Service Diagnosis; No Ice Production - Hoshizaki KMD-900MRH Service Manual

IV. Service Diagnosis

1. No Ice Production

Problem
[1] The icemaker will not
start.
Possible Cause
a) Power Supply
b) Fuse (Inside fused
disconnect, if any)
c) Control Switch
d) Bin Control
e) High Pressure Control
f) Transformer
g) Wiring to Controller
Board
h) Thermistor
i) Hot Gas Solenoid
Valve
j) Water Supply Line
k) Water Solenoid
1. OFF position.
2. Loose connection.
3. Bad contacts.
4. Voltage too high.
1. Blown.
1. OFF position.
2. Bad contacts.
1. Bad contacts.
1. Thermal fuse blown or coil
winding opened.
1. Loose connections or
open.
1. Leads short-circuit or open
and high temperature
safety operates.
1. Continues to open in
freeze cycle and high
temperature safety
operates.
1. Water supply off and water
supply cycle does not
finish.
2. Condenser water pressure
too low or off and pressure
control opens and closes
frequently to finally
operate high temperature
safety.
1. Mesh filter or orifice gets
clogged and water supply
cycle does not finish.
2. Coil winding opened.
3. Wiring to water valve.
52
Remedy
1. Move to ON position.
2. Tighten.
3. Check for continuity and
replace.
4. Check and get
recommended voltage.
1. Check for short circuit and
replace.
1. Move to ICE position.
2. Check for continuity and
replace.
1. See "II.3.[c]
Troubleshooting."
1. Check for continuity and
replace.
1. Replace.
1. Check for continuity and
replace.
1. See "II.2.[d] Controls and
Adjustments, 1) Defrost
Control."
1. Check for power off in
freeze cycle and replace.
1. Check and get
recommended pressure.
2. Check and get
recommended pressure.
1. Clean.
2. Replace.
3. Check for loose
connection or open, and
replace.