1001. If an attempted light off of an idle boiler fails, what should be done?

The fuel should be secured to the boiler and the boiler allowed to remain idle for a few minutes before another light-off attempt is made.
Another light-off attempt (just one) can be undertaken before any additional precautions need to be observed.
Another light-off attempt (with no limit) can be undertaken before any additional precautions need to be observed.
The fuel should be secured to the boiler and the furnace purged of combustible vapors with the forced draft fan before another light off attempt is made.

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