Hoshizaki KM-901MWH - Manual (Page 66)

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