Hoshizaki KM-250BWF - Manual (Page 30)

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PROBLEM POSSIBLE CAUSE REMEDY
[1] Freeze cycle a) Float Switch 1. Leads short-circuit or 1. Check and replace.
time is too defective switch.
long. 2. Float does not move freely. 2. Clean or replace.
b) Water Solenoid 1. Diaphragm does not close. 1. Check for water leaks
Valve with icemaker off.
c) Controller Board 1. Defective. 1. See “II.2.[ e ] Checking the
Controller Board.”
[2] All ice formed a) Evaporator 1. Scaled up. 1. Clean.
on evaporator b) Water Supply Line 1. Water pressure too low. 1. Check and get
does not fall recommended pressure.
into bin in c) Water Solenoid 1. Dirty mesh filter or orifice. 1. Clean.
harvest cycle. Valve 2. Diaphragm does not close. 2. Check for water leaks
with icemaker off.
d) Ambient and/or 1. Too cool. 1. Increase temperature.
water temperature
e) Thermistor
1. Out of position or loose 1. See “V. 10. Removal
attachment. and Replacement
of Thermistor.”
f) Controller Board 1. Defrost timer is set too 1. Adjust longer, referring
short. to “II. 2. [d] Controls
and Adjustments,
2) Defrost Timer.”
2. Defective. 2. See "II.2.[e] Checking the
Controller Board."
[3] Others 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 1. Place in position.
loose attachment.
2. Defective.
2. Replace.
e) Hot Gas Solenoid 1. Coil winding opened. 1. Replace.
Valve 2. Plunger does not move. 2. Replace.
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 1. Increase water supply
line dedicated per machine line size.
g) Water Filter 1. Flow rate too small. 1. Replace with filter with
larger flow rate.
2. Evaporator is Frozen Up