Low Ice Production; Abnormal Ice; Other - Hoshizaki KMD-900MRH Service Manual

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.

5. Other

Problem
[1] Icemaker will not
stop when bin is filled
with ice.
[2] Abnormal noise.
[3] Ice in storage bin
often melts.
Possible Cause
a) See chart 1.[3] and check high pressure control and water regulator.
b) See chart 2.[1] and check float switch, water solenoid valve and controller board.
a) See chart 2.[2] and check evaporator, water supply line, water solenoid valve,
ambient and/or water temperature, line valve, thermistor, and controller board.
Possible Cause
a) Ice Cube Guide
b) See chart 1.[5] and check water supply line, water solenoid valve, water system,
pump motor, and controller board.
c) Drain Valve
a) See chart 2.[1] and 2.[3], and check float switch, water solenoid valve, controller
board, spray tubes, water system, refrigerant charge, and expansion valve.
b) Spray Guide
c) Water Quality
Possible Cause
a) Bin Control
a) Pump Motor
b) Fan Motor
c) Compressor
d) Refrigerant Lines
a) Bin Drain
1. Out of position. Circulated
water falls into bin.
1. Dirty.
1. Dirty.
1. High hardness or contains
impurities.
1. Bearings worn out.
1. Bearings worn out.
2. Fan blade deformed.
3. Fan blade does not move
freely.
1. Bearings worn out or
cylinder valve broken.
2. Mounting pad out of
position.
1. Rub or touch other lines or
surfaces.
1. Plugged.
56
Remedy
Remedy
1. Place in position.
1. Clean.
1. Clean.
1. Install a water softener or
filter.
Remedy
1. See "II.3.[c]
Troubleshooting."
1. Replace.
1. Replace.
2. Replace fan blade.
3. Replace.
1. Replace.
2. Reinstall.
1. Replace.
1. Clean.