Diagnostic Charts - Hoshizaki KM-901MAH Service Manual

F. Diagnostic Charts
1. No Ice Production
Problem
[1] The icemaker will not
start.
Possible Cause
a) Power Supply
b) Transformer (115V
primary) (3 phase only)
c) Water Supply
d) Thermostatic Bin
Control
e) Fuse (Control Box)
f) Control Switch
g) High Pressure Control
1. Off, blown fuse, or
tripped breaker.
2. Loose connection.
3. Bad contacts.
4. Not within
specifications.
1. Voltage tap switch
does not match
incoming voltage.
2. Coil winding open or
shorted.
1. Water supply off or
pressure too low.
1. Tripped with bin filled
with ice.
2. Ambient temperature
too cool.
3. Set too warm.
4. Bulb out of position.
5. Bad contacts.
1. Blown.
1. "OFF" or "WASH"
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).
60
Remedy
1. Turn on, replace, or reset.
2. Tighten.
3. Check for continuity and
replace.
4. Refer to nameplate and
correct.
1. Verify incoming voltage,
move switch to proper
setting.
2. Replace.
1. Check and get
recommended pressure.
1. Remove ice.
2. Increase ambient
temperature.
3. See "IV.C.1. Thermostatic
Bin Control Check."
4. Place in position.
5. Check for continuity and
replace.
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.