Evaporator Is Frozen Up - Hoshizaki KM-1601MRH/3 Service Manual

Problem
[6] Fan motor will
not start, or is not
operating.
[7] All components
run, but no ice is
produced.

2. 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.
Possible Cause
a)Fan Motor
b)Control Board
a)Refrigerant
b)Compressor
c) Hot Gas Valve
d)Line Valve
e)Inlet Water Valve
f) Headmaster (C.P.R.)
(Remote Unit)
Possible Cause
a) Float Switch
b) Inlet Water Valve
c) Control Board
a) Evaporator
b) Water Supply Line
c) Water Filter System
d) Inlet Water Valve
e) Ambient and/or water
temperature.
f) Line Valve
1. Motor winding opened. 1. Replace.
2. Bearing worn out.
3. Wiring to fan motor.
4. Defective capacitor.
5. Fan blade bound.
1. Defective.
1. Undercharged.
2. Air or moisture
trapped.
1. Defective valve.
1. Continues to open in
freeze cycle.
1. Continues to close in
freeze cycle.
1. Water valve is wide
open during freeze.
1. Not operating properly
and liquid line
temperature too warm.
1. Leads short-circuit or
defective switch.
2. Float does not move
freely.
1. Diaphragm does not
close.
1. Defective.
1. Scaled up.
1. Water pressure too
low.
1. Dirty/Restricted
1. Dirty mesh filter or
orifice.
2. Diaphragm does not
close.
1. Too cool.
1. Continues to open in
harvest cycle.
39
Remedy
2. Replace.
3. Check for loose
connection or open, and
replace.
4. Replace.
5. Check and replace.
1. See "IV.B. Control Board
Check."
1. Check for leaks and
recharge.
2. Replace drier and
recharge.
1. Replace.
1. Check and replace.
1. Check and replace.
1. Check for water leaks with
icemaker off.
1. Replace headmaster.
Remedy
1. Check and replace.
2. Clean or replace.
1. Check for water leaks with
icemaker off.
1. See "IV.B. Control Board
Check."
1. Clean.
1. Check and get
recommended pressure.
1. Replace filter.
1. Clean.
2. Check for water leaks with
icemaker off.
1. Increase temperature.
1. Check operation in harvest
cycle and replace.