Attack Flame Detection / Early 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 at Attack ionization electrode, Poor earth connection to boiler chassis, Partially blocked burner, Low gas pressure at burner

Safety: Turn off power and gas before opening the boiler.

Steps:

Clean ionization electrode: Remove and gently clean the flame sensor with fine abrasive pad. Ensure correct positioning.
Check earth connection: Verify that the boiler is properly earthed and that the earth wire is securely connected to the chassis.
Inspect burner: Clean any visible debris from the burner surface.

Technician: If the problem persists, a gas engineer should check gas pressure and combustion quality.

Hard 4/5

Flame Ionization Electrode

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