Question about Honeywell Fan Timer Board St9120c 2010

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The blower controlled by my Honeywell ST1920C controller will not start. I pulled the blower out and plugged it stright in and it works is it the board that is bad?

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  • lrgraves Jan 30, 2010

    Thank you for your quick response. How do i jump the relay?

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  • Honeywell Master
  • 43,501 Answers

Hello,
Yes, the relay in that board does go bad. If the blower works then you know that it is good and if you have power going to the board and the blower does not kick on then replace the board.
I have already just jumpered the blower and left it run so people would have heat till I was able to get a new board.
This is a temporary fix that will not hurt anything, just use a bit more power...at least you can get warm...

Heatman101

Posted on Jan 30, 2010

  • D. Floyd Kolb
    D. Floyd Kolb Jan 30, 2010

    Hi,

    To jump the relay you just need to find the wire that hooks to the "heat tap" on the board.

    Then run a tempoary wire from the line to that wire and it will run your blower continously.

    What you are doing is just what you did to check out your blower.



    Heatman101

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