Navien Error Code E014
Exhaust Overheat Detection
Error code E014 indicates that the exhaust temperature sensor has detected temperatures exceeding safe operating limits. This is a safety lockout to prevent damage and potential hazards.
Common causes include blocked or restricted venting, improper vent sizing, insufficient combustion air, or issues with the heat exchanger. Professional diagnosis and correction are essential.
• Blocked, kinked, or improperly sized exhaust venting
• Restricted air intake preventing proper combustion airflow
• Excessive vent pipe length or too many elbows
• Dirty or scaled heat exchanger reducing efficiency
• Improper gas pressure or air/fuel mixture
Call a licensed HVAC technician immediately. E014 requires professional inspection of the venting system, combustion analysis, and potential heat exchanger service. Do not operate the boiler until repaired.
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