Hoshizaki KM-1900SAH Service Manual page 47

Problem
[3] Compressor will
not start or stops
operating.
[4] Water continues to
be supplied in freeze
cycle.
[5] Water pump will not
start.
[6] Freeze cycle time is
too short.
Possible Cause
a) Magnetic Contactor
b) Start Capacitor or Run
Capacitor
c) Internal Overload
Protector Open (check
1 through 3 to the right
and d through f below)
d) Starter
e) Compressor
f) Control Board
a) Water Pressure
b) Inlet Water Valve
c) Control Board
a) Pump Motor
b) Control Board
c) Control Switch
a) Pump Out Check Valve 1. Leaking by.
b) Float Switch
c) Control Board
d) Water System
1. Bad contacts.
2. Coil winding open.
1. Defective.
1. Loose terminal.
2. Voltage.
3. Dirty condenser.
1. Bad contacts.
2. Coil winding open.
1. Power supply not
within specifications.
2. Wiring to compressor. 2. Check for loose
3. Defective.
4. Protector tripped.
1. No power to contactor. 1. See "II.C.4. Control
1. Too high.
1. Diaphragm does not
close.
1. Defective.
1. Motor winding open.
2. Bearing worn out.
3. Wiring to pump motor. 3. Check for loose
4. Defective capacitor.
5. Defective or bound
impeller.
6. Mechanical seal worn
out.
1. Defective.
1. Bad contacts.
1. Dirty or erratic
operation.
1. Defective.
1. Water leaks.
47
Remedy
1. Check for continuity
and replace.
2. Replace.
1. Replace.
1. Tighten or replace.
2. Check and correct.
3. Clean.
1. Check and replace.
2. Replace.
1. Refer to nameplate and
correct.
connection or open,
and replace.
3. Replace.
4. Reduce temperature.
Board Check
Procedure."
1. Reduce.
1. Check for water leaks
with icemaker off.
1. See "II.C.4. Control
Board Check
Procedure."
1. Replace.
2. Replace.
connection or open,
and replace.
4. Replace.
5. Replace and clean.
6. Check and replace.
1. See "II.C.4. Control
Board Check
Procedure."
1. Replace.
1. Clean or replace.
1. Clean or replace. See
"II.E. Float Switch."
1. See "II.C.4. Control
Board Check
Procedure."
1. Check connections
for water leaks, and
replace.