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Soot on flame sensor

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I’ve got a lp Utica boiler and it is getting a spot buildup on the tip of the flame sensor. It is making it so the furnace won’t fire. I’ll scrape the soot off sensor and it’ll work fine for a week to two then back to same thing. Any ideas what’s causing this ? Appreciate any help !

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 23,442
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    Soot usually indicates that the air/fuel ratio is off -- best to get it properly tuned by someone with the necessary test instruments -- and the knowledge to use them.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    Solid_Fuel_Manratio
  • newhouse34
    newhouse34 Member Posts: 9
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    Ok thanks. Is the air fuel ratio adjusted by a professional make adjustments to the Honeywell sv9501 or to the burner air shutters or both ?
  • Jamie Hall
    Jamie Hall Member Posts: 23,442
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    both. And it can't be done by eye...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • newhouse34
    newhouse34 Member Posts: 9
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    Ok thanks a lot ! Really appreciate it