Hoshizaki KM-900MAH, Service Manual

Page: 48 / 73

48
PROBLEM POSSIBLE CAUSE REMEDY
[1] The icemaker a) Power Supply 1. “OFF” position. 1. Move to “ON” position
will not start 2. Loose connections. 2. Tighten
3. Bad contacts. 3. Check for continuity and
replace.
4. Voltage too high. 4. Check and get
recommended voltage.
b) Fuse (Inside Fused 1. Blown out. 1. Check for short circuit
Disconnect, if any) and replace
c) Control Switch 1. “OFF” position. 1. Move to “ICE” position.
2. Bad contacts. 2. Check for continuity and
replace.
d) Bin Control 1. Tripped with bin filled 1. Remove ice.
Thermostat with ice.
2. Ambient temperature
2. Increase ambient
too cool. temperature.
3. Set too warm. 3. See “II.2.[d]
CONTROLS AND
ADJUSTMENTS, 5) Bin
Control.”
4. Bulb out of position. 4. Place in position.
5. Bad contacts or leaks 5. Check for continuity and
bulb. replace.
e) High Pressure 1. Bad contacts. 1. Check for continuity and
Control replace.
f) Transformer 1. Thermal fuse blown out 1. Replace.
or coil winding opened.
g) Wiring to 1. Loose connections or 1. Check for continuity and
Controller Board open. replace.
h) Thermistor 1. Leads short-circuit or 1. See “II.2.[d] CONTROLS
open and High AND ADJUSTMENTS, 1)
Temperature Safety Defrost Control.”
operates.
i) Hot Gas Solenoid 1. Continues to open in 1. Check for power off in
Valve freeze cycle and High freeze cycle and replace.
Temperature Safety
operates.
j) Water Supply Line 1. Water supply off and 1. Check and get
water supply cycle does recommended pressure.
not finish.
2. Condenser water pressure
2. Check and get
too low or off and Pressure recommended pressure.
Control opens and closes
frequently to finally operate
High Temperature Safety.
k) Water Solenoid 1. Mesh filter or orifice gets 1. Clean.
clogged and water supply
cycle does not finish.
2. Coil winding opened.
2. Replace.
3. Wiring to Water Valve. 3. Check for loose connection
or open, and replace.
IV. SERVICE DIAGNOSIS
1. NO ICE PRODUCTION
For mechanical
bin control
see “II. 3. [c]”