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  • Replacing obsolete limit switch

    Posted by Anonymous on November 2, 2023 at 6:34 pm

    I have a trane xr90 furnace and I’m getting the code (4 flashes) of an open high limit device. I found out that the limit switch is obsolete and I was provided with a sensor; sat. line 2124 for a replacement. My question is How do I hook this up to my furnace being that the connector is completely different and so is the switch itself.?

    fixbear replied 3 weeks, 3 days ago 3 Members · 2 Replies
  • 2 Replies
  • Tito

    November 3, 2023 at 4:38 pm

    Do you have any pictures.

  • fixbear

    November 7, 2023 at 8:10 pm

    Have you got the TUX number and is it mounted for up flow, downflow, or horizontal? The limit switch is just a temp sensing NC two wire switch to protect the plastic exhaust piping.

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