Hoshizaki KML-451MAH Service Manual page 27

Problem
[1] The icemaker will not
start. (continued)
Possible Cause
e) High Pressure Control
(continued)
f) Transformer
g) Wiring to Control Board 1. Loose connections or
h) Thermistor
i) Hot Gas Valve
j) Water Supply Line
k) Inlet Water Valve
l) Control Board
3. Ambient or condenser
water temperature too
warm.
4. Refrigerant
overcharged.
5. Fan not operating.
(except water-cooled
model)
6. Refrigerant line or
components plugged.
7. Condenser water
pressure too low or off.
(water-cooled model)
1. Coil winding opened
or shorted.
open.
1. Leads shorted or
opened and high
temperature or harvest
backup timer safety
operates. (1 beep or 2
beep alarm)
1. Continues to open
in freeze cycle and
freeze timer safety
operates. (3 beep
alarm)
1. Water supply off and
water supply cycle
does not finish.
2. Condenser water
pressure too low
or off and pressure
control opens and
closes frequently to
finally operate high
temperature safety.
(1 beep alarm)
1. Mesh filter or orifice
gets clogged and
water supply cycle
does not finish.
2. Coil winding opened.
3. Wiring to water valve. 3. Check for loose
1. Defective or in alarm. 1. See "II.C.4. Control Board
27
Remedy
3. Reduce temperature.
4. Recharge.
5. See chart 1.[6]
6. Clean and replace drier.
7. Check and get
recommended pressure.
1. Replace.
1. Check for continuity and
replace.
1. See "II.D. Harvest Control
– Thermistor."
1. Check for hot gas valve
stuck open and replace.
1. Check and get
recommended pressure.
2. Check and get
recommended pressure.
1. Clean.
2. Replace.
connection or open, and
replace.
Check Procedure."