No Ice Production - Hoshizaki KM-40B Service Manual

2. 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
Switch
e) High Pressure
Control
(KM-80B only)
f) Transformer
g) Wiring to Control
Board
h) Thermistor
i) Hot Gas Solenoid
Valve
j) Water Supply Line
k) Inlet Water Valve
l) Control Board
1. OFF position.
2. Loose connections.
3. Bad contacts.
4. Voltage too high.
5. Unplugged.
1. Blown out.
1. OFF position.
2. Bad contacts.
1. Tripped with bin filled
with ice.
2. Defective reed switch.
1. Bad contacts.
1. Thermal fuse blown out
or coil winding opened.
1. Loose connections or
open.
1. Leads shorted or open
and High Temperature
Safety operates. If
open, unit will start but
have long defrost cycle.
1. Continues to open in
freeze cycle and High
Temperature Safety
operates.
1. Water supply off and
water supply cycle does
not finish.
1. Mesh filter or orifice
gets clogged and water
supply cycle does not
finish.
2. Coil winding opened.
3. Wiring to Water Valve.
1. Defective.
38
REMEDY
1. Move to ON position.
2. Tighten.
3. Check for continuity and
replace.
4. Check and get
recommended voltage.
5. Plug in.
1. Check for short circuit
and replace.
1. Move to ICE position.
2. Check for continuity and
replace.
1. Remove ice.
2. Check for continuity and
replace.
1. Check for continuity and
replace.
1. Replace.
1. Check for continuity and
replace.
1. See "II. 4.
THERMISTOR".
1. Check for power off in
freeze cycle and replace.
1. Check and get
recommended pressure.
Check for water supply.
1. Clean. Replace if
necessary.
2. Replace.
3. Check for loose
connection or open, and
replace.
1. See "II. 3. [d] CONTROL
BOARD CHECK
PROCEDURE".