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Control unit LEDs
LED
Color
BATT OK
Green
PWR OK
Green
FAULT
Red
WRITE
Yellow
Indication
Battery voltage of the real-time clock is OK (higher than 2.8 V).
When the LED is not lit,
• battery voltage is below 2.8 V,
• the battery is missing, or
• the control unit is not powered.
Internal voltage OK
The control program indicates that the equipment is faulty. See
the appropriate firmware manual.
Writing to SD card in progress.
Maintenance 77
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