Service Diagnosis; No Ice Production - Hoshizaki KM-500MAH Service Manual

IV. SERVICE DIAGNOSIS

1. NO ICE PRODUCTION

PROBLEM
[1] The icemaker a) Power Supply
will not start
b) Fuse (Inside Fused
c) Control Switch
d) Bin Control
For mechanical
bin control
see "II. 3. [c]"
e) High Pressure
f) Transformer
g) Wiring to
h) Thermistor
i) Hot Gas Solenoid
Valve
j) Water Supply Line
k) Water Solenoid
POSSIBLE CAUSE
Disconnect, if any)
Thermostat
Control
Controller Board
1. "OFF" position.
2. Loose connections.
3. Bad contacts.
4. Voltage too high.
1. Blown out.
1. "OFF" position.
2. Bad contacts.
1. Tripped with bin filled
with ice.
2. Ambient temperature
too cool.
3. Set too warm.
4. Bulb out of position.
5. Bad contacts or leaks
bulb.
1. Bad contacts.
1. Thermal fuse blown out
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.
41
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. Remove ice.
2. Increase ambient
temperature.
3. See "II.2.[d]
CONTROLS AND
ADJUSTMENTS, 5) Bin
Control."
4. Place in position.
5. Check for continuity and
replace.
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.