What should I do if a burner does not light within a few seconds of turning it on?

If the burner does not light within 4 seconds, turn the burner off immediately. Check to see that the cap is positioned correctly on the burner base and that the igniter is clean and dry. If the burner still fails to ignite after checking these items, refer to the 'Before Calling for Service' section. (Page 10)

From the official Bosch NGT/NGP Gas Cooktop manual, page 10

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