Low Ice Production; Abnormal Ice - Hoshizaki KMD-901MWH Service Manual

Problem
[3]Other. (continued)

3. Low Ice Production

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

4. Abnormal Ice

Problem
[1] Small cubes.
[2] Cloudy or irregular
cubes.
Possible Cause
c) Refrigerant
d) Expansion Valve
e) Hot Gas Valve
f) Ice Cube Guide
Possible Cause
a) See chart 2.[1] and check float switch, inlet water valve, control board, water
pump, spray tubes, evaporator, and expansion valve.
b) See chart 1.[1] and check dirty air filter or condenser, ambient or water
temperature, refrigerant charge, water pressure, and condenser water
regulating valve (water-cooled model only).
c) Check pump, hot gas valve, headmaster (C.P.R.) (remote air-cooled model
only), expansion valve, refrigeration check valve, and compressor.
a) See chart 2.[2] and check evaporator, water supply line, inlet water valve,
ambient and/or water temperature, line valve (if applicable), thermistor, control
board, and hot gas valve.
Possible Cause
a) Ice Cube Guide
b) See chart 1.[5] and check water supply line, inlet water valve, water system,
pump motor, and control board.
c) Drain Valve
a) See chart 2.[1] and 2.[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. Low charge.
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. Out of position.
Circulated water falls
into bin.
1. Dirty.
1. Dirty.
1. High hardness or
contains impurities.
39
Remedy
1. Check for leaks and
recharge.
1. Place in position.
2. Replace.
1. Replace.
2. Replace.
3. Check for loose
connection or open, and
replace.
1. Place in position.
Remedy
Remedy
1. Place in position.
1. Clean.
1. Clean.
1. Install a water softener or
filter.