Question about Brother LB6770 PRW Computerized Sewing Machine

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Error Code: Check and rethread the upper thread

I keep getting an error code, "check and retread the upper thread" but the upper thread is threaded. The manual says to stop and rethread every time but I can't do that for every inch I stitch! Ever heard of this before?

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  • 185 Answers

Yes. It is a sensor on the take up spring. If you miss threading the take up spring you get this error. If take up spring is bent or broken you get this error or if sensor is damaged this error occurs.

Posted on Jan 28, 2015

  • Deb Pfau
    Deb Pfau Feb 14, 2015

    fixed my machine!! turns out it was catching on the side of the frame, wore a small groove in it. put some clear finger nail polish on it to fill it in. I watch it now to make sure it goes to the spring. works wonderful now!

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Posted on Jan 02, 2017

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SOURCE: I keep getting "check and rethread the upper thread" error message

Hi....I also kept getting the check and rethread upper thread message, I\'d sew about 15 stitches and it\'d stop. Here\'s what I did. On the left of the machine, in the back there is a screw....loosen that screw, take cover off, then lift straigt up and out on the cover that has the 3 on it in your threading seqence. Next, I started inspecting and cleaning the thread route from top to bottom. Lo and behold....I get to the place where you come down the front of the machine and turn to go back up and I spot a little slit in the plastic piece so, when I was threading the machine I guess I was pulling it to far to the left causing it to wear a little slit in that piece....so, I finished cutting it off with a utility knife, used an emery board to smooth it down, put the covers back on and it works GREAT!!!! Who would\'ve ever that it\'d be so easy and save me a bunch of money!!! I sure hope this helps someone.

Posted on Jan 07, 2013

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Related Questions:

1 Answer

I have a Singer 160. Was sewing fine then suddenly all I get after three stitches is a C6 error telling me the upper thread is broken but it isn't. I've rethreaded multiple times both upper/lower.


Remove the thread completely from the machine. ALWAYS RAISE the presser foot when threading the upper thread. If the error continues, there may be a piece of thread stuck somewhere in the thread pathway.

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I keep getting check and rethread the upper thread error message i have a embordery machine pe540D


Could be that the sensor is broken or damaged (possibly a check spring located near the take-up lever) or there is some thread or foreign material stuck somewhere.

Read some of the suggested answers below your question.

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Install a brand new needle.

Check the upper tension: Remove the thread. RAISE the presser foot and rethread from the beginning. This ensures the thread is seated properly in the tension disk. Make sure the bobbin case is threaded properly.

If still missing the bobbin thread, it probably has a needle/hook timing issue.

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I just posted this under another Brother machine...mine is a se 350 but, might be the same problem!! Hi....I also kept getting the check and rethread upper thread message, I'd sew about 15 stitches and it'd stop. Here's what I did. On the left of the machine, in the back there is a screw....loosen that screw, take cover off, then lift straigt up and out on the cover that has the 3 on it in your threading seqence. Next, I started inspecting and cleaning the thread route from top to bottom. Lo and behold....I get to the place where you come down the front of the machine and turn to go back up and I spot a little slice/cut in the plastic piece so, when I was threading the machine I guess I was pulling it to far to the left causing it to wear a little slice/cut in that piece....so, I finished cutting it off with a utility knife, used an emery board to smooth it down, put the covers back on and it works GREAT!!!! Who would've ever thought that it'd be so easy and save me a bunch of money!!! I sure hope this helps someone.

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