Hoshizaki KM-151BAH - Manual (Page 39)

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3. EVAPORATOR IS FROZEN UP
PROBLEM POSSIBLE CAUSE REMEDY
1. Leads shorted or
defective switch.
1. Check and replace. a) Float 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
with icemaker off.
Replace if necessary.
[1] Freeze cycle
time is too
long.
c) Control Board 1. Defective. 1. See “II. 3. [d] CONTROL
BOARD CHECK
PROCEDURE”.
a) Evaporator 1. Scaled up. 1. Clean.
b) Water Supply Line 1. Water pressure too low. 1. Check and get
recommended pressure.
1. Dirty mesh filter or
orifice.
1. Clean. c) Inlet Water Valve
2. Diaphragm does not
close.
2. Check for water leaks
with icemaker off.
Replace if necessary.
d) Ambient and/or
water temperature
1. Too cool. 1. Increase temperature.
e) Thermistor 1. Out of position or loose
attachment.
1. See “V. 14.
THERMISTOR”.
1. Harvest Timer is set too
short.
1. Adjust longer, referring to
“II. 4. HARVEST
CONTROL -
THERMISTOR”.
[2] All ice formed
on Evaporator
does not fall
into bin in
harvest cycle.
f) Control Board
2. Defective. 2. See “II. 3. [d] CONTROL
BOARD CHECK
PROCEDURE”.
1. Clogged. 1. Clean. a) Spray Tubes
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.
1. Bulb out of position or
loose attachment.
1. Place in position. d) Expansion Valve
(KM-151 only)
2. Defective. 2. Replace.
1. Coil winding opened. 1. Replace.
2. Plunger does not move. 2. Replace.
e) Hot Gas Solenoid
Valve
3. Wiring to Hot Gas
Valve.
3. Check for loose
connection or open, and
replace.
f) Water Supply Line 1. Too small; requires 3/8”
OD line dedicated per
machine.
1. Increase water supply line
size.
[3] Others
g) Water Filter 1. Flow rate too small. 1. Replace with filter that
has larger flow rate.