Hoshizaki KMD-450MAH Service Manual page 44

Problem
[4] Water continues to
be supplied in freeze
cycle.
[5] Pump motor will not
start.
[6] Freeze cycle time is
too short.
[7] Fan motor will
not start, or is not
operating (except
water-cooled model).
[8] All components
run, but no ice is
produced.
Possible Cause
a) Water Pressure
b) Inlet Water Valve
c) Control Board
a) Pump Motor
b) Control Board
c) Control Switch
a) Drain Valve
b) Float Switch
c) Control Board
d) Water System
a) Fan Motor
b) Control Board
a) Refrigerant
b) Compressor
c) Hot Gas Valve
d) Liquid Line Valve
(if applicable)
e) Inlet Water Valve
f) Expansion Valve
1. Too high.
1. Diaphragm does not
close.
1. Defective.
1. Motor winding open.
2. Bearing worn out.
3. Wiring to pump motor. 3. Check for loose
4. Defective capacitor.
5. Defective or bound
impeller.
1. Defective.
1. Bad contacts.
1. Leaking by.
1. Dirty or erratic
operation.
1. Defective.
1. Water leaks.
1. Motor winding open.
2. Bearing worn out.
3. Wiring to fan motor.
4. Defective capacitor.
5. Fan blade bound.
1. Defective.
1. Low charge.
2. Air or moisture
trapped.
1. Defective.
1. Continues to open in
freeze cycle.
1. Continues to close in
freeze cycle.
1. Inlet water valve is
wide open during
freeze.
1. Bulb loose.
2. Operating erratically.
44
Remedy
1. Reduce.
1. Check for water leaks with
icemaker off.
1. See "IV.B. Control Board
Check."
1. Replace.
2. Replace.
connection or open, and
replace.
4. Replace.
5. Replace and clean.
1. See "IV.B. Control Board
Check."
1. Replace.
1. Clean or replace.
1. See "IV.D. Float Switch
Check and Cleaning."
1. See "IV.B. Control Board
Check."
1. Check connections for
water leaks and repair.
1. Replace.
2. Replace.
3. Check for loose
connection or open, and
replace.
4. Replace.
5. Check and replace.
1. See "IV.B. Control Board
Check."
1. Check for leaks. Recover,
repair, evacuate, and
recharge.
2. Recover, replace drier,
evacuate, and recharge.
1. Replace.
1. Check and replace.
1. Check and replace.
1. Check for water leaks with
icemaker off.
1. Secure bulb.
2. Check and replace.