Start with the simplest fixes before you call for repair
Most sewing machine problems stop the moment you rethread the needle, clean out lint, or check that the presser foot is down. Before you assume something is broken, run through these five things in order: rethread the top and bobbin, clean the feed dogs and bobbin area with a small brush, make sure the presser foot lever is engaged, check that you are using the correct needle for your fabric, and verify the needle is inserted straight and all the way in. If the machine still will not sew after those steps, move to the sections below that match what you are seeing.
A sewing machine has very few moving parts that actually wear out. Most repairs are either operator error, a clogged machine, or a bent needle. You can fix the first two yourself in under ten minutes. The third costs five dollars.
Key Takeaways
- Rethreading the needle and bobbin, then cleaning lint from the feed dogs and bobbin area, solves roughly half of all sewing machine complaints.
- A bent or dull needle causes skipped stitches, puckering, and thread breakage more often than any mechanical failure.
- The presser foot must be down for the tension discs to engage; if it is up, the machine will not form stitches even though it looks threaded correctly.
- Bobbin tension is almost never the problem; top tension and needle issues cause 90 percent of tension complaints.
- If your machine jams or makes a grinding sound, stop when ready and remove the needle and bobbin — continuing can bend the hook or damage the feed dogs.
The machine skips stitches or makes holes in the fabric
Skipped stitches almost always come from a bent needle, a needle inserted backward or not all the way in, or a needle that is too small for your thread. Check the needle first: remove it, hold it up to the light, and look down the shaft. If it is bent or the eye is damaged, replace it. If it looks straight, reinsert it so the flat side faces the direction your machine manual shows — this varies by brand — and push it all the way up until it stops.
If the needle is fine and correctly inserted, the problem is usually that your needle is too thin for the thread you are using. A size 60 needle cannot carry heavy thread; you need at least a size 80 or 90. Check your thread weight and match it to the needle size on the package. If you are sewing with thick thread and a thin needle, you will skip stitches no matter how well the machine is adjusted.
Rethreading also fixes skipped stitches. Raise the presser foot (this opens the tension discs), remove the thread from the machine entirely, and rethread from scratch. Many people thread with the presser foot down, which means the thread never actually enters the tension discs. The machine looks threaded but is not.
The thread keeps breaking
Thread breaks because it is catching on something, the tension is too tight, or the needle is damaged. Start by checking the needle for burrs or a bent shaft — a damaged needle will shred thread as it passes through. Replace it and try again.
Next, check that nothing is blocking the thread path. Look at the entire route from the spool to the needle: make sure the presser foot is down (so the tension discs are engaged), the thread is seated in every guide and tension disc, and there are no lint balls or thread scraps caught anywhere. A single fiber caught in a tension disc will break thread repeatedly.
If the needle is fine and the path is clear, the tension is too tight. Loosen the top tension dial by one or two numbers and try again. If thread still breaks, loosen it more. Most machines have tension between 0 and 9; start at 5 and adjust from there. Bobbin tension is rarely the culprit — adjust the top tension first.
The machine makes a grinding noise or jams
Stop sewing when ready. A grinding sound means the needle is hitting something, usually the bobbin case or the feed dogs. Continuing will bend the needle, damage the hook, or break the feed dogs — all expensive repairs.
Remove the needle and bobbin, then turn the handwheel toward you slowly by hand. If it turns freely, the jam is cleared. If it still catches, something inside is bent and the machine needs professional repair. If it turns freely, reinsert the needle (making sure it is straight and all the way in) and try sewing on scrap fabric. If the grinding returns, the needle is hitting the presser foot or bobbin case — this usually means the needle is not inserted correctly or is the wrong type for your machine.
The bobbin is not winding or winds unevenly
Check that the bobbin winder is engaged. Most machines have a small lever or button that you flip to set up the winder; if it is not engaged, the bobbin will not turn. Flip it and try again.
If the winder is engaged and the bobbin still does not turn, the bobbin itself may be damaged or not seated correctly. Remove it and check that it is not cracked or warped. Rewind it on a fresh bobbin. If the new bobbin winds unevenly — thick in some spots, thin in others — the tension on the bobbin winder is too loose or too tight. Most machines have a small screw or dial on the bobbin winder; tighten it slightly if the bobbin is too loose, or loosen it if thread is bunching up. Make small adjustments and test between each one.
The fabric puckers or the stitches look uneven
Puckering usually means the top tension is too tight, the needle is bent, or you are using the wrong needle for your fabric. Start by replacing the needle — a slightly bent needle will not show up when you look at it but will still cause puckering. Then loosen the top tension by one or two numbers and sew a test line on scrap fabric.
If puckering continues, check that you are using the right needle type. Woven fabrics need a universal or sharp needle; knits need a ballpoint needle; stretch fabrics need a stretch needle. Using a universal needle on a knit will cause the needle to split fibers, which creates puckering and skipped stitches. Check your fabric type and switch needles if needed.
Uneven stitches — where some stitches are longer or shorter than others — usually come from the feed dogs being clogged with lint or the presser foot pressure being set wrong. Clean the feed dogs with a small brush, then check your presser foot pressure dial. If it is set too low, the fabric will not feed evenly. Adjust it slightly and test on scrap fabric.
The needle will not move or the handwheel is stuck
Turn off the machine and unplug it. Do not force the handwheel. A stuck handwheel usually means the needle is jammed against the bobbin case or feed dogs. Remove the needle and bobbin, then try turning the handwheel slowly by hand. If it still will not move, something inside is bent and you need professional repair.
If the handwheel turns freely once the needle and bobbin are out, reinsert the needle carefully, making sure it is straight and fully seated. Turn the handwheel by hand a few times to verify it moves smoothly before you plug the machine back in and sew.
Frequently Asked Questions
How often should I clean my sewing machine?
Clean out lint after every project, especially if you sew heavy fabrics like denim or fleece. Use a small brush to sweep the feed dogs, bobbin area, and needle plate. If you sew daily, do a deeper clean — removing the bobbin case and brushing inside — once a month. Lint buildup is the number one cause of tension problems and jams.
Can I use any needle in my sewing machine?
No. Universal needles work on most woven fabrics, but ballpoint needles are required for knits, and stretch needles are needed for elastic fabrics. Using the wrong needle type will cause skipped stitches and puckering. Check your machine manual for the needle system it uses — some machines take different needle types than others.
What is the difference between top tension and bobbin tension?
Top tension controls how tight the thread from your spool is pulled; bobbin tension controls how tight the thread from the bobbin is pulled. The two work together to form a balanced stitch. Adjust the top tension dial first — it is easier to reach and fixes most tension problems. Only adjust bobbin tension if the top tension dial does not solve the issue.
Why does my machine work fine on some fabrics but not others?
Different fabrics need different needles and sometimes different tension settings. Lightweight fabrics like silk need a smaller needle and lower tension; heavy fabrics like canvas need a larger needle and higher tension. If your machine works on cotton but not on knit, switch to a ballpoint needle. If it works on light fabrics but not heavy ones, try a larger needle size and slightly higher tension.
When should I take my machine to a professional?
Take it in if the handwheel is stuck and will not turn even after you remove the needle and bobbin, if it makes a grinding noise that does not stop after you clean it, or if it jams repeatedly after you have checked the needle and rethreaded. Also get it serviced if you have not had it cleaned professionally in over a year and you sew regularly — a technician can oil the internal parts and catch problems before they become expensive.