Hoshizaki KM-901MWH - Manual (Page 63)

63
Problem Possible Cause Remedy
[7] Fan motor will
not start, or is not
operating (except
water-cooled model).
a) Fan Motor 1. Motor winding open. 1. Replace.
2. Bearing worn out. 2. Replace.
3. Wiring to fan motor. 3. Check for loose connection
or open, and replace.
4. Defective capacitor. 4. Replace.
5. Fan blade bound. 5. Check and replace.
b) Control Board 1. Defective. 1. See "IV.B. Control Board
Check."
[8] All components
run, but no ice is
produced.
a) Refrigerant 1. Low charge. 1. Check for leaks. Recover,
repair, evacuate, and
recharge.
2. Air or moisture
trapped.
2. Recover, replace drier,
evacuate, and recharge.
b) Compressor 1. Defective. 1. Replace.
c) Hot Gas Valve 1. Continues to open in
freeze cycle.
1. Check and replace.
d) Liquid Line Valve
(if applicable)
1. Continues to close in
freeze cycle.
1. Check and replace.
e) Inlet Water Valve 1. Inlet water valve is
wide open during
freeze.
1. Check for water leaks with
icemaker off.
f) Expansion Valve 1. Bulb loose. 1. Secure bulb.
2. Operating erratically. 2. Check and replace.
g) Headmaster (C.P.R.)
(remote condenser
unit)
1. Not operating properly
and liquid line
temperature too warm.
1. Replace headmaster.
h) Water Supply Line
(water-cooled model)
1. Condenser water
pressure too low or
off and high pressure
control opens and
closes frequently.
1. Check and get
recommended pressure.
i) Water Regulating Valve
(water-cooled model)
1. Set too high. 1. Adjust or replace. See
"V.J. Adjustment of Water
Regulating Valve."
2. Evaporator is Frozen Up
Problem Possible Cause Remedy
[1]Freeze cycle time is
too long.
a) Inlet Water Valve 1. Diaphragm does not
close.
1. Check for water leaks with
icemaker off.
b) Float Switch 1. Float does not move
freely or defective
switch.
1. Clean or replace. See "IV.
D. Float Switch Check and
Cleaning."
c) Evaporator 1. Scaled up. 1. Clean.
2. Damaged. 2. Replace.
d) Spray Tubes 1. Dirty. 1. Clean.
2. Out of position. 2. Place in position.
e) Pump Motor 1. RPM too slow. 1. See chart 1.[5].