TU600B
Trackunit TU600B, Technical Manual v1.0, March 2022 Page 20
Troubleshooting
Various error situations are listed below along with some possible solutions.
Error
Error description Possible solutions
F1 The unit does not
answer the SMS
command send to it.
Verify if the SMS messages are sent to the correct GSM/LTE
M1/NB IOT phone number.
Check LED status; See the “Functionality check” chapter in this
manual.
If the TU600B unit has been delivered with the SIM card
mounted. Contact Trackunit support.
o Or contact the mobile operator to verify if there is
any problem with the SIM card.
Verify if the SIM card is correctly mounted in the unit.
F2 The LED in the unit is
off, thus no power on the
unit.
Check if the installation is performed correctly according to the
guidelines of this manual.
F3 The LED is constant red;
thus the unit is not
attached to the GSM /
LTE network
If the TU600B unit has been delivered with the SIM card
mounted. Contact Trackunit support.
o Or contact the mobile operator to verify if there is
any problem with the SIM card.
Verify if the SIM card is correctly mounted in the unit.
Verify if the PIN code has been disabled from the SIM card
before it was inserted in the unit
F4 The unit send reply
messages but there is no
GPS signal
Verify if the unit is mounted according to the instructions laid out
in this manual with respect to the aerial view; see “Installing the
unit” chapter.
If the machine/vehicles are located inside a building, please
move the machine/vehicle outside a try again.
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