MM-400A
13. Error List and Maintenance
13-1
13. Error List and Maintenance
(1) Troubleshooting
The MM-400A informs of an error occurrence by showing the error number.
Error
code
Description Cause Remedy
E01 SYSTEM
ERROR
Problem
detected in
MM-400A’s
control system
Turn off the power and on again.
If the error is not eliminated, the MM-400A needs
repair. Please contact us.
E02 FREQUENCY
ERROR
A problem was
detected in the
frequency
detection circuit.
Turn off the power and on again.
Check if the input power supply in use has
disturbance in frequency.
E03 TRIGGER
LEVEL
ERROR
A problem was
detected in the
current detection
circuit.
Turn off the power and on again.
If the error is not eliminated, the MM-400A needs
repair. Please contact us.
E04 BATTERY
VOLTAGE
LOW
The backup
battery voltage is
2.2 V or less.
Replace the batteries.
Refer to “(2) Replacing the Battery.”
E05 SCHEDULE
ERROR
Schedule data in
memory is
damaged.
Check all the settings.
If the data in memory is damaged, the following
are possible causes:
• Generation of powerful power supply or
electrostatic noise
• Abnormal supply voltage resulting, for example,
from lightening or induced lightening
• Flash memory’s rewrite limit exceeded
It would be useful to record the settings in
preparation for data damage. To print the settings,
use the print function (refer to “n. PRINT Screen”
in Chapter 8, “Operation Screens”) or Chapter 17
“Schedule Data Table.” Also, you can save data in
a USB (refer to “i. USB Screen” in Chapter 8,
“Operation Screens”).
When you touch the INITIAL key and select YES
(refer to “n-1. SYSTEM SETUP (1) Screen” in
Chapter 8, “Operation Screens”), the memory is
initialized, resetting all settings back to factory
settings. Set the data you recorded again. The
memory will be initialized in approximately 10
seconds. Do not turn OFF the power during the
initialization.
If the error is not eliminated, the MM-400A needs
repair. Please contact us.
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