Evaporator Is Frozen Up - Hoshizaki KM-320MAH Service Manual

Problem
[6] Fan motor will
not start, or is not
operating.
[7] All components
run, but no ice is
produced.
B. Evaporator is Frozen Up
Problem
[1]Freeze cycle time is
too long.
Possible Cause
d)Pump Motor
e)Controller Board
a)Fan Motor
b)Controller Board
a)Refrigerant
b)Compressor
c) Hot Gas Solenoid Valve 1. Continues to open in
d)Line Valve
e)Water Supply Line
(water-cooled model)
f) Water Solenoid Valve
Possible Cause
a) Float Switch
b) Water Solenoid Valve
1. Motor winding opened. 1. Replace.
2. Bearing worn out.
3. Wiring to pump motor. 3. Check for loose
4. Defective capacitor.
5. Defective or bound
impeller.
6. Mechanical seal worn
out.
1. Defective.
1. Motor winding opened. 1. Replace.
2. Bearing worn out.
3. Wiring to fan motor.
4. Defective capacitor.
5. Fan blade bound.
1. Defective.
1. Undercharged.
2. Air or moisture
trapped.
1. Defective valve.
freeze cycle.
1. Continues to close in
freeze cycle.
1. Condenser water
pressure too low or off
and pressure control
opens and closes
frequently.
1. Water solenoid valve
is wide open during
freeze.
1. Leads short-circuit or
defective switch.
2. Float does not move
freely.
1. Diaphragm does not
close.
31
Remedy
2. Replace.
connection or open, and
replace.
4. Replace.
5. Replace and clean.
6. Check and replace.
1. See "II.B.5. Checking the
Controller Board."
2. Replace.
3. Check for loose
connection or open, and
replace.
4. Replace.
5. Check and replace.
1. See "II.B.5. Checking the
Controller Board."
1. Check for leaks and
recharge.
2. Replace drier and
recharge.
1. Replace.
1. Check and replace.
1. Check and replace.
1. Check and get
recommended pressure.
1. Check for water leaks with
icemaker off.
Remedy
1. Check and replace.
2. Clean or replace.
1. Check for water leaks with
icemaker off.