Low ice production, Evaporator is frozen up – Hoshizaki KML "F" SERIES User Manual
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3. LOW ICE PRODUCTION
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
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. 11. 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 ADJUSTMENT, 2)
Defrost Timer.”
2. Defective.
2. See “II. 2.[e] CHECKING
CONTROLLER BOARD.”
[3] Others
a) Spray Tube
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.
2. EVAPORATOR IS FROZEN UP
PROBLEM
POSSIBLE CAUSE
REMEDY
[1] Freeze cycle
a) See chart 1 - [3], and check dirty Air Filter or Condenser, ambient or water
time is long.
temperature, water pressure, Water Regulator or refrigerant charge.
b) See chart 2 - [1], and check Float Switch, Water Solenoid Valve or Controller
Board.
[2] Harvest cycle
a) See chart 2 - [2], and check Controller Board, Thermistor, Evaporator, ambient
time is long
and/or water temperature, water supply line, Water Solenoid Valve.