Navien Fault Codes

Select a fault code to see its meaning, common causes and how to fix it.

• E003 The E003 code appears on Navien boilers and water heaters when the unit has attempted to light the burner but failed to… Read more →
• E012 The E012 code appears on Navien boilers when the unit fires up successfully but then loses its flame mid-operation and… Read more →
• E016 The E016 code on a Navien boiler signals that the secondary (plate) heat exchanger has reached an unsafe temperature… Read more →
• E030 The E030 code is a safety lockout triggered when the exhaust gas temperature climbs above approximately 65°C, causing… Read more →
• E110 The E110 code means the Navien unit's control board has detected that air pressure within the combustion system is… Read more →