Boiler locks out with F28 during ignition attempts, clicking heard but no flame

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

No gas supply, air in gas line, faulty ignition electrode, incorrect gas valve operation, blocked burner

Safety: If you smell gas, do not attempt to reset the boiler. Ventilate and call emergency services.

Check gas supply: Ensure the gas meter is on and credit is available (if prepay). Confirm other gas appliances work.
Reset once: Press the reset button once and observe. Do not repeatedly reset.
Bleeding (technician): After gas work or long shutdown, a professional may need to purge air from the gas line.
Inspect ignition components: A technician should check the ignition electrode gap, cable, and burner cleanliness, and test gas valve operation.

Professional Required 5/5

Ignition Electrode

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