Junkers Flue Gas / Draft Fault

E3 error; unit may shut down during operation, especially in windy conditions.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Wind affecting flue terminal, Partially blocked flue, Incorrect flue length or configuration, Faulty flue gas sensor

Safety: Flue issues can lead to carbon monoxide hazards. Do not ignore repeated E3 errors.

Inspect outside terminal: Ensure the terminal is not in a high wind zone without proper shielding. Remove any obstructions.
Check for icing: In cold climates, remove ice buildup around the terminal.
Visual flue check: From accessible points, look for disconnected or crushed flue sections.
Call professional: If E3 persists, a certified technician must check flue design and combustion.

Professional Required 5/5

Flue Gas Sensor / Flue System

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