C) Low Ice Production; D) Abnormal Ice - Hoshizaki DKM-500BAH Service Manual

Problem

c) Low Ice Production

Problem
[1] Freeze cycle time is
long.
[2] Harvest cycle time is
long.

d) Abnormal Ice

Problem
[1] Small cubes.
[2] Cloudy or irregular
cubes.
Possible Cause
d) Expansion Valve
e) Hot Gas Valve
f) Ice Cube Guide
g) Water Supply Line
h) Water Filter
Possible Cause
a) See chart 1. a) [3] and check dirty air filter or condenser, ambient or water
temperature, water pressure, and refrigerant charge.
b) See chart 1. b) [1] and check float switch, inlet water valve and control board.
c) Check pump, hot gas valve, expansion valve, refrigeration check valve, and
compressor.
a) See chart 1. b) [2] and check control board, thermistor, evaporator, ambient
and/or water temperature, water supply line, inlet water valve, and hot gas
valve.
Possible Cause
a) Ice Cube Guide
b) See chart 1. a) [5] and check water supply line, inlet water valve, water system,
pump motor, and control board.
c) Drain Valve
a) See chart 1. b) [1] and 1. b) [3], and check float switch, inlet water valve, control
board, spray tubes, water system, refrigerant charge, and expansion valve.
b) Spray Guide
c) Water Quality
1. Bulb out of position or
loose attachment.
2. Defective.
1. Coil winding opened.
2. Plunger does not
move.
3. Wiring to hot gas
valve.
1. Out of position and ice
trapped.
1. Too small; requires
3/8" OD line dedicated
per machine.
1. Flow rate too small.
1. Out of position.
Circulated water falls
into bin.
1. Dirty.
1. Dirty.
1. High hardness or
contains impurities.
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Remedy
1. Place in position.
2. Replace.
1. Replace.
2. Replace.
3. Check for loose
connection or open, and
replace.
1. Place in position.
1. Increase water line size.
1. Replace with filter that has
larger flow rate.
Remedy
Remedy
1. Place in position.
1. Clean.
1. Clean.
1. Install a water softener or
filter.