Worcester Bosch Early Flame Failure / Safety Shutdown

Boiler starts then shuts down after a few seconds without showing a specific error code.

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

Weak flame signal, Incorrect gas/air ratio, Blocked burner, Faulty ionisation electrode

Safety first: Repeated failed starts can be a sign of combustion problems. Do not ignore.

Observe sequence: Listen for fan start, ignition clicks, and brief flame. Note any patterns for the engineer.
Check flue terminal: Ensure it is clear and correctly installed.
Engineer tasks: A Gas Safe engineer should inspect and clean the burner, check electrodes, verify gas pressures, and adjust combustion using a flue gas analyser.

Professional Required 5/5

Burner Assembly

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