Worcester Bosch Ignition Sequence Incomplete

Boiler fan runs but burner does not light, no error code displayed initially.

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

Faulty ignition electrode, Loose ignition lead, Gas valve not opening, Faulty PCB ignition control

Safety first: Gas and ignition components must be serviced by a Gas Safe engineer.

Engineer actions:

Check the ignition electrode and lead for damage and secure connections; replace if necessary.
Verify that the gas valve receives an opening signal from the PCB during ignition.
Measure gas pressures and ensure supply is adequate.
If gas valve and ignition components are sound, test and replace the main PCB if it fails to complete the ignition sequence.

Professional Required 5/5

Ignition Electrode

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