Hoshizaki KM300BAJ User Manual

Ser vice Manual
Self-Contained Crescent Cuber
Models KM-230BAJ KM-300BAJ, BWJ
hoshizakiamerica.com
Number: F111-1006 Issued: 03-15-2018
G. Diagnostic Tables
1. No Ice Production
PROBLEM POSSIBLE CAUSE REMEDY
[1] The icemaker
will not start.
a) Power Supply 1. OFF position. 1. Move to ON position.
2. Loose connections. 2. Tighten.
3. Bad contacts. 3. Check for continuity and replace.
4. Voltage too high. 4. Check and get recommended voltage.
5. Unplugged. 5. Plug in.
b) Fuse (inside fused
disconnect, if any)
c) Control Switch 1. OFF or SERVICE position. 1. Move to ICE position.
d) Bin Control Switch 1. Tripped with bin filled with
e) High Pressure
Control
f) Transformer 1. Thermal fuse blown or coil g) Wiring to Control
Board
h) Thermistor 1. Leads shorted or open and
i) Hot Gas Solenoid
Valve
j) Water Supply Line 1. Water supply off and water
k) Inlet Water Valve 1. Mesh filter or orifice gets
l) Control Board 1. Defective. 1. See “II.C. Control Board
1. Blown. 1. Check for short circuit and replace.
2. Bad contacts. 2. Check for continuity and replace.
1. Remove ice.
ice.
2. Defective reed switch. 2. Check for continuity and replace.
1. Bad contacts. 1. Check for continuity and replace.
1. Replace.
winding open.
1. Loose connections or open. 1. Check for continuity and replace.
1. See “II.F. Thermistor high temperature safety operates. If open, unit will start but have long harvest cycle.
1. Continues to open in freeze cycle and high temperature safety operates.
supply cycle does not finish.
2. Condenser water pressure too low or off and high pressure control opens and closes frequently (water-cooled model).
clogged and water supply cycle does not finish.
2. Coil winding open. 2. Replace.
3. Wiring to water valve. 3. Check for loose
Check”.
1. Check for power off in freeze cycle and replace.
1. Check and get recommended pressure. Check for water supply.
2. Check and get recommended pressure.
1. Clean. Replace if necessary.
connection or open, and replace.
Check”.
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PROBLEM POSSIBLE CAUSE REMEDY
[2] Water
continues to be supplied, and the icemaker will not start.
[3] Compressor
will not start or operates intermittently.
a) Float Switch 1. Connector disconnected. 1. Reconnect.
2. Leads open or defective
2. Check and replace.
switch.
3. Float does not move freely. 3. Clean or replace. b) Control Board 1. Defective. 1. Replace. a) Control Switch 1. SERVICE position. 1. Move to ICE position.
2. Bad contacts. 2. Check and replace. b) High Pressure
Control
1. Dirty air filter or condenser. 1. Clean.
2. Ambient temperature too
warm.
2. Reduce ambient temperature.
3. Refrigerant overcharged. 3. Recharge.
4. Fan not operating. 4. See chart 1 - [6].
5. Condenser water pressure too low or off (water-cooled
5. Check and get recommended pressure.
model).
6. Condenser water temperature too warm (water-cooled model).
7. Refrigerant line or
6. Check and get recommended temperature.
7. Clean and replace drier.
components plugged.
c) Overload
Protector
1. Bad contacts. 1. Check for continuity and replace.
2. Voltage too low. 2. Increase voltage.
3. Refrigerant overcharged or
3. Recharge.
undercharged.
d) Starter 1. Bad contacts. 1. Check and replace.
2. Coil winding open. 2. Replace.
e) Start Capacitor 1. Defective. 1. Replace. f) Power Relay 1. Bad contacts. 1. Check for continuity and
replace.
2. Coil winding open. 2. Replace.
g) Compressor 1. Wiring to compressor. 1. Check for loose
connection or open, and replace.
2. Defective. 2. Replace.
3. Protector tripped. 3. Reduce temperature and verify cause.
h) Control Board 1. Defective. 1. See “II.C. Control Board
Check”.
i) Condenser, Air
1. Clogged with dirt and dust. 1. Clean and unclog.
Filter
j) Water Regulating
Valve
1. Set too high. 1. Adjust lower.
2. Clogged or defective. 2. Clean or replace.
(water-cooled model)
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PROBLEM POSSIBLE CAUSE REMEDY
[4] Water
continues to be supplied in freeze cycle.
a) Inlet Water Valve 1. Diaphragm does not close. 1. Check for water leaks
with icemaker off. Replace if necessary.
b) Control Board 1. Defective. 1. See “II.C. Control Board
Check”.
[5] No water
comes from Spray Tubes. Water Pump will not start, or freeze cycle time is too short.
a) Water Supply Line 1. Water pressure too low and
water level in water tank too
1. Check and get recommended pressure.
low.
b) Inlet Water Valve 1. Dirty mesh filter or orifice
1. Clean.
and water level in water tank too low.
c) Water System 1. Water leaks. 1. Check connections for
water leaks, and replace.
2. Clogged. 2. Clean.
d) Pump Motor 1. Motor winding open. 1. Replace.
2. Bearing worn out. 2. Replace.
3. Wiring to pump motor. 3. Check for loose connection or open, and replace.
4. Defective capacitor. 4. Replace.
5. Defective or bound impeller. 5. Replace and clean.
e) Control Board 1. Defective. 1. See “II.C. Control Board
Check”.
[6] Fan Motor will
not start, or is not operating.
a) Fan Motor 1. Motor winding open. 1. Replace.
2. Bearing worn out. 2. Replace.
3. Wiring to fan motor. 3. Check for loose connection or open, and replace.
4. Fan blade bound (locked fan
4. Check and replace.
motor).
b) Control Board 1. Defective. 1. See “II.C. Control Board
Check”.
[7] All
components run but no ice is produced.
a) Refrigerant 1. Undercharged. 1. Check for leaks and
recharge.
2. Air or moisture trapped. 2. Replace drier, and recharge.
b) Compressor 1. Defective. 1. Replace. c) Hot Gas Solenoid
Valve
1. Continues to open in freeze
cycle.
1. Check and replace.
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2. Freeze-Up
Defrost and clean the icemaker prior to diagnosing freeze-up. Fill out a freeze-up check list. See the Hoshizaki America Technician’s Pocket Guide or contact your local distributor for a copy of the freeze-up checklist.
PROBLEM POSSIBLE CAUSE REMEDY
[1] Freeze cycle
time is too long.
[2] All ice formed
on Evaporator does not fall into bin in harvest cycle.
[3] Others a) Spray Tubes 1. Clogged. 1. Clean.
a) Float Switch 1. Leads shorted or defective
switch.
2. Float does not move freely. 2. Clean or replace.
b) Inlet Water Valve 1. Diaphragm does not close. 1. Check for water leaks
c) Control Board 1. Defective. 1. See “II.C. Control Board a) Evaporator 1. Scaled up. 1. Clean.
b) Water Supply Line 1. Water pressure too low. 1. Check and get c) Inlet Water Valve 1. Dirty mesh filter or orifice. 1. Clean.
2. Diaphragm does not close. 2. Check for water leaks
d) Ambient and/or
water temperature
e) Thermistor 1. Out of position or loose f) Control Board 1. Harvest timer is set too
b) Water System 1. Dirty. 1. Clean. c) Refrigerant 1. Undercharged. 1. Check for leaks and
d) Expansion Valve 1. Bulb out of position or loose
e) Hot Gas Solenoid
Valve
f) Water Supply Line 1. Too small; requires minimum
g) Water Filter 1. Flow rate too small. 1. Replace with filter that
1. Too cool. 1. Increase temperature.
attachment. short.
2. Defective. 2. See “II.C. Control Board
2. Out of position. 2. Place in position.
attachment.
2. Defective. 2. Replace.
1. Coil winding open. 1. Replace.
2. Plunger does not move. 2. Replace.
3. Wiring to hot gas valve. 3. Check for loose
1/4" nominal ID copper water tubing or equivalent line dedicated per machine.
1. Check and replace.
with icemaker off. Replace if necessary.
Check”.
recommended pressure.
with icemaker off. Replace if necessary.
1. See “II.F. Thermistor Check”.
1. Adjust longer, referring to “III.C.2 Harvest Timer”.
Check”.
recharge.
1. Place in position.
connection or open, and replace.
1. Increase water supply line size.
has larger flow rate.
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3. Low Ice Production
PROBLEM POSSIBLE CAUSE REMEDY
[1] Freeze cycle
time is long.
[2] Harvest cycle
time is long.
a) See chart 1 - [3] and check dirty air filter or condenser, ambient or water
temperature, water pressure, water regulating valve (water-cooled model), and
refrigerant charge. b) See chart 2 - [1] and check float switch, inlet water valve, and control board. a) See chart 2 - [2] and check control board, thermistor, evaporator, ambient and/or
water temperature, water supply line, and inlet water valve.
4. Abnormal Ice
PROBLEM POSSIBLE CAUSE REMEDY
[1] Small cubes a) Cube Guide,
Water Tank
b) See chart 1 - [5] and check water supply line, inlet water valve, water system,
pump motor, and control board.
[2] Cloudy or
irregular cubes
a) See chart 2 - [1] and - [3] and check float switch, inlet water valve, control board,
spray tubes, water system, refrigerant charge and expansion valve. b) Spray Guide 1. Dirty. 1. Clean. c) Water Quality 1. High hardness or contains
1. Out of position. Circulated water falls into bin.
impurities.
1. Check that cube guide is properly installed on water tank and tank is fixed securely with snaps.
1. Install a water filter or softener.
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5.
Other
PROBLEM POSSIBLE CAUSE REMEDY
[1] Icemaker will
not stop when bin is filled with ice.
[2] Abnormal
noise
[3] Ice in Storage
Bin often melts.
a) Bin Control Switch 1. Completely disconnected
and dropped inside bin.
2. Detector broken. 2. Replace.
3. Detector out of position. 3. Place in position.
4. Defective reed switch. 4. Check for continuity and
5. Reed switch out of position. 5. Place in position.
6. Magnet disconnected from detector.
b) Control Board 1. Defective. 1. See “II.C. Control Board a) Pump Motor 1. Bearings worn out. 1. Replace.
b) Fan Motor 1. Bearings worn out. 1. Replace.
2. Fan blade deformed. 2. Replace fan blade.
3. Fan blade does not move freely.
c) Compressor 1. Bearings worn out, or
cylinder valve broken.
2. Mounting pad out of position or loose hold-down bolt.
d) Refrigerant Lines 1. Rub or touch lines or other
surfaces.
a) Bin Drain 1. Plugged. 1. Clean.
1. Place in position.
replace.
6. Place in position.
Check”.
3. Replace.
1. Replace.
2. Reinstall.
1. Reposition.
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