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A 3L is: Blower switched off during a safety test. The only thing you can do is check the electrical connectionto the blower. If that doesn't work then this is a job for a pro
Could be a bad connection. There are several other possibilities none of which can be tracked down by a typical homeowner.
All you can do is locate the connections on the blower (exhaust fan) cable, take the connector apart and put it back together.
Of course you need to turn the power to the boiler off first. Then turn it back on when you're done
That's a flame failure error. Definitely a job for a pro
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