Navien error codes and what they mean · Ukraine

All 2 Navien fault codes in one table: what each one means, how serious it is and when to call a pro.

Code	Appliance	What it means
E003	water heater	The water heater failed to ignite because no flame was detected, and it has locked out as a safety measure.
E016	water heater	The water heater overheated and the safety thermostat cut it out.