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Hi, I'm Tim, an HVAC expert here to help you resolve your issue. Please provide as much information as you can. Also, I may depend on you to be my "eyes and ears" since I'm not there onsite. At the end of our dialog, when you're satisfied with the answer, you will have a chance to rate my service. Please wait until then. This is HSI ignition, correct? Hot surface ignitor? If so, try cleaning the flame sensor.
This can be "shined up" with some steel wool or emery cloth.
That's because pilot flame is not being sensed by flame sensor.
Is this the pilot system you have?
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I've installed and serviced Burnham boilers for over 30 years. Do you still need help? It sound like you have a couple problems. First is your vent damper. It sounds like you need a new one. Get an aftermarket damper since an OEM damper is usually more than twice the cost. Your other problem is due to a flame sensing problem. Your ignition control isn't getting a signal from the flame sensor in the pilot flame. The electrode in the pilot burner that generates the spark doubles as the flame sensor. You can try carefully cleaning it off with fine aluminum oxide sand paper. If that doesn't work and your connections are good then the next step is to replace the pilot burner assembly.