Hoshizaki KML-451MAH, Service Manual

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2. Evaporator is Frozen Up
Problem Possible Cause Remedy
[1]Freeze cycle time is
too long.
a)Float Switch 1. Leads short-circuit or
defective switch.
1. Check and replace.
2. Float does not move
freely.
2. Clean or replace.
b)Inlet Water Valve 1. Diaphragm does not
close.
1. Check for water leaks with
icemaker off.
c) Control Board 1. Defective. 1. See "II.C.4. Control Board
Check Procedure."
[2]All ice formed on
evaporator does not
fall into bin in harvest
cycle.
a)Evaporator 1. Scaled up. 1. Clean.
b)Water Supply Line 1. Water pressure too
low.
1. Check and get
recommended pressure.
c) Water Filter System 1. Dirty/Restricted 1. Replace filter.
d)Inlet Water Valve 1. Dirty mesh filter or
orifice.
1. Clean.
2. Diaphragm does not
close.
2. Check for water leaks with
icemaker off.
e) Ambient and/or water
temperature.
1. Too cool. 1. Increase temperature.
f) Line Valve
(if applicable)
1. Continues to open in
harvest cycle.
1. Check operation in harvest
cycle and replace.
g)Thermistor 1. Out of position or
loose attachment.
1. See "V.I. Removal
and Replacement of
Thermistor."
h)Control Board 1. Harvest timer is set
too short.
1. Adjust longer, referring
to "II.C.3. Controls and
Adjustments, b) Harvest
Timer."
2. Defective. 2. See "II.C.4. Control Board
Check Procedure."
[3]Other a)Spray Tubes 1. Clogged. 1. Clean
2. Out of position. 2. Place in position.
b)Water System 1. Dirty. 1. Clean.
c) Refrigerant 1. Undercharged. 1. Check for leaks and
recharge.
d)Expansion Valve 1. Bulb out of position or
loose attachment.
1. Place in position.
2. Defective. 2. Replace.
e)Hot Gas Valve 1. Coil winding opened. 1. Replace.
2. Plunger does not
move.
2. Replace.
3. Wiring to hot gas
valve.
3. Check for loose
connection or open, and
replace.
f) Ice Cube Guide 1. Out of position and ice
trapped.
1. Place in position.