Hoshizaki KM-900MAH Service Manual page 49

PROBLEM
l) Controller Board
m) Interlock Switch
(Cleaning Valve)
[2] Water a) Float switch
continues to
be supplied,
and the ice-
maker will not b) Controller Board
start.
[3] Compressor a) Wash Switch
will not start
or operates b) High Pressure
intermittently. Control
c) Water Regulator
d) Overload Protector
e) Starter
f) Start Capacitor or
Run Capacitor
g) Magnetic Contactor
h) Compressor
i) Controller board
j) Discharge Temp.
Switch
POSSIBLE CAUSE
1. Defective
1. "OFF" position.
2. Bad contacts.
1. Connector disconnected.
2. Leads opened or defective
switch.
3. Float does not move freely.
1. Defective.
1. "WASH" position.
2. Bad contacts.
1. Dirty Air Filter or
Condenser.
2. Ambient or condenser
water temp. too warm.
3. Refrigerant overcharged.
4. Condenser water pressure
too low or off. [Water-
cooled model only].
5. Fan not operating. [Except
water-cooled model].
6. Refrigerant line or
components plugged.
1. Set too high.
1. Bad contacts.
2. Voltage too low.
3. Refrigerant overcharged or
undercharged.
4. Line Valve continues to
close in freeze cycle and
Overload Protector
operates.
1. Bad contacts.
2. Coil winding opened.
1. Defective.
1. Bad contacts.
2. Coil winding opened.
1. Wiring to Compressor.
2. Defective.
3. Protector tripped.
1. Defective.
1. Refrigerant
undercharged.
2. Cooling Fan not operating.
49
REMEDY
1. See "II.2[e] CHECKING
CONTROLLER BOARD."
1. Move to "ON" position.
2. Check for continuity and
replace.
1. Place in position.
2. Check and replace.
3. Clean or replace.
1. Replace.
1. Move to "ICE" position.
2. Check and replace.
1. Clean.
2. Reduce ambient temp.
3. Recharge.
4. Check and get
recommended pressure.
5. See chart 1 - [6].
6. Clean and replace Drier.
1. Adjust lower.
1. Check for continuity and
replace.
2. Increase voltage.
3. Recharge.
4. Check Line Valve's
operation in freeze cycle
and replace.
1. Check and replace.
2. Replace.
1. Replace.
1. Check for continuity and
replace.
2. Replace.
1. Check for loose
connection or open, and
replace.
2. Replace.
3. Reduce temperature.
1. See "II.2. [e] CHECKING
CONTROLLER BOARD."
1. Recharge.
2. See chart 1 - [6]