Hoshizaki KM-501MAH User Manual

38

[]Freeze cycle time is 

too long.

a)Float Switch

. Leads short-circuit or 

defective switch.

. Check and replace.

. Float does not move 

freely.

. Clean or replace.

b)Inlet Water Valve

. Diaphragm does not 

close.

. Check for water leaks with 

icemaker off.

c) Control Board

. Defective.

. See "II.C.4. Control Board 

Check Procedure."

[]All ice formed on 

evaporator does not 
fall into bin in harvest 
cycle.

a)Evaporator

. Scaled up.

. Clean.

b)Water Supply Line

. Water pressure too 

low.

. Check and get 

recommended pressure.

c) Water Filter System

. Dirty/Restricted

. Replace filter.

d)Inlet Water Valve

. Dirty mesh filter or 

orifice.

. Clean.

. Diaphragm does not 

close.

. Check for water leaks with 

icemaker off.

e) Ambient and/or water 

temperature.

. Too cool.

. Increase temperature.

f) Line Valve

. Continues to open in 

harvest cycle.

. Check operation in harvest 

cycle and replace.

g)Thermistor

. Out of position or 

loose attachment.

. See "V.I. Removal 

and Replacement of 
Thermistor."

h)Control Board

. Harvest timer is set 

too short.

. Adjust longer, referring 

to "II.C.3. Controls and 
Adjustments, c) Harvest 
Timer. 

. Defective.

. See "II.C.4. Control Board 

Check Procedure."

[3]Other

a)Spray Tubes

. Clogged.

. Clean

. Out of position.

. Place in position.

b)Water System

. Dirty.

. Clean.

c) Refrigerant

. Undercharged.

. Check for leaks and 

recharge.

d)Expansion Valve

. Bulb out of position or 

loose attachment.

. Place in position.

. Defective.

. Replace.

e)Hot Gas Valve

. Coil winding opened. . Replace.
. Plunger does not 

move.

. Replace.

3. Wiring to hot gas 

valve.

3. Check for loose 

connection or open, and 
replace.

f) Ice Cube Guide

. Out of position and ice 

trapped.

. Place in position.