The Janome 2212 instruction book includes a table for thread breaks, needle breaks, skipped stitches, puckering, loops under the work, poor feeding, a machine that will not work, and noisy operation. Use this guide only for the 2212 and compare it with the manual for your exact machine. The table lists possible causes; it is not a complete diagnosis, and one symptom can have more than one cause.

What you noticeChecks named in the 2212 manual
Needle thread breaksCheck upper threading, whether the tension is too tight, needle condition and insertion, thread and needle suitability, and whether the work is drawn toward the back when sewing ends.
Bobbin thread breaksCheck that the bobbin thread is seated correctly in its case, look for lint, and check whether the bobbin is damaged or turns unevenly.
Needle breaksCheck needle insertion and condition, the clamp screw, and whether the needle thread tension is too tight. Do not pull or push the fabric. The manual also cautions against changing the pattern selector while the needle is in the material.
Skipped stitchesCheck needle insertion and condition, whether the needle and thread suit the work, and upper threading. For stretch, very fine, or synthetic fabric, the manual specifies a Blue Tipped needle; keep that wording specific to this model.
Puckered seamsCheck for tight upper-thread tension, incorrect threading, a needle that is too heavy for the fabric, or stitches that are too coarse. For extremely lightweight material, the manual suggests placing paper underneath while sewing. Test on a scrap first.
Loops below the workThe manual lists loose needle-thread tension or a needle that is too heavy or too fine for the thread. Check threading and the needle/thread pairing before changing tension.
Fabric does not feed smoothlyThe manual lists lint packed around the feed dog or stitches that are too fine. Turn the machine off and unplug it before cleaning.
Machine does not workCheck that it is plugged in, that thread is not caught in the hook race, and that the handwheel was re-engaged after bobbin winding. Follow the manual if thread is caught; do not force a stuck wheel.
Machine runs roughly or is noisyThe table lists thread caught in the hook mechanism or lint packed around the feed dog. Stop and unplug before checking an area that requires opening the machine for routine cleaning.

Start with the part of the setup that matches the symptom, then test on a scrap with the same fabric and layers. Change one setting or component at a time so you can tell whether the result improved. Avoid treating the table’s mention of tension as a command to turn a dial: first confirm the thread path, needle, bobbin, and material setup.

The book’s cleaning instructions are specific to the Janome 2212. If you clean around its needle plate or hook, use the book’s access instructions and power-off precautions; do not transfer its disassembly or oiling steps to a different machine. Cleaning access and oiling rules vary, so use each machine’s own manual.

Stop if the needle strikes, the handwheel resists, the machine jams, or the problem persists after the manual’s user checks. Do not dismantle the machine beyond the tasks the 2212 book explains. Consult Janome or a qualified technician for unresolved, internal, electrical, timing, or damage concerns. For focused explanations, see thread loops under the fabric, skipped stitches on stretch fabric, needle breaks and strikes, or bobbin winding and pickup. For feeding or puckering, follow the 2212 manual’s own symptom entry.