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29
Trouble Shooting Guide
PROBLEM CAUSE POSSIBLE SOLUTION
LED not flashing
No power
Check power supply
LED fast flashes
(every 1 second)
and never slow
flashes (every 3
seconds)
Cannot find the GSM network
1.
Replace aerial with high gain
aerial
2.
Move unit to different location
3.
SIM card not installed
4.
SIM has a pin number (remove)
5.
SIM is locked (remove lock)
LED slow flashes
(every 3 seconds)
But no texts are sent
or received
The unit can find the GSM network
(hence the slow flashes) but the signal
strength is to low
1.
Replace aerial with high gain
aerial
2.
Move unit to different location
3.
SIM card NOT registered with
the network provider
4.
No credit on the SIM card
Ezy Switch SMS-IRR-4 Installation & Operation