We had a similar problem the other night.
Our boiler called us at 1 am. As she is set not to call during sleeping hours for ash dump requests, I knew it had to be something serious.
As soon as I opened our bedroom door, I could smell the rotten egg smell.
I went to the basement and looked at the CO monitor, it said 0, so hopefully the issue just started.
I looked at the barometric damper, it was pulling open, I checked the breach manometer, it read fine.
I felt the auger tube and it was hot!
I looked at the bulk bag our boiler feeds from, WHOOPS!, we ran it out of coal!
I opened the top of the bag to look in and got a face full of fumes coming up out of the auger tube.
I knocked some coal from the sides of the bag to rebury the auger tube and high tailed it out of the basement.
The good news is that the high auger temperature sensor did its job and called us through the autodialer as soon as the problem started happening.
The autodialer is also set to call if the CO alarm above the boiler goes off, but the auger temperature sensor beat it to it.
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