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How to Perform a Self-Diagnostic on Your Sewing Machine Before Visiting a Technician

  • Jul 25
  • 5 min read

Sewing machines are essential tools for sewing enthusiasts, but they require regular maintenance and occasional troubleshooting. Before you rush to a technician for repairs, it's helpful to perform a self-diagnostic to identify common issues. About70% of machines that come in for servicing for not sewing is due to user errors, and thats ok. Its easy to get frustrated and miss little things and its also easy to get comfortable and forget to double check for mistakes. This blog post will guide you through easy steps to diagnose problems, explore solutions, and prepare for your visit to a technician.


Understand Common Sewing Machine Issues


Sewing machines can face a variety of problems, including thread tension inconsistencies, skipped stitches, and unusual noises. Recognizing these issues early can save you time and money.


  1. Thread Tension Problems: Improper thread tension can lead to loose stitches or thread breaks. Check if your top thread is too tight or too loose by pulling it gently. If the top thread is wonky, it can indicate botton tension issues and if the bottom thread is bad then adjusting the top tension could help. If both are off then it can indicate both tension units need attention or something else is the cause. It's all about balance, the stitches should be perfect and meet in the middle evenly.


  2. Skipped Stitches: If your machine frequently skips stitches, it may be due to a dull needle, incorrect needle type, or improper threading. You could be pushing or pulling at the fabric too much or it could be getting caught in something as you sew. It's not always about timing.


  3. Unusual Noises: Pay attention to any grinding or clanking sounds. These noises may indicate a mechanical issue or that something is obstructing the moving parts. A thread jam can easily and quickly mis-lodge a bobbin case and cause the needle to hit it and break, without you even noticing until it is too late.


  4. Machine Not Sewing: If your machine isn't sewing at all, the problem could stem from thread jams, loose motor belt or a faulty foot pedal or power cord.




Sewing test
Sewing test

Performing the Self-Diagnostic


Now that you know the common issues, let's dive into how to conduct a self-diagnostic on your sewing machine. Here are some steps you can follow:


Step 1: Gather Your Tools


Before you begin, gather your basic sewing tools. These generally include:


  • A new needle

  • Scissors

  • Cleaning brush

  • Screwdriver


Having these items on hand will make the diagnostic process smoother.

Basic tools needed for sewing machine maintenance
Basic tools needed for sewing machine maintenance

Step 2: Clean Your Sewing Machine


Dust and lint can cause problems. Start by removing the sewing foot and needle plates. Use a brush to clean out any debris on the feed dogs, around and under the bobbin case and remove and tangles threads from the handheld and needlebar. This is essential for preventing malfunctions due to blockages.


Step 3: Check Threading


Improper threading is a common issue. Rethread the top and bobbin threads, ensuring they go through the correct path according to your sewing machine's manual. Misthreading can lead to skipped stitches or tension problems.


Step 4: Inspect the Needle


If you're experiencing skipped stitches, check the needle. Ensure it is the correct type for your fabric and is not dull or bent. Replace it if necessary. Double check that your needle is in theright orientation and it is threaded correctly. This is a very common mistake easily overlooked, especially for sewists with multiple sewing machines.


Step 5: Test the Thread Tension


Insert a test piece of fabric and use your machine. Adjust the top and bobbin thread tensions while you sew. For cotton fabrics, a standard tension of 4-5 is usually appropriate.


Step 6: Listen for Noises


While testing, listen closely to any unusual sounds. If you hear grinding, it may be time for a more thorough inspection of the gears and motor.


Step 7: Document Your Findings


Take notes on any issues you've encountered. Documenting specific problems will be helpful when discussing your machine's status with a technician.


Preparing for the Technician Visit


Before taking your sewing machine to a technician, you'll want to prepare a checklist of items and questions. This ensures that you have everything you need, making the visit as efficient as possible.


Checklist of Items to Bring


When you visit a technician, ensure you take the following items. (Having these saves me time on sourcing my own and makes me happy):


  • Power Cord: This is crucial for testing the machine.

  • Foot Pedal: Sometimes the pedal can be the source of the problem.

  • Accessories/Attachments: Bring any special feet, atleast one bobbin, or additional tools that you typically use. These can help the technician understand how the machine is used. It's helpful to also have a standard foot for my sewing tests.


  • Needles are not required unless you have a machine that requires specialty needles that are not a standard type.


Key Questions to Ask


When you're meeting with the technician, it's important to communicate effectively. Consider asking the following questions:


  • What is the expected turnaround time for repairs?

  • What is included in the scope of the service?

  • Are there any replacement parts that may need to be ordered?

  • What maintenance or care recommendations can you provide to prevent future issues? I am always happy to chat about sewing machines and will often show you tips on how to prevent future mistakes or how to take care of your machine.

    Erin Gannon
    Erin Gannon

Having this information will prepare you for your service appointment.



My piece of advice I like to give my clients


Once your machine is back home, regular maintenance is key. Here are some tips to keep your machine in top shape:


  1. Regular Cleaning: Clean your sewing machine after every few uses, especially if you’ve been working with fabrics that shed lint....fuzzy and fluffy fleece, sparkly and sequin fabrics ..they like to get into every crevice of your machine and I always find them in their strangest places haha.


  2. Oil the Machine: Follow the manufacturer's guidelines for oiling your machine. This keeps the internal mechanics lubricated and functioning smoothly. Oil the bobbin race every time you sew.


  3. Use the Right Needle and Thread: Different fabrics require different needle sizes and types. Using the right combination will reduce strain on the machine and having the same thread on the top and bottom helps.


  4. Practice Good Threading Habits: Always make sure to thread the machine correctly, as improper threading leads to issues down the road.


  5. Store Properly: Cover your machine to keep dust away when not in use, and always keep it in a stable environment. Do not use your pretty sewing table as a plant stand, the wood does not like moisture.


By taking these steps, you will increase the lifespan of your sewing machine and enjoy a smoother sewing experience.


Final Thoughts on Diagnosis and Maintenance


Performing a self-diagnostic on your sewing machine can save you time and money in the long run. By recognizing the common issues, gathering your tools, and preparing for your technician visit, you equip yourself with valuable knowledge to extend the life of your machine. Regular maintenance and informed communication with your technician can result in improved performance, allowing you to focus on what you love most - sewing!


Sewing is a joy, and taking the time to understand your machine will enrich that experience.


Happy sewing!

Erin Gannon

Sewing machine technician and gatherer of lint

1 Comment

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Unknown member
Aug 28
Rated 5 out of 5 stars.

As a tailor I can tell you that knowing what is wrong with your machine (s) and understanding how to troubleshoot them is very important, and if you know when can save money by doing it yourself that's great, but also recognize when its out of your league before you break something.

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