(BK) (common) at all times. If not, replace CB. 5VDC is present from CB white K5 connector pin closest to CB red K4connector to CB K8 #6 (R) (upper) and CB K8 #7 (BU) (lower) when FS is open. If 5VDC is present between CB K8 #5 (BK) and CB K8 #6 (R) (upper) or CB K8 #7 (BU) (lower), FS is open. Forfurther FS diagnostics, see "II.E. Float Switch Check and Cleaning."
5) Fill "WTRIN" LED is on: 24VAC is present at CB K2 #9 (W/R) at all times. If not, conrm 24VAC from CB K2 #9(W/R) to a neutral (LBU). When LFS open at startup or opens during normal operation, "WTRIN" LED turns on, ll timer (FT) starts, freeze timer (FZT) terminates (only during normal operation), and WV energizes. If LFS is open and "WTRIN" LED is off, conrm LFS status. See "II.E. Float Switch Check and Cleaning." If LFS is open and "WTRIN" LED is off, replace CB. If "WTRIN" LED is on and WV is not energized, check for 24VAC at CB K2 #8(O) to a neutral (LBU). If24VAC is not present at CB K2 #8(O), replace CB. "WTRIN" LED turns off once UFS closes. Ifnot, conrm UFS status. See "II.E. Float Switch Check and Cleaning." IfUFS is closed and "WTRIN" LED is on, replace CB. If "WTRIN" LED is off and WV is open, check for 24VAC at CB K2 #8 (O). If 24VAC is present at CB K2 #8 (O), replace CB. If24VAC is not present, check WV diaphragm.
6) Ice Purge Cycle "GM" LED is on: When UFS closes, GM delay timer starts (5 or 30sec. depending on CB S1 dip switch #7). Once GM delay timer terminates, "GM" LED turns on, GM and EH (-C model except FD-650) energize and 5-min. ice purge timer starts. If GM does not energize 30 sec. after UFS closes, conrm UFS status. See "II.E. Float Switch Check and Cleaning." If UFS is closed and GM LED does not turn, replace CB. If "GM" LED is on and GM and EH are off, check for 115VAC from CBK1#2to a neutral (W). If 115VAC is not present, check 115VAC power supply connections from power switch. If 115VAC is present, check for 115VAC from CB K1 #3to a neutral (W). If115VAC is present on CB K1 #2and not on CB K1 #3, replace CB.
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7) Freeze Cycle "GM" and "COMP" LED are on: The 5-min. ice purge timer terminates or the ice purge cycle bypass button ("SERVICE") is pressed, "COMP" LED turns on. 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. 115VAC is present between CB X1 relay power supply brown (BR) or black (BK) wire and neutral (W) at all times. If not, check 115VAC power supply wire connections from power switch. If"COMP" LED is not on after 5-min. ice purge timer terminates, replace CB. When "COMP" LED turns on, CR (if applicable) and compressor energize. If "COMP" LED is on and compressor relay (CR) (if applicable) and compressor are not, check for 115VAC from CB X1 relay power supply brown (BR) or black (BK) wire to neutral (W). If 115VAC is present, check X1 relay red (R), violet (V), or brown (BR) to neutral (W). If 115VAC is present on X1 relay brown (BR) or black (BK) and not on X1 relay red (R), violet (V), or brown (BR), replace CB.
8) Rell "WTRIN" LED is on: See "5) Fill "WTRIN" LED is on:" above.
Legend: BC1–bin control 1 (infrared sensor); BC(2)–bin control (2) (mechanical stand-alone
or backup); CB–control board; CR–compressor relay; CCR/GMPR–compressor control relay/gear motor protect relay; EH–evaporator heater (-C model except FD-650); FS–oat switch; GM–gear motor; LFS–lower oat switch; UFS–upper oat switch; WV–inlet water valve
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Control Board
• K9 Connector (5VDC)
• "COMP" LED (X1 Relay)
• "GM" LED (X2 Relay)
GM
• K1 Connector
(115VAC)
GM, CCR/GMPR, EH, FM, FMR #3 115VAC Input #2
• "FLUSH" LED
(X3 Relay) (drain)
DV
• "WTRIN" LED
(X4 Relay)
WV
Comp, LLV, SLV
• K2 Connector
(24VAC)
Drain Valve #10 (W/BU)
Control Transformer 24VAC Input #9 (white/red)
Inlet Water Valve #8 (O)
Control Switch #1 to #2 (white/black)
High-Pressure Switch #3 to #4 (yellow)
Compressor Control Relay Circuit/Gear Motor Protect Relay Circuit #5 to #6 (white/orange)
• S2 "SERVICE" Button (Ice Purge Cycle Bypass)
• K8 Connector
(24VAC and 5VDC)
Control Transformer 24VAC Input #1 (white/red)
Control Transformer 24VAC Neutral #2 (light blue)
(DRAIN)
Bin Control (2) (mechanical) #3 & #4 (gray) (5VDC)
Float Switch-Common #5 (black) (5VDC)
Upper Float Switch #6 (red) (5VDC)
2A8054-01
Lower Float Switch #7 (blue) (5VDC)
Control Transformer 24VAC Input #7 (white/red)
Water Dispensing Valve, Agitation Motor, and Ice Dispensing LEDs (not used on these models)
5VDC common terminals
• K3 Connector-Open
• K4 Connector-Open
• K5 Connector-Open
• J2 Connector-Open
Control Board
Part Number
Fig. 3
29
• K7 Connector-Open
• "POWER OK" LED
• S1 Dip Switch
3 2 1
• K6 Connector (20VDC) Bin Control 1 (infrared sensor) (dark blue) (white) (brown)
2A8054-01

D. Bin Control Check

1. Bin Control 1 (infrared sensor) Check
IMPORTANT
Make sure CB S1 dip switch 7 is in the "ON" position. This allows the control board to monitor BC1 (infrared sensor) along with BC2 (mechanical) backup bin control.
1) Turn off the power supply.
2) Remove the front panel, top panel, and control box cover.
3) Conrm that CB S1 dip switch 1, 2, 3 are in the proper position for your application. See "III.B.2. BC1 (Infrared Sensor) Shutdown Delay (S1 dip switch 1, 2, 3)."
4) Conrm that BC1 is connected to CB K6 connector. Wipe down BC1 lens with a warm, clean, damp cloth. If the bottom of the icemaker is not accessible in your application, remove the thumbscrew securing the BC1 housing, then remove the housing from the base. See Fig. 4.
5) Move the control switch to the "ICE" position, then move the power switch to the "ON" position.
6) Turn on the power supply to start the automatic icemaking process. Check that BC1 green LED is on. The BC1 green LED conrms 20VDC power from CB to BC1 and remains on constantly. Diagnosis: If the BC1 green LED is not on, conrm 20VDC at CB K6 #1 (DBU) to CB K6 #3 (BR). If 20VDC is present and the BC1 green LED is off, replace BC1. If not, see step "3) BC1 (infrared sensor) Power Supply," under "II.C. Control Board Check.
7) Make sure CB "GM" LED is on. There is a delay of at least 30 sec. before the "GM" LED turns on after power-up. After CB "GM" LED turns on, press CB "SERVICE" button to bypass the 5-min. ice purge cycle. WARNING! Risk of electric shock. Care should be
taken not to touch live terminals.
BC1 (infrared sensor)
Connector
LEDs
Thumbscrew
Housing
Lens
(20VDC from K6 connector on control board)
Housing
LEDs
Lens
Fig. 4
30
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