Evaporator Is Frozen Up - Hoshizaki KM1601SRH350 Service Manual

Problem
[7] Fan motor will
not start, or is not
operating (except
water-cooled model).
[8] All components
run, but no ice is
produced.

2. Evaporator is Frozen Up

Problem
[1]Freeze cycle time is
too long.
Possible Cause
a) Fan Motor
b) Control Board
a) Refrigerant
b) Compressor
c) Hot Gas Valve
d) Liquid Line Valve
(if applicable)
e) Inlet Water Valve
f) Expansion Valve
g) Headmaster (C.P.R.)
(remote condenser
unit)
h) Water Supply Line
(water-cooled models)
i) Water Regulating Valve
(water-cooled models)
Possible Cause
a) Inlet Water Valve
b) Float Switch
1. Motor winding open.
. Bearing worn out.
3. Wiring to fan motor.
4. Defective capacitor.
5. Fan blade bound.
1. Defective.
1. Low charge.
. Air or moisture
trapped.
1. Defective.
1. Continues to open in
freeze cycle.
1. Continues to close in
freeze cycle.
1. Inlet water valve is
wide open during
freeze.
1. Bulb loose.
. Operating erratically.
1. Not operating properly
and liquid line
temperature too warm.
1. Condenser water
pressure too low or
off and high pressure
control opens and
closes frequently.
1. Set too high.
1. Diaphragm does not
close.
1. Float does not move
freely.
. Defective switch.
32
Remedy
1. Replace.
. Replace.
3. Check for loose
connection or open,
and replace.
4. Replace.
5. Check and replace.
1. See "II.C.4. Control
Board Check
Procedure."
1. Check for leaks.
Recover, repair,
evacuate, and
recharge.
. Replace drier,
evacuate, and
recharge.
1. Replace.
1. Check and replace.
1. Check and replace.
1. Check for water leaks
with icemaker off.
1. Secure bulb.
. Check and replace.
1. Replace headmaster.
1. Check and get
recommended
pressure.
1. Adjust or replace.
See "V.J. Adjustment
of Water Regulating
Valve."
Remedy
1. Check for water leaks with
icemaker off.
1. Clean or replace. See "II.
E. Float Switch."
. Check and replace. See
"II.E. Float Switch."