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little yellow flashes in flame (Munchkin)

. Member Posts: 80
I looked through the window, and while the color is mostly blue, there are little yellow flashes that come and go quickly. The boiler is running at full (no modulation) during this time; I haven't studied it at lower firing rates.

Are little yellow flashes a sign of anything bad? (I am trying to get a combustion analysis done, but my installer is unresponsive. As I mentioned in another post, I'm gtting rather poor efficiency.)


  • Mark Hunt
    Mark Hunt Member Posts: 4,909
    Yellow flashes

    Until a combustion analysis is performed, I can't really tell you what is causing the flashes. Probably has to do with the fuel mixture.

    Have you tried contacting HTP to see if there is anyone else in your area to perform the proper set up?

    Mark H

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  • Weezbo
    Weezbo Member Posts: 6,232
    I just came back from snappin some photos of a HO

    install my buddy wired up for them*~/:) and helped them with the radiant garge slab layout ...its sorta cool :)condensing and running like a top:) doesnt your gas company have a tech that comes by and makes sure it is running correctly? i thought that was standard in the natural gas industry,sorta a double check on new installs...
  • jerry scharf_2
    jerry scharf_2 Member Posts: 414

    My initial thought is that you are sucking dirt/dust into the system, and the yellow flashes are that burning up. You made a comment elsewhere about black stuff in the combustion area, which would be consistent with this as well.

    Where is the air intake for the unit? What are the conditions around the air intake?

This discussion has been closed.