List of Error Codes for the DUO+
E1 - Network Unit not receiving signal from cell tower.
E2 - Coverage Unit hardware failure.
E3 - Coverage Unit is overheating.
E4 - Network Unit is overheating.
E6 - Network Unit hardware failure.
E8 – Input signal too strong.
Too Close - Unit too close to operate.
Too Far- Units too far apart to operate.