Abnormal Ice - Hoshizaki KM-901MAH Service Manual

Problem
[1] Freeze cycle time is
long. (continued)
[2] Harvest cycle time is
long.

4. Abnormal Ice

Problem
[1] Small cubes.
Possible Cause
n) Control Board
a) Water Supply
b) Thermistor
c) Control Board
d) Inlet Water Valve
e) Evaporator
f) Hot Gas Valve
g) Expansion Valve
h) Water Regulating Valve
(water-cooled model)
i) Liquid Line Valve (if
applicable)
Possible Cause
a) Pump-Out Check Valve 1. Dirty or worn and
b) Ice Cube Guide
c) Water System
d) Inlet Water Valve
e) Pump Motor
f) Control Board
1. Float switch
connection loose (K5).
2. Defective.
1. Water temperature too
cold.
1. Disconnected, loose,
or defective.
1. Not reading
thermistor.
2. Sending voltage to
liquid line valve (if
applicable) in harvest.
1. Clogged.
1. Scaled up.
2. Damaged.
1. Does not open, or
opens partially.
1. Wide open in harvest. 1. Check and replace.
2. Bulb loose.
1. Open during harvest.
1. Open during harvest
cycle.
leaking by.
1. Out of position.
Circulated water falls
into bin.
1. Water supply line too
small; requires 3/8"
OD line dedicated per
machine.
2. Water filter clogged or
flow rate too small.
1. Dirty mesh filter or
orifice.
1. RPM too slow.
1. Defective.
66
Remedy
1. Check and reconnect.
2. See "IV.B. Control Board
Check."
1. Increase temperature.
1. Connect, secure, check.
See "V.L. Removal
and Replacement of
Thermistor" and "IV.E.
Thermistor Check."
1. Check and replace. See
"IV.E. Thermistor Check."
2. Check and replace. See
"IV.B. Control Board
Check."
1. Clean or replace.
1. Clean.
2. Replace.
1. Check and replace.
2. Secure bulb.
1. Adjust or replace. See
"V.J. Adjustment of Water
Regulating Valve."
1. Check and replace.
Remedy
1. Clean or replace.
1. Place in position.
1. Increase water line size.
2. Replace filter or install a
higher flow rate filter.
1. Clean.
1. See chart 1.[5].
1. See "IV.B. Control Board
Check."