[Wanderman]

So after a long diagnosis with no help. The culprit was the exhaust stack was full of water.

I have the standard elbow at the roof line, it was about 1/3rd full of water and was causing all sorts of combustion issues.

There is no drain? I added one at the base of the exhaust in the 90 deg elbow.

I will have to check the generator exhaust as well.

Seems like this shouldn't happen.

Main symptom was a lot of smoke coming BACK into the AH bay. When I removed the burner and combustion sleeve and added compressed air (lots of compressed air) I got gurgling and a solid stream from the roof! NASTY stuff too.

Well at least my burner now has all new parts, again.)

[Jack Houpe]

Rick do you think the water came in from the roof exhaust pipe? 1/3 full of water is about 4 feet that sure could be an issue with the generator, now that its drained did you fire the gen off? Wonder why the water didn't drain back through the aquahot as its the lowest point.