E30 II

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Error Code	Cause Analysis	Troubleshooting / Solution
Auto and -3	Upgraded the incorrect firmware	Upgrade the correct version of firmware directly.
DFU	DFU mode may be accidently entered	Unplug the power supply and reboot.
d-3	Unit may be defective	Check the power supply and try with other DC5V power supplies, disconnect all the inputs and outputs of E30II and reboot. If that still not works, unit is considered defective.
Cycle displaying DIR and Err	Unit may be defective	Check the power supply and try with other DC5V power supplies, disconnect all the inputs and outputs of E30II and reboot. If that still not works, unit is considered defective.
Cycle displaying INH and Err	Too high input voltage (input voltage is greater than 6V)	Check the power supply and try with other DC5V power supplies.
Cycle displaying INL and Err	Too low input voltage (input voltage is lower than 4.2V)	Check the power supply and try with other DC5V power supplies.
Cycle displaying PN and Err	Unit may be defective	Check the power supply and try with other DC5V power supplies, disconnect all the inputs and outputs of E30II and reboot. If that still not works, unit is considered defective.