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furnace firing issue

LB_481
LB_481 Member Posts: 4
in THE MAIN WALL
furnace is only firing the first 3 burners,it goes out on flame sensor saftey.any ideas on why the last burner would not fire??

Comments

  • RJ_4
    RJ_4 Member Posts: 484
    Gas

    Have  a licensed Hvac contractor check it.   could be low gas press. you could start with your gas co.   alot of them dont charge to check your furnace.

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  • LB_481
    LB_481 Member Posts: 4
    .

    thank you RJ going to check gas pressure today ill post the result.
  • RJ_4
    RJ_4 Member Posts: 484
    pressure

    You need a minimum of 5 inches water column to inlet of most gas valves and 3.5 inches to burner on most  furnaces,  these setting can change if you have a 2 stage valve and on commercial burners. most diaphram style gas valves depend on this 5inch to 3.5 inch pressure drop to operate correctly.

    There was an error rendering this rich post.

  • Steve Whitbeck
    Steve Whitbeck Member Posts: 669
    Dirty burners

    Could just be a dirty cross over on the burners.
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