Bernette B37 Common Problems and Troubleshooting

Welcome to our guide on addressing common problems and troubleshooting for the Bernette B37 sewing machine. If you own this model, you’re probably familiar with its impressive features and functions.

However, like any machine, it can encounter issues. In this article, we’ll delve into the potential problems you might face while using the Bernette B37 and provide effective solutions to keep your sewing experience smooth.

Bernette B37 Overview

A compact computerized sewing machine, the Bernette B37 offers 50 built-in stitches, ensuring versatility for various sewing projects. Its simple operation and robust construction make it an ideal choice for both beginners and experienced sewers.

Notable features include the practical start/stop function, enabling sewing without the foot pedal, and the needle stop up/down function, useful for sewing corners. You can easily adjust the sewing speed to match your preferences. The bright LED light ensures excellent visibility of your work surface.

Product Details and Features

Product Dimensions19.2 x 16.5 x 11.2 inches
Item model number4336999879

Causes of Common Problems with the Bernette B37

Before we dive into specific problems and solutions, let’s briefly discuss some of the potential issues that Bernette B37 users might encounter. This will set the stage for the subsequent sections, where we’ll address these problems in detail and guide you through troubleshooting steps.

Common Problems and Troubleshooting for Bernette B37

1. Stitch Skipping

Description: Stitch skipping occurs when the machine fails to create a complete stitch, resulting in uneven or missing stitches on your fabric.

Cause: This issue can arise due to incorrect threading, improper needle installation, or a bent needle.


  • Check the threading path and ensure the thread is properly seated in the tension discs.
  • Make sure you’ve inserted the needle correctly, with the flat side facing the back.
  • Replace the needle if it’s bent or dull, as it can cause stitching problems.

2. Uneven Stitch Quality

Description: Uneven stitches can manifest as varying tension or inconsistent stitch lengths.

Cause: Uneven stitching can result from incorrect tension settings, dirty or lint-filled bobbin area, or using the wrong needle for the fabric.


  • Check the tension settings and adjust according to the fabric you’re using.
  • Clean the bobbin area and remove any lint or debris that might affect the stitch quality.
  • Ensure you’re using the appropriate needle type and size for the fabric.

3. Thread Jamming in Bobbin Area

Description: Thread getting jammed or tangled in the bobbin area can disrupt your sewing process.

Cause: Incorrectly wound bobbins, improper bobbin insertion, or tangled thread can lead to thread jams.


  • Wind bobbins following the machine’s instructions, ensuring even tension.
  • Insert the bobbin correctly, making sure the thread unwinds in the correct direction.
  • Clear any tangled thread and re-thread the machine.

4. Machine Not Powering On

Description: The machine doesn’t respond when you try to power it on.

Cause: Issues with power supply, loose connections, or a malfunctioning power switch can cause this problem.


  • Check the power outlet and ensure it’s working. Try a different outlet if needed.
  • Inspect the power cord for any damage or loose connections.
  • If the power switch seems faulty, contact customer support for further assistance.

5. Bobbin Thread Not Catching

Description: The upper thread forms stitches, but the bobbin thread doesn’t interlock, leading to loose threads on the fabric.

Cause: Incorrectly threaded bobbin, bobbin tension issues, or lint buildup in the bobbin case can result in this problem.


  • Re-thread the bobbin, following the machine’s threading path carefully.
  • Check bobbin tension and adjust it if needed, consulting your machine’s manual.
  • Clean the bobbin case area from any lint or debris that might affect the bobbin thread’s movement.

6. Bobbin Won’t Wind Properly

Description: The bobbin winding process doesn’t work as expected, leading to unevenly wound bobbins or thread tangling.

Cause: Improper bobbin placement on the winding spindle, threading errors, or a malfunctioning bobbin winder can cause this issue.


  • Ensure the bobbin is correctly placed on the winding spindle.
  • Check that you’re following the correct threading path for the bobbin winding process.
  • If the bobbin winder is malfunctioning, contact customer support for assistance.

7. Thread Breaking During Sewing

Description: The thread keeps breaking while you’re sewing, causing frustration and interruptions.

Cause: Incorrect thread tension, using low-quality thread, or a rough needle can lead to thread breakage.


  • Adjust the thread tension according to the fabric and thread you’re using.
  • Use high-quality thread to minimize breakage.
  • Replace the needle with a new one if it’s rough or damaged.

8. Uneven Feed Dog Movement

Description: The feed dogs, responsible for moving the fabric, don’t move evenly, resulting in fabric feeding issues.

Cause: Dust and debris accumulation under the feed dogs, damaged feed dog teeth, or incorrect presser foot pressure can cause uneven movement.


  • Clean under the feed dogs to remove any lint or debris that might obstruct their movement.
  • Inspect the feed dog teeth for damage and replace them if necessary.
  • Adjust the presser foot pressure to ensure smooth fabric feeding.

9. Needle Threader Malfunction

Description: The automatic needle threader fails to work, making it difficult to thread the needle.

Cause: Misalignment of the needle threader mechanism, bent or damaged needle, or incorrect use of the threader can cause this problem.


  • Check the alignment of the needle threader and adjust it if needed.
  • Ensure the needle is straight and not damaged.
  • Follow the correct steps for using the needle threader as outlined in the machine’s manual.

10. Limited or No Stitch Selection

Description: The machine doesn’t respond when you attempt to select different stitches, or it’s stuck on a single stitch.

Cause: Button or control panel malfunction, software issues, or a disconnected stitch selection mechanism can lead to this problem.


  • Check if any buttons or controls are stuck or unresponsive.
  • Restart the machine and ensure it’s updated with the latest software.
  • Inspect the stitch selection mechanism and ensure all connections are secure.

11. Thread Tension Inconsistency

Description: The tension of the upper and lower threads is uneven, leading to unbalanced stitching.

Cause: Incorrect tension settings, lint buildup in the tension discs, or using different thread weights can cause tension inconsistency.


  • Check and adjust the upper and lower thread tensions to match the fabric and thread you’re using.
  • Clean the tension discs to ensure smooth thread movement.
  • Use threads of similar weights in the upper and lower parts to maintain balanced tension.

12. Noisy Operation

Description: The sewing machine makes unusual noises while in operation, which can be distracting.

Cause: Loose components, inadequate lubrication, or foreign objects in the machine can lead to noisy operation.


  • Tighten any loose screws, nuts, or bolts that might be causing the noise.
  • Check the machine’s manual for lubrication points and apply lubricant as recommended.
  • Inspect the machine’s interior for any debris or foreign objects and remove them.

13. Skipped Stitches on Thick Fabrics

Description: The machine skips stitches or struggles to sew on thicker fabrics.

Cause: Insufficient needle penetration, incorrect needle type, or inadequate presser foot pressure can lead to skipped stitches on heavy fabrics.


  • Use a needle specifically designed for heavy fabrics to ensure proper penetration.
  • Adjust the presser foot pressure to allow the fabric to feed smoothly.
  • Choose appropriate thread and adjust the stitch length for thicker fabrics.

14. Jammed Reverse Stitch Lever

Description: The reverse stitch lever gets stuck or doesn’t engage properly.

Cause: Dirt accumulation, misalignment, or mechanical issues can cause the reverse stitch lever to jam.


  • Clean around the reverse stitch lever to remove any dirt or debris.
  • Inspect for misalignment and adjust if necessary.
  • If the lever is still jammed, consult the machine’s manual or contact customer support.

15. Thread Looping on the Underside

Description: Loops of thread appear on the underside of the fabric, affecting the stitch quality.

Cause: Incorrect threading, bobbin tension issues, or improper needle installation can cause thread looping.


  • Re-thread the machine, ensuring the thread follows the correct path.
  • Check and adjust the bobbin tension as needed.
  • Make sure the needle is inserted properly and facing the correct direction.

16. Uneven Buttonhole Stitches

Description: Buttonholes are sewn with inconsistent stitch density or length.

Cause: Incorrect buttonhole settings, improper fabric positioning, or a malfunctioning buttonhole foot can result in uneven stitches.


  • Ensure you’ve selected the correct buttonhole setting and stitch length.
  • Position the fabric accurately in the buttonhole foot.
  • If the buttonhole foot is causing issues, clean it and ensure it’s attached properly.

17. Fabric Doesn’t Feed Properly

Description: The fabric doesn’t move smoothly through the machine while sewing.

Cause: Dirty or worn feed dogs, incorrect presser foot pressure, or insufficient tension can lead to feeding issues.


  • Clean the feed dogs to remove dirt and debris that might hinder fabric movement.
  • Adjust the presser foot pressure to allow proper fabric feeding.
  • Check and adjust the tension settings to prevent fabric slippage.

18. Needle Breakage

Description: Needles frequently break while sewing.

Cause: Using the wrong needle for the fabric, sewing at high speeds, or hitting pins can cause needle breakage.


  • Ensure you’re using the appropriate needle type and size for the fabric you’re sewing.
  • Sew at a moderate speed, especially when working with thicker fabrics.
  • Remove pins before they come into contact with the needle.

19. Machine Freezing or Stalling

Description: The sewing machine freezes or stalls during operation.

Cause: Software glitches, overloaded machine memory, or tangled thread can lead to freezing or stalling.


  • Turn off the machine, wait a few seconds, and then turn it back on to reset the software.
  • If you’re working on complex designs, consider breaking them into smaller segments to avoid overloading the memory.
  • Check for tangled thread or obstructions that might be causing the machine to stall.

20. Thread Bunching on the Underside

Description: Excess thread gathers underneath the fabric, creating a messy appearance.

Cause: Incorrect threading, incorrect bobbin placement, or bobbin tension issues can result in thread bunching.


  • Re-thread both the upper thread and the bobbin thread, following the correct threading paths.
  • Ensure the bobbin is inserted correctly and that the thread unwinds in the right direction.
  • Check and adjust the bobbin tension to prevent excessive thread gathering.

21. Needle Hits the Presser Foot

Description: The needle hits the presser foot or needle plate while sewing.

Cause: Incorrect needle installation, using the wrong presser foot, or incorrect stitch settings can lead to needle hitting issues.


  • Ensure the needle is inserted correctly, with the flat side facing the back.
  • Use the appropriate presser foot for the selected stitch and fabric.
  • Check the stitch settings to ensure they match the chosen presser foot and needle.

22. Uneven Thread Tension on Zigzag Stitches

Description: Zigzag stitches have inconsistent thread tension, resulting in uneven and messy stitches.

Cause: Incorrect tension settings, thread snags, or fabric misplacement can cause zigzag stitches to be uneven.


  • Adjust the thread tension to achieve balanced zigzag stitches.
  • Ensure the thread doesn’t catch on any rough edges or burrs in the machine.
  • Position the fabric correctly to prevent distortion during zigzag stitching.

23. Bobbin Runs Out Too Quickly

Description: The bobbin thread seems to run out faster than expected.

Cause: Incorrect bobbin tension, using low-quality thread, or winding the bobbin too loosely can lead to quicker bobbin depletion.


  • Check and adjust the bobbin tension to prevent excessive thread consumption.
  • Use high-quality thread for winding the bobbin to avoid frequent replacements.
  • Ensure the bobbin is wound tightly and evenly to maximize thread usage.

24. Fabric Doesn’t Gather Properly

Description: Attempted gathers result in uneven or no gathering of the fabric.

Cause: Incorrect stitch settings, improper gathering foot usage, or inadequate thread tension can hinder proper fabric gathering.


  • Choose the appropriate gathering stitch and adjust the settings as needed.
  • Ensure you’re using the correct gathering foot and that it’s attached securely.
  • Check the thread tension to ensure it facilitates smooth gathering.

25. Needle Thread Keeps Breaking

Description: The needle thread breaks repeatedly during sewing.

Cause: Incorrect threading, using poor-quality thread, or needle-bar height issues can result in frequent needle thread breakage.


  • Re-thread the machine, following the proper threading path carefully.
  • Use high-quality thread to reduce the likelihood of thread breakage.
  • Check the needle-bar height and adjust it if necessary to prevent unnecessary tension on the thread.

Bernette B37 Sewing Machine User Reviews

Positive Reviews from Bernette B37 Sewing Machine Users

  • Many users were satisfied with the ease of use and versatility of the Bernette B37.
  • Some users appreciated the built-in thread cutter and additional foot that came with the machine.
  • Customers mentioned that the machine produces consistent and dependable stitching outcomes.
  • Several users found the Bernette B37 to be suitable for both beginners and intermediate sewists.
  • Users liked the overall quality and design of the machine, considering it a great value for the price.

Overall, the majority of users expressed positive feedback about the Bernette B37 sewing machine, highlighting its user-friendly features, reliable performance, and good value.

Negative User Reviews of the Bernette B37 Sewing Machine

  • Some users reported issues with the machine’s ability to handle heavy fabrics, such as denim and fleece.
  • A few customers experienced difficulties with navigating the machine’s instructions, finding them to be complex.
  • One user mentioned a broken piece of plastic casing upon receiving the machine.
  • Another customer’s machine experienced malfunctioning after a short period of use.
  • A user expressed disappointment with the warranty policy, as their warranty claim was denied due to not purchasing directly from a dealer.

While the majority of users had positive experiences with the Bernette B37 sewing machine, there were a few instances of negative feedback regarding its ability to handle heavy fabrics and some quality-related issues.

Based on the reviews, the Bernette B37 sewing machine received predominantly positive feedback, with users praising its ease of use, dependability, and value for money.

While some negative experiences were reported, the overall sentiment indicates that the Bernette B37 is a popular choice for sewists looking for a user-friendly and reliable sewing machine.

Bernette B37 Sewing Machine Manual

The operating instructions and user manual for the Bernette B37 sewing machine can be found on the manufacturer’s official website. You can access the manual to learn about the machine’s features, settings, maintenance, and troubleshooting guidelines.

It’s recommended to refer to the manual for comprehensive information on how to use and maintain your Bernette B37 sewing machine.

Frequently Asked Questions

1. Why is my Bernette B37 sewing machine not turning on?

There could be several reasons for this issue. Make sure the power cord is properly connected and the power outlet is functioning. Check the power switch and ensure it’s in the “on” position. If the problem persists, consult the user manual or contact customer support.

2. Why does my thread keep breaking while sewing?

Thread breakage can be due to incorrect tension settings, using low-quality thread, or a rough needle. Adjust the thread tension according to the fabric you’re using and ensure you’re using high-quality thread. Also, check the needle condition and replace it if necessary.

3. How do I clean and maintain my Bernette B37 sewing machine?

Regular maintenance involves cleaning the machine’s exterior and interior, removing lint and dust, and oiling the designated points as mentioned in the manual. Follow the maintenance instructions in the user manual for proper care to ensure optimal performance.

4. My stitches are uneven and puckered. What can I do?

Uneven stitches can result from incorrect tension settings, improper threading, or using the wrong needle. Check the upper and lower thread tensions, re-thread the machine following the correct path, and ensure you’re using the appropriate needle for the fabric you’re sewing.

5. Why is my Bernette B37 sewing machine making unusual noises?

Noises during operation could be due to loose components, lack of lubrication, or debris inside the machine. Tighten any loose parts, lubricate the machine as per the manual’s instructions, and check for any foreign objects that might be causing the noise.


For any issues or problems you encounter with your Bernette B37 sewing machine, it’s always advisable to refer to the user manual for specific troubleshooting steps. Additionally, you can reach out to the manufacturer’s customer service or visit an authorized service center for professional assistance.

Proper maintenance and following the guidelines can help ensure smooth and enjoyable sewing experiences with your Bernette B37.

Bernette 05 Crafter Common Problems

KPCB Tech FHSM-201 Common Problems

KPCB Tech 505 Common Problems

1 thought on “Bernette B37 Common Problems”

  1. Bernette b37
    Auto-lock button No directions for this.
    Do I press once or hold it down? How many stitches will it make in place?
    Either way, it keeps making stitches before it engages to straight stitching. Most of the time, I have to stop sewing and then stop sewing and it makes about 8 stitches in place. I don’t think it is supposed to work this way. I just got the sewing machine back a week ago from having a free check up from the shop where I bought it – Cotton Patch, Lafayette, CA
    Please help


Leave a Comment