Boiler displays E13, burner stops, may be associated with flue issues

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

Blocked or undersized flue, Faulty flue gas temperature sensor, Incorrect gas rate or combustion settings, Scaled primary heat exchanger

Safety first: Turn off the boiler and do not operate it with a suspected flue problem.

Check flue terminal: Ensure the ACV flue outlet is not obstructed by debris, ice, or covers.
Ventilation: Confirm that any required ventilation openings around the boiler are not blocked.
Reset once: After cooling, reset the boiler. If E13 returns, stop using the boiler.
Professional checks: A technician must inspect the flue system, test the flue gas temperature sensor, clean the heat exchanger, and verify combustion with a flue gas analyzer.

Hard 4/5

Flue Gas Temperature Sensor

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