Hey there folks. I've installed several uft boiler and I'm getting error 41 due to a plugged fire sides. The intake air is coming from inside the house. The inducer fan and intake pipe has some "dust" init that I believe is causing the problem. I've replaced everything the book said to and turned down the fan speed. So it's not that. The fire sides is about half plugged. I've opened up a few of the other ones I have installed all with the same dusty condition aucuring. All with different intake air supply's. none of this is construction dust. Anyone else having this problem or know of a cleaning soulution? Thanks Nate
