BURNER FAILS TO START High

Worcester Bosch BURNER FAILS TO START Fault Code

Also written as BURNERFAILSTOSTART — same fault.

The Worcester Bosch BURNER FAILS TO START fault code means: your boiler is failing to ignite because it is not receiving the necessary signals or power to start the heating process.. It appears on 7 Worcester Bosch models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: No power to boiler; Faulty boiler thermostat; Programmer open circuit; Faulty control box
Typical repair cost £150-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Worcester Bosch models that show the BURNER FAILS TO START fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch BURNER FAILS TO START fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026