Something Strange keep happening with my Eclassic 2100

[stumper]

I thought I had gone through most issues with this, but lately the roof top vent keeps going askew.  it does not come all the way of but it sits cockeyed.  Move it back into place and it happens again in a few days.

Any thoughts?

[r.man]

I had one that would do that, one day it blew it right out. I just stuck it back in and didn't worry about it. Would go askew once in a while but I ignored it.

[boilerman101]

Check to make sure the copper breather tube that runs through the plastic cap is open. Had a mud dobber make a plug in the tube and had the same thing happen. I just run a wire through the tube and the mud plug pushed out. Vent cap has stayed in place ever since.

[sam-tip]

I have seen my E classic boiler burp.   Burning so good the water boiled deep down in the boiler I think. Water expands by a factor of 17 when going to steam.