Welcome to Lesson 4 of the HTVRONT E15 Embroidery Machine tutorial series. In Lesson 3, we completed your first hat embroidery project. Today, we're going back to the foundation and mastering the single most important skill in multi-needle embroidery: threading the upper thread.
Every clean stitch, every even tension, every reliable stitch-out starts here. If the thread isn't routed correctly through each guide, tension disc, and take-up lever, you'll see it immediately in the final result — skipped stitches, thread breaks, bird-nesting, or uneven density. Getting the threading right takes a bit of patience the first time, but once you've done it correctly a few times, it becomes second nature.
In this lesson, we'll walk through the complete upper threading path for the E15 15-needle embroidery machine, step by step, with a photo of each stage. Let's begin.
Key Takeaways
Threading follows a numbered path — start from the spool and work your way toward the needle, one guide at a time.
The threading wire from the tool kit is essential for guiding the thread through the enclosed thread guide tube.
Two tension discs must be engaged — one on the upper guide path and one just before the guide tube.
Wrap the thread clockwise around both the thread break detection wheel and the thread tension knob.
The check spring must be hooked correctly — this controls thread tension during needle movement.
Pull-test each thread before stitching to confirm smooth feeding and even tension across all 15 needles.
Before You Begin
Before you start threading, take a moment to review the threading path on the machine itself. Every E15 embroidery machine has a printed threading diagram near the thread stand. Following it as you work through each step will keep you from skipping a guide — which is the most common cause of threading problems.
You'll also want the following items ready:
Your new thread spool — the color you plan to load into this needle position
The threading wire — included in the Tool Kit
Scissors — for trimming thread tails
Pro Tip: Thread one needle at a time. Trying to thread multiple needles simultaneously makes it easy to skip a guide or route the thread to the wrong needle position — and those mistakes are much harder to catch later.
Threading the Upper Thread: Step by Step
Follow these steps in order. The thread path moves from the spool at the top of the machine, through a series of tension discs and guides, and finally down to the needle.
Step 1: Place the Thread Spool
Place the new thread spool upright on the spool holder.
Step 2: Pass the Thread Through the Thread Guide
Pull a length of thread from the spool and pass it through the Thread Guide at the top of the thread stand.
Step 3: Follow the Numbered Guides on the Thread Stand
Follow the numbered guides printed on the thread stand. Each needle position has its own numbered path — make sure your thread follows the path that matches the needle you're loading.
Step 4: Snap Into the First Tension Disc Slot
Snap the thread into the first thread guide tension disc slot from the left.
Step 5: Use the Threading Wire Through the Guide Tube
Take the threading wire from the Tool Kit and use it to guide the thread through the enclosed thread guide tube. This is the step where the threading wire is essential — the tube is too narrow to feed the thread by hand.
Note: If the thread won't pass through the guide tube smoothly, don't force it. Pull the threading wire back out, check that the thread isn't twisted, and try again. Forcing a tangled thread through can damage the tube.
Step 6: Snap Into the Second Tension Disc Slot
Snap the thread into the second thread guide tension disc slot from the left.
Step 7: Wrap Around the Thread Break Detection Wheel
From the right side, wrap the thread clockwise around the thread break detection wheel once. This wheel monitors whether the thread is feeding properly — if a thread breaks during stitching, the wheel stops rotating and the machine pauses.
Step 8: Wrap Around the Thread Tension Knob
Then wrap the thread clockwise around the thread tension knob once. This is where the primary upper thread tension is set.
Step 9: Hook the Thread Into the Check Spring
After that, bring the thread back to the check spring. Hook it into place, and pull it downward. The check spring keeps the thread under consistent tension as the needle moves up and down.
Step 10: Pass Through the Two Thread Guide Holes
Pass the thread through the two thread guide holes on the upper guide bracket.
Step 11: Guide Down Through the Lower Guide Hole
Guide the thread down through the lower guide hole.
Step 12: Pass Through Hole 1 and Hole 2
Pass the thread through Hole 1 between the metal guide rod, then back through Hole 2.
Step 13: Pass Through the Take-Up Lever and Hole 3
From the right side, pass the thread through the take-up lever. Then down through Hole 3. The take-up lever is what controls thread length during each stitch cycle.
Step 14: Insert Into the Last Thread Retainer
Gently lift the last thread retainer and guide the thread into the slot.
Step 15: Thread the Needle
Thread the needle. Leave a 3–4 cm (1.2–1.6 inch) thread tail, and secure it under the thread holder spring.
Pro Tip: If the thread tail is too short, it can slip out of the needle eye during the first few stitches. If it's too long, it can catch on the presser foot or fabric. The 3–4 cm length is the sweet spot — long enough to stay secure, short enough to stay out of the way.
Final Check Before Embroidery
After threading, perform a final check before starting embroidery. These quick verifications catch the most common threading mistakes before they waste thread, fabric, or time.
Confirm each thread follows the correct path for its needle position. Glance along the full thread path from spool to needle — a single misplaced guide will cause noticeable problems.
Gently pull each thread to confirm smooth feeding and even tension. If a thread feels tight or catches, check that it isn't crossed or pinched in a tension disc.
Run the machine at low speed to check that there are no frequent thread breaks. A short test run at 500–600 SPM is enough to catch most issues.
Make sure the thread tails are not caught by the presser foot or embroidery hoop. Loose tails can be pulled into the stitching area and cause tangles.
⚠️ Common threading mistakes to avoid:
Skipping the second tension disc — this causes inconsistent tension and uneven stitches.
Wrapping the thread counterclockwise around the tension knob — always wrap clockwise.
Forgetting to hook the check spring — the thread will feed loosely and cause bird-nesting.
Threading the wrong needle position — always match the thread to the numbered path on the thread stand.
Leaving thread tails that are too long — they can get pulled into the stitching area.
Quick Threading Checklist
Run through these points before starting any embroidery project:
✅ Threading diagram reviewed on the machine
✅ Spool placed upright on the spool holder
✅ Thread passed through the top Thread Guide
✅ Thread follows the correct numbered path for its needle position
✅ Snapped into the first tension disc slot
✅ Threading wire used to pass the thread through the guide tube
✅ Snapped into the second tension disc slot
✅ Wrapped clockwise around the thread break detection wheel
✅ Wrapped clockwise around the thread tension knob
✅ Hooked into the check spring and pulled downward
✅ Passed through both thread guide holes
✅ Threaded down through the lower guide hole
✅ Passed through Hole 1 and back through Hole 2
✅ Passed through the take-up lever and down through Hole 3
✅ Inserted into the last thread retainer slot
✅ Needle threaded with a 3–4 cm tail, secured under the thread holder spring
✅ Each thread pull-tested for smooth feeding and even tension
✅ Low-speed test run confirms no frequent thread breaks
Tutorial Video
Prefer to watch rather than read? Follow along with this complete upper threading tutorial for the E15 embroidery machine:
Conclusion
You've now mastered the complete upper threading path on the E15 embroidery machine. This is the skill you'll use every time you change a thread color, swap to a new spool, or reload a design. Getting the path right the first time saves you from the frustrating troubleshooting that follows a skipped guide or a crossed tension disc.
Practice threading a few needle positions in a row. You'll notice the process becomes faster and more automatic each time. Once you're comfortable with a single needle, working through all 15 becomes far less intimidating.
In the next lesson, we'll cover Quick Bobbin Thread Tension Check - E15 Embroidery Machine Lesson 5 — an essential step for confirming the bobbin side of a balanced stitch. Together with proper upper threading, checking bobbin tension helps ensure consistent stitch quality in every finished piece.
How often do I need to re-thread the upper thread on the E15 embroidery machine?
You'll re-thread whenever you change a thread color or swap to a new spool. With 15 needles, each holds its own color, so you can run multi-color designs without re-threading between color changes. Re-threading is only needed when a spool runs out, when you want to change the color in a specific needle position, or when a thread breaks and needs to be re-threaded. In normal use, a well-threaded machine can go many projects before you need to touch the threading again.
What happens if I skip one of the thread guides?
Skipping a guide usually shows up as tension problems during stitching. Depending on which guide you miss, you might see loose stitches, tight stitches, thread breaks, or bird-nesting under the fabric. The tension discs and check spring control how much resistance the thread feels as it feeds — if the thread bypasses them, tension becomes inconsistent and the machine can't regulate it. This is why the numbered path exists: following it exactly ensures every thread passes through the same guides in the same order.
Can I use the same threading technique for all 15 needles?
Yes — the threading path is identical for every needle position. The only difference is that each needle has its own numbered guide on the thread stand. Follow the same sequence of guides, tension discs, and take-up levers for each thread, but make sure each thread follows the numbered path that matches its needle position. Once you've threaded one needle, you've learned the technique for all 15.
What should I do if the threading wire gets stuck in the guide tube?
Gently pull the wire back out and check for obstructions. Do not force it — the guide tube is thin and can be damaged by excessive pressure. Once the wire is out, inspect the tube opening for lint or thread debris that may have blocked it. Trim the end of the thread to a clean, angled cut so it feeds smoothly through the tube on the next attempt.
Why does my thread keep breaking right after threading?
The most common causes are a skipped guide, incorrect tension disc engagement, or a needle that's been installed incorrectly. Start by checking that the thread passes through both tension discs and the check spring. Then verify the needle is fully seated and facing the correct direction. If the problem persists, check the needle tip for damage — a bent or burred needle will shred the thread on every pass. Finally, confirm that the thread isn't twisted or caught on the spool edge.
Does upper thread tension need to be adjusted differently for different fabrics?
Yes — upper tension often needs adjustment based on fabric weight and thread type. Heavier fabrics like denim or canvas typically require slightly higher tension, while delicate fabrics like lightweight cotton or performance knits need lower tension. The upper tension knob on the E15 allows fine adjustment. Always test on a scrap piece of the same fabric before stitching the final project, and adjust in small increments until the stitch balance looks even.
Keep Learning
Want to master more E15 embroidery techniques and grow your business? These guides will help:
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