Evaporator Is Frozen Up - Hoshizaki KM-61BAH Service Manual

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3. EVAPORATOR IS FROZEN UP

PROBLEM
[1] Freeze cycle
time is too
long.
[2] All ice formed
on Evaporator
does not fall
into bin in
harvest cycle.
[3] Others
2940 Hwy 14 W, Rochester, MN 55901
POSSIBLE CAUSE
a) Float Switch 1. Leads shorted or
defective switch.
2. Float does not move
freely.
b) Inlet Water Valve 1. Diaphragm does not
close.
c) Control Board 1. Defective.
a) Evaporator 1. Scaled up.
b) Water Supply Line 1. Water pressure too low.
c) Inlet Water Valve 1. Dirty mesh filter or
orifice.
2. Diaphragm does not
close.
d) Ambient and/or 1. Too cool.
water temperature
e) Thermistor 1. Out of position or loose
attachment.
f) Control Board 1. Harvest Timer is set too
short.
2. Defective.
a) Spray Tubes 1. Clogged.
2. Out of position.
b) Water System 1. Dirty.
c) Refrigerant 1. Undercharged.
d) Expansion Valve 1. Bulb out of position or
(KM-151 only) loose attachment.
2. Defective.
e) Hot Gas Solenoid 1. Coil winding opened.
Valve
2. Plunger does not move.
3. Wiring to Hot Gas
Valve.
f) Water Supply Line 1. Too small; requires 3/8"
OD line dedicated per
machine.
g) Water Filter 1. Flow rate too small.
1. Check and replace.
2. Clean or replace.
1. Check for water leaks
1. See "II. 3. [d] CONTROL
1. Clean.
1. Check and get
1. Clean.
2. Check for water leaks
1. Increase temperature.
1. See "VI. 16.
1. Adjust longer, referring to
2. See "II. 3. [d] CONTROL
1. Clean.
2. Place in position.
1. Clean.
1. Check for leaks and
1. Place in position.
2. Replace.
1. Replace.
2. Replace.
3. Check for loose
1. Increase water supply line
1. Replace with filter that
38
REMEDY
with icemaker off.
Replace if necessary.
BOARD CHECK
PROCEDURE".
recommended pressure.
with icemaker off.
Replace if necessary.
THERMISTOR".
"II. 4. HARVEST
CONTROL -
THERMISTOR".
BOARD CHECK
PROCEDURE".
recharge.
connection or open, and
replace.
size.
has larger flow rate.