cause of the overcurrent must be removed to avoid a repeat of the error. The Gear Motor
amperage will increase if it locks or hunts due to an ice blockage or insufficient torque
caused by low voltage.
2. The error code “E7” blinks after “E8” is displayed ten times. If “E8” appears repeatedly, the
Evaporator assembly must be under excessive load each time (see Note 1 for details).
Repetitive overload on the Evaporator assembly accumulates metal fatigue inside, which
may suddenly break the Auger or twist the Evaporator without any visible symptom. When
“E7” blinks, replace the entire Evaporator assembly including the Evaporator, Auger,
Coupling and Housing. After replacement, reset the Display as follows:
1) Move the Operation Switch to the “STOP” position.
2) Turn ON the Dip Switch 4 on the Sub Board.
3) Move the Operation Switch to the “RUN” position.
4) Turn OFF the Dip Switch 4 on the Sub Board.
5) Turn ON the Dip Switch 4 on the Sub Board.
6) Move the Operation Switch to the “STOP” position.
7) Turn OFF the Dip Switch 4 on the Sub Board.
8) While pushing the Option Button and Stop Button on the Operation Panel, move the
Operation Switch to the “RUN” position.
Non-Interlock Errors
(Applicable Codes for FM-481 = All)
Code
Error
Condition
Operation
Reset
Check/Repair
CM
Time
“— —”
Microcomputer
Read/Write
Error
Microcomputer fails to
read/write properly.
Memory circuit
not available.
Replace
Controller
Board.
Error records and
compressor
operating hours not
available on display
c1
Low Water
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.
Whole unit stops
until Reservoir
fills up. Only
Control Water
Valve operates
intermittently
every 5 minutes.
Automatically
resets after
Reservoir fills
up.
Water supply
interruption, Control
Water Valve not
opening, Flush Water
Valve not closing,
Float Switch, Water
leaks
c2
Abnormal High
Side Pressure
Pressure Switch stays
OFF for 5 seconds.
Whole unit stops.
Automatically
resets after
Pressure
Switch turns
ON.
Fan Motor, Cooling
water circuit,
Refrigeration circuit,
Condenser clogged
c3
Abnormal Low
Voltage
(Only when Dip Switch 5
is ON)
Voltage stays below 64
– 84% rating for more
than 1 second with
Compressor ON and
Control Water Valve
OFF.
Whole unit stops.
Automatically
resets after
voltage stays
above 69 –
94% rating for
120 seconds.
Supply voltage
c4
Drain Error
Float Switch trips at
upper float level in 10
minutes after Flush
Water Valve turns ON.
Indication only.
N/A
Flush Water Valve
not opening, Control
Water Valve not
closing
20
E2AH5820209