Diagnostic Charts; No Ice Production - Hoshizaki KMD-450MAH Service Manual

F. Diagnostic Charts

1. No Ice Production

Problem
[1] The icemaker will not
start.
Possible Cause
a) Power Supply
b) Water Supply
c) Bin Control
d) Fuse (Control Box)
e) Control Switch
f) High Pressure Control
g) Transformer
h) Wiring to Control Board 1. Loose connections or
i) Thermistor
1. Off, blown fuse, or
tripped breaker.
2. Loose connection.
3. Bad contacts.
4. Not within
specifications.
1. Water supply off or
pressure too low.
1. Tripped with bin filled
with ice.
2. Defective.
1. Blown.
1. "OFF" or "SERVICE"
position.
2. Bad contacts.
1. Bad contacts.
2. Dirty air filter or
condenser.
3. Ambient or condenser
water temperature too
warm.
4. Refrigerant
overcharged.
5. Fan not operating
(except water-cooled
model).
6. Refrigerant lines or
components restricted.
7. Condenser water
pressure too low or off
(water-cooled model).
1. Coil winding open or
shorted.
open.
1. Leads shorted or open
and high temperature
or harvest backup
timer safety operates
(1 beep or 2 beep
alarm).
42
Remedy
1. Turn on, replace, or reset.
2. Tighten.
3. Check for continuity and
replace.
4. Refer to nameplate and
correct.
1. Check and get
recommended pressure.
1. Remove ice.
2. See "IV.C. Bin Control
Check."
1. Check for short circuit and
replace.
1. Move to "ICE" position.
2. Check for continuity and
replace.
1. Check for continuity and
replace.
2. Clean.
3. Reduce temperature.
4. Recover, evacuate, and
recharge.
5. See chart 1.[7].
6. Recover, repair, replace
drier, evacuate, and
recharge.
7. Check and get
recommended pressure.
1. Replace.
1. Check for continuity and
replace.
1. See "IV.E. Thermistor
Check."