Hoshizaki KMD-901MWH Service Manual page 37

Problem
[5] Water pump will not
start. (continued)
[6] Freeze cycle time is
too short.
[7] Fan motor will
not start, or is not
operating. (except
water-cooled model)
[8] All components
run, but no ice is
produced.
Possible Cause
a) Pump Motor
(continued)
b) Control Board
c) Control Switch
a) Drain Valve
b) Float Switch
c) Control Board
a) Fan Motor
b) Control Board
a) Refrigerant
b) Compressor
c) Hot Gas Valve
d) Line Valve
(if applicable)
e) Inlet Water Valve
f) Expansion Valve
g) Headmaster (C.P.R.)
(remote air-cooled
model only)
h) Water Supply Line
(water-cooled model
only)
i) Water Regulating Valve
(water-cooled model
only)
6. Mechanical seal worn
out.
1. Defective.
1. Bad contacts.
1. Leaking by.
1. Dirty or erratic
operation.
1. Defective.
1. Motor winding
opened.
2. Bearing worn out.
3. Wiring to fan motor.
4. Defective capacitor.
5. Fan blade bound.
1. Defective.
1. Low charge.
2. Air or moisture
trapped.
1. Defective valve.
1. Continues to open in
freeze cycle.
1. Continues to close in
freeze cycle.
1. Water valve is wide
open during freeze.
1. Operating erratically.
1. Not operating properly
and liquid line
temperature too warm.
1. Condenser water
pressure too low or
off and high pressure
control opens and
closes frequently.
1. Set too high.
37
Remedy
6. Check and replace.
1. See "II.C.4. Control Board
Check Procedure."
1. Replace.
1. Clean or replace.
1. Clean or replace.
1. See "II.C.4. Control Board
Check Procedure."
1. Replace.
2. Replace.
3. Check for loose
connection or open, and
replace.
4. Replace.
5. Check and replace.
1. See "II.C.4. Control Board
Check Procedure."
1. Check for leaks and
recharge.
2. Replace drier and
recharge.
1. Replace.
1. Check and replace.
1. Check and replace.
1. Check for water leaks with
icemaker off.
1. Check and replace.
1. Replace headmaster.
1. Check and get
recommended pressure.
1. Adjust or replace. See
"V.G. Adjustment of Water
Regulating Valve."