Navien Reason Error Code
Self-diagnostic/ Action E003 Ignitionfailure Ensure that the main gas supply val
Source: npn-199e__navi-npn-199e-english-iom.pdf
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Other Navien Error Codes
Ignitionfailure Ensure that the main gas supply valve is open. E004 Falseflamede
Flameloss Cleantheintakeairfilter.SeetheOperationmanual. ·Ensure that the electr
Overheatingof heatexchanger ·Turn off the system for at least 30 minutes, and th
Exhaustoverheatingthewater Turn off the systemfor at least 30minutes,and then he
Abnormal operation:limit control ContactTechnicalSupportat1-800-519-8794. E047 A
Abnormaloperation:dualventuri Contact Technical Support at 1-800-519-8794. E109
Abnormal air pressure ·Ensurethattheexhaustpipeisfreeofobstructions. ·Clean the
Hotwateroutlet:thermostat Contact Technical Support at 1-800-519-8794. openorsho
Cold waterinlet1:thermostat Contact Technical Support at 1-800-519-8794. openors
Cold water inlet2:thermostat Contact Technical Support at 1-800-519-8794. openor
Abnormal operation:water ContactTechnicalSupportat1-800-519-8794. adjustment val
Abnormal operation: circulation External: Ensure that all watersupply and return