Hoshizaki KM-901MWH - Manual (Page 64)

64
Problem Possible Cause Remedy
[1]Freeze cycle time is
too long. (continued)
f) Thermistor 1. Disconnected, loose,
or defective.
1. Connect, secure, check.
See "V.L. Removal
and Replacement of
Thermistor."
g) Refrigerant 1. Low charge. 1. Check for leaks. Recover,
repair, evacuate, and
recharge.
h) Expansion Valve 1. Bulb loose. 1. Secure bulb.
2. Operating erratically. 2. Check and replace.
i) Control Board 1. Defective. 1. See "IV.B. Control Board
Check."
[2]All ice formed on
evaporator does not
fall into bin in harvest
cycle.
a) Evaporator 1. Scaled up. 1. Clean.
2. Damaged. 2. Replace.
b) Ambient and/or Water
Temperature
1. Too cool. 1. Increase temperature.
c) Water Supply Line 1. Water pressure too
low.
1. Check and get
recommended pressure.
d) 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.
e) Inlet Water Valve 1. Dirty mesh filter or
orifice.
1. Clean.
2. Diaphragm does not
close.
2. Check for water leaks with
icemaker off.
f) Spray Tubes 1. Dirty. 1. Clean.
2. Out of position. 2. Place in position.
g) Thermistor 1. Disconnected, loose,
or defective.
1. Connect, secure, check.
See "V.L. Removal
and Replacement of
Thermistor."
h) Hot Gas Valve 1. Coil winding open. 1. Replace.
2. Plunger does not
move.
2. Replace.
3. Wiring to hot gas
valve.
3. Check for loose
connection or open, and
replace.
i) Expansion Valve 1. Bulb loose. 1. Secure bulb.
2. Operating erratically. 2. Check and replace.
j) Liquid Line Valve
(if applicable)
1. Continues to open in
harvest cycle.
1. Check operation in harvest
cycle and replace.
k) Control Board 1. Harvest timer is set
too short.
1. Adjust longer, referring to
"II.C.3.b) Harvest Timer
(S4 dip switch 1 & 2)."
2. Defective. 2. See "IV.B. Control Board
Check."