Products stuck in vending coils are the most common complaint in snack vending operations. The customer hears the motor run, the coil turns, and then nothing comes out — or a product hangs tantalizingly at the front of the coil, visible but unreachable. This generates refund requests, location manager calls, and lost sales. The root causes are almost always addressable without replacing the machine or even the coil.
Why Products Get Stuck
Understanding why products hang helps you prevent recurrence.
Too Much Product in the Coil (Overfilling)
The most common cause. When a coil is packed too tightly, the product at the front has nowhere to fall — it’s restrained by the product behind it and by the coil itself. The coil needs to turn far enough that the product clears the front coil support structure and can drop freely.
Rule: Leave 1–2 empty coil positions at the front of each coil. Never fill the coil completely flush with the front.
Wrong Coil Spacing for the Product
Coil pitch (the spacing between coil turns) must match the product’s width. If the pitch is too tight, a wide product gets pinched between coil turns and can’t advance. If the pitch is too loose, a thin product falls into a gap between turns and lies sideways, unable to advance properly.
Bent or Deformed Coil
A coil that was bent during restocking, squeezed by an overloaded product, or damaged during machine transport may have inconsistent spacing or sections that pinch product.
Visual test: Remove all product and hand-rotate the coil while watching for sections where the turns close up significantly or where the coil doesn’t run straight.
Product Shape Mismatch
Some products don’t work well in standard coils:
- Tall, narrow products (slim cans, tall bottles in a snack machine) can tip sideways
- Products with protruding caps or tabs catch on the coil
- Soft packaging (chip bags) can accordion and fold over the front of the coil
- Very light products can be pushed backward by the coil instead of forward
Sticky Product Packaging
Sticky packaging (from adhesive residue, spilled product, or packaging that picks up lint) can cause products to cling to each other and to the coil, preventing clean dispensing.
Quick Check on a Stuck Product
When you find a stuck product during a service visit:
-
Check if the product is truly stuck or just hanging. Sometimes a product hangs with its back edge still in the second coil position. The next motor cycle will drop it. Test by gently tapping the front of the machine.
-
Try a test vend. If you’re in service mode, run a test vend on the stuck column. Watch if the coil fully completes a revolution or stops mid-cycle.
-
Look at the delivery chute. Is a product stuck in the delivery chute rather than in the coil? Reach in (with machine off) and clear any product stuck in the chute.
-
Check the coil rotation. Is the coil physically blocked, or is it the motor that’s not running?
Coil Adjustment Techniques
Most stuck-product problems are resolved through coil adjustment.
Method 1: Adjust Coil Fill Level
The fastest fix: reduce how full you load the coil.
Target: Fill the coil so that the frontmost product sits at least 1–2 coil turns back from the very front of the coil. This leaves clearance for the product to tip forward and drop when the coil turns.
When restocking:
- Count the coil capacity (how many products fit in total)
- Load to 80–85% of capacity maximum
- Leave the front 1–2 positions empty
This alone resolves most hanging-at-the-front issues.
Method 2: Spread the Front Coil Turns
If the front section of the coil has turns that are too close together (tight pitch), the product can’t easily drop off the end. Use pliers to very gently spread the front 2–3 turns of the coil to create more clearance.
Process:
- Remove all product from the column
- Hold the coil with one hand near the area you’re adjusting
- Use needle-nose pliers to grip the coil wire between turns at the front
- Apply gentle outward pressure to increase the spacing by 1/8” to 1/4”
- Check that spacing is now even with the rest of the coil
Caution: Coil wire is under mild tension. Make adjustments gradually. Over-expanding a coil turn makes it too loose and creates the double-vend problem (two products fall at once).
Method 3: Tighten Coil Turns for Loose Spacing
If a coil has sections where turns are spread too far (allowing thin or small products to fall between turns prematurely), use pliers to gently compress the turns in that section.
The correct spacing should be: the product fits in the coil “pocket” with 1/4” to 1/2” of clearance all around. Products should not feel like they could flip sideways or fall between turns prematurely.
Method 4: Adjust the Coil’s Front Anchor Position
The front coil anchor is a bracket or holder at the front of the column that the coil’s front end rests in. If this anchor is too high, too low, or angled wrong, the product path is disrupted.
Check that:
- The front anchor is at the correct height so the coil runs level
- The coil front end is seated in the anchor (not fallen out)
- The anchor itself isn’t bent or broken
If the anchor is damaged, some machines have replacement anchor brackets available. Otherwise, bending it back with pliers is possible for minor deformation.
Method 5: Replace the Coil
When a coil has multiple bent sections, kinks, or uneven spacing throughout its length, adjustment becomes impractical. Replace the entire coil.
Selecting a replacement coil:
- Match the pitch to the product type (see our guide on motor and coil replacement for pitch selection)
- Match the diameter to fit the column width
- Match the length to the column depth
Product-Specific Sticking Solutions
Chip Bags (Most Common Stuck Product)
Chip bags are floppy and can fold over the front of the coil instead of dropping straight. Solutions:
- Use a coil with smaller pitch (tighter turns) that keeps bags upright
- Don’t overfill — chip bags compressed against each other fold more easily
- Some operators fold chips bags in half (hot dog style) which makes them more rigid
Candy Bars and Snack Bars
These should vend easily if coil spacing is right. If they’re sticking, check that the coil pitch matches the bar width. Most bars (Snickers, Kind bars, protein bars) work well with 1” to 1.25” pitch coils.
Jerky Packages
Jerky packs often have non-uniform shapes — bulgy in the middle, flat at the ends. The bulge can catch in a tight coil. Use 1.5” to 2” pitch coils for jerky packs and don’t overfill.
Nuts and Trail Mix Bags (Flexible Packaging)
Similar to chips — flexible bags fold easily. Solutions:
- Tighter pitch to keep bags upright
- Load conservatively
- If available, use a divider insert in the column to keep bags from leaning left or right
Protein Bars and Nutrition Bars
Some high-quality protein bars have slippery, glossy wrappers that slide on each other and on the coil wire. A bit of coil bend (creating slight friction contact) can help, but don’t create so much friction that the coil motor struggles to turn.
Preventing Stuck Products Through Correct Loading
The best remedy is proper loading technique on every restock:
Step 1: Inspect the coil before loading. Run a hand along the coil, checking for bends, tight spots, or loose turns. Fix any issues before loading.
Step 2: Load products upright. Chip bags and flexible packaging should be loaded vertically, not flat. Press them into the coil pocket gently to ensure they’re seated properly.
Step 3: Don’t compress products against each other. Each product should have a little breathing room in its coil pocket. If you have to force products in, the coil is too full.
Step 4: Leave the front positions empty. The last 1–2 coil turns at the front should be empty after loading.
Step 5: Run a test vend after loading each column. Before restocking the next column, run one test vend on the current column to verify product drops cleanly.
Double-Vending: The Opposite Problem
Double-vending (two products dispensed for one selection) is related but opposite to sticking. It occurs when:
- Coil turns are too far apart and a small product falls through
- The home switch stops the coil too early (before one full revolution)
- The front coil position is unrestrained and product at the second position also falls when the first drops
Fix for double-vending:
- Compress the relevant coil turns to reduce spacing
- Check the home switch is stopping the coil at the correct position
- Ensure the front coil anchor properly restrains the product until the moment of vend
When to Replace a Coil
Replace a coil if:
- Multiple sections are bent and won’t hold adjustment
- The coil wire is kinked (a sharp kink, not a gradual bend)
- The coil has corrosion or rust that affects smoothness of rotation
- The end connector to the motor is damaged
- You’ve adjusted the same problem multiple times without lasting fix
Coil replacement is inexpensive ($5–$25 per coil depending on size) and takes about 10 minutes per column. For machines with recurring stuck-product complaints despite adjustment, replacing the worst coils is a worthwhile investment.
FAQ: Stuck Product in Vending Coils
A product is stuck visibly in the coil. Can I just open the machine and pull it forward? Yes, but power off first. Never reach into an energized machine. With the machine off, you can manually advance the coil (turn the coil by hand in the vend direction) to free the product, or simply reach in and nudge the product forward.
How do I know if it’s the coil or the motor that’s causing the stuck product? Turn the coil by hand (machine off). If it turns smoothly, the motor is suspect. If it turns but has a tight spot where it binds, that’s a coil issue. If a product is clearly jammed in the coil (you can see it stuck), that’s a product/loading/coil spacing issue.
My customer says the machine ate their money but nothing came out. Could a stuck product have caused this? Yes. If a product was stuck mid-coil and the motor stopped (couldn’t complete the rotation), the machine’s controller may have logged a jam. In some machines, a detected jam results in a refund; in others, the machine simply logs the error and doesn’t refund. Check whether your machine has guaranteed delivery enabled — if so, it should have attempted a re-vend or issued a refund automatically.
How do I deal with a product stuck in the delivery chute (not the coil)? Power off the machine. Reach into the delivery chute through the customer access and retrieve the stuck product. Check the chute for any residue or deformation that’s causing products to catch. Clean the chute with a damp cloth. If a product burst in the chute, clean thoroughly before restarting.
Parts for Coil Repairs
Fast Vending Machines stocks replacement coils and related parts for major vending machine platforms. Contact us with your machine model and column dimensions for compatibility guidance.
Parts ship free. Machine shipping is $200/unit. We accept bank transfer, Zelle, Chime, and Apple Pay.
Browse our parts selection or contact us for specific coil and vend mechanism parts.
Ready to find the right vending machine?
Browse our full catalog of professionally refurbished and new machines — all tested, warranted, and ready to ship.