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Replace flame sensor N8MSN0901714B3

2lefthands
2lefthands Member Posts: 1
in Gas Heating

Hello. Any help would be appreciates. Hoping I can do this repair! I have the following furnace:

N8MSN0901714B3

I believe my flame sensor needs to be replaced - looks like the wire is melting?

I think I found the right part, but it has a clip on the end of it and my white wire doesn’t - just seems to connect with a bunch of other wires at the power source.

https://www.technicalhotandcoldparts.com/icp-1190383-flame-sensor-w/-lead/

How do I proceed?


IMG_8977.jpeg IMG_8975.jpeg IMG_8976.jpeg IMG_8978.jpeg

Comments

  • mattmia2
    mattmia2 Member Posts: 13,912

    Show us where it connects to the control board in the blower compartment. also reroute it under the gas line so it isn't as close to the main burner. it looks like it just plugs on to the electrode.

  • 109A_5
    109A_5 Member Posts: 2,596

    Typically the flame sensor is not too hard to replace, looks like only one screw in this case. Looks like the connector has been dilapidated by the heat, which seems odd, maybe there is something else may going on causing that issue, the 1/4" connector on the end of the wire may need to be replaced too. Or the whole wire all the way back to the control board. If that connection is poor the burner may fail to stay lit.

    image.png

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    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • HVACNUT
    HVACNUT Member Posts: 6,960

    Check all Grounds if that sensor cable is burned.

  • Steamheatnewboiler
    Steamheatnewboiler Member Posts: 5

    How did you kmow it was bad?

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