Hoshizaki FM-300AKE-HC Service Manual page 41

Code Error
Low Voltage
Sensing
En
Transformer
Circuit Open
Controller Board
EU
Error
Electric Leak
None
Short Circuit
Non-Interlock Errors
Code Error
CM Microcomputer
Time Read/Write
"- -" Error
Icemaking
c0
Water Leak
c1 Low Water
Abnormal High
c2
Side Pressure
Abnormal Low
c3
Voltage
c4 Drain Error
Gear Motor
c5
Error
Evaporator
Outlet
c7
Temperature
Decrease
Condition
Low voltage sensing
transformer circuit is
open.
Controller board IC fails.
Electric leak or
overcurrent.
Condition
Microcomputer fails to
read/write properly.
After initial water supply,
float switch trips at lower
float level within 5 minutes
after gear motor starts and
before compressor starts.
Water supply continues for
more than 90 seconds, or
float switch trips at lower
float level and does not
reset for more than 60
seconds after water
supply.
Pressure switch stays
OFF for 5 seconds or
condenser thermistor
reads higher than set point
for 5 seconds.
Voltage stays below
setting for more than 1
second with compressor
ON and control water
valve OFF.
Float switch trips at upper
float level in 10 minutes
after flush water valve
turns ON.
Rotation rate reduces.
While gear motor is
running, voltage detection
signal is not input to
controller board.
Evaporator outlet
temperature decreases.
Operation Reset
Power supply,
Whole unit
Turn OFF -
stops.
Turn ON
Power supply,
Whole unit
Turn OFF -
stops.
Turn ON
Power supply,
Whole unit Turn OFF -
stops.
Turn ON
Replace fuse
Operation
Memory circuit Replace
not available. controller board.
Whole unit stops.
Flush water
valve turns ON
Error record only.
for 1 second,
then turns OFF.
Unit restarts.
Whole unit stops
until reservoir fills
up. Only control Automatically
water valve resets after
operates reservoir fills up.
intermittently for
5 minutes.
Automatically
resets after
pressure switch
turns ON or
Whole unit stops.
condenser
thermistor reads
lower than set
point.
Automatically
resets after
voltage stays
Whole unit stops.
above reset
setting for 2
minutes.
N/A Error record only.
Automatically
Whole unit stops. resets after 30
minutes.
Automatically
Indication only.
resets.
38
Check/Repair
Low voltage sensing
Transformer
Replace controller board.
Electric leak, fuse
Reset Check/Repair
Error records and
compressor
operating hours not
available on display
Water leak from
water circuit
(reservoir, hoses,
mechanical seal,
flush water valve),
float switch
Water supply
interruption, control
water valve not
opening, flush
water valve not
closing, float
switch, water leak
Condenser
clogged, cooling
water circuit,
refrigeration circuit
Supply voltage
Flush water valve
not opening, control
water valve not
closing
Gear motor
overloaded
Evaporator inside
not clean, extruding
head not clean,
heater circuit open