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ESIM022 User manual v1.1
17. TECHNICAL SUPPORT
17.1. Troubleshooting
Indication
Possible reason
LED indicator is OFF
· Power supply fault (if back-up not in use)
· No mains power (if back-up not in use)
· Micro-controller fault
The device does not continue running
when mains power supply is lost
· Back-up battery not connected
· Back-up battery is faulty and has to be replaced
· Back-up battery not charged yet
· Battery charger unit fault
Unable to receive any SMS text mes-
sage reply to the user phone number
and control the device
· Insufficient SIM card credit balance
· No GSM network signal
· Wrong user phone number
· User phone number is not set
Received SMS text message
“Wrong syntax”
· Incorrect SMS text message structure
· Unnecessary space character might have been
typed in SMS text message
17.2. Restoring Default Parameters
1. Disconnect the power supply, USB cable and rback-up battery (if any).
2. Press and hold the RESET button.
3. Plug in the USB cable or connect the power supply.
4. Wait until the LED indicator flashes 4 times.
5. Release the RESET button.
6. Parameters restored to default.
