Troubleshooting Common Banknote Counter Problems: Jams, Miscounts, and False Rejects

When a money counter starts misbehaving, the first instinct is usually to blame the machine. Most of the time it's something simpler: dust on a sensor, a roller that's lost its grip, a stack of notes loaded badly. Those take five minutes to fix. The trick is knowing which problem you actually have before you start taking things apart.

Here's a practical way to work through the most common faults, in the order they're worth checking.

One rule before anything else: switch the machine off and unplug it before you open any panel or reach into the feed path. And if you're not sure what a part does, check the manual for your model rather than guessing.

Paper Jams

Jams are the problem people notice first, and they usually have one of four causes.

Damaged or poor-quality notes. Torn, taped, heavily creased, or stuck-together notes jam almost any machine. If the jam only happens with certain stacks, it's the notes, not the counter. Pull out the worst ones and run the stack again.

Notes loaded badly. A stack that's crooked, too thick, or not squared up will catch at the feed. Square the stack and load it the way your manual shows.

Debris in the feed path. Staples, paper clips, and torn corners get left behind and catch the next note. Clear the path completely, not just the visible bit.

Worn or dirty rollers. If jams happen with clean, undamaged notes, look at the rollers. Dirty ones lose grip, and worn ones can't grip at all. Clean them first. If they look shiny and smooth, they need replacing, not cleaning.

If it jams on good notes and the rollers are fine, the problem is deeper in the feed mechanism and worth a service call.

Double-Feeds and Miscounts

When the count doesn't match what you know is in the stack, check these in order.

1. Check the notes. Stuck-together notes and notes folded over at the corner are the most common reason for a short count.

2. Clean the rollers and the sensors in the count path. Residue makes friction uneven, so two notes pull through together or one gets skipped.

3. Check the setting. On machines with different counting modes, make sure you haven't left it set to one you didn't intend.

4. Count the same stack three times. If the result changes each time, the machine is inconsistent and needs attention. If it's the same every time, the machine may be right and your manual count wrong.

Persistent miscounts after cleaning usually mean worn rollers or a calibration problem.

False Rejects

This is when genuine notes get flagged as suspect, and it's where people most often assume the worst.

Don't assume a flood of bad notes. A jump in false rejects almost always points to dirty or drifting sensors. The fix is usually:

• Clean the sensor windows with the cleaning card or method your manufacturer recommends

• Check the notes for heavy wear, dirt, or marks. Very worn notes can legitimately fail some checks

• Check the currency setting. Running a different currency than the one selected will reject nearly everything

• Recalibrate if your model has the option and cleaning didn't help

If cleaning and recalibration don't bring the rate down, the sensors themselves may be degrading. That's a service issue.

Counterfeit Detection That Seems Off

This one needs more care, because there are two directions to get it wrong.

It rejects good notes. See false rejects above.

It seems to be passing notes it shouldn't. Treat this seriously. Clean the sensors, confirm the currency setting and firmware are current, and test with a note you know is suspect if you have one. If detection still seems weak, stop relying on the machine for that check until it's been looked at. Our counterfeit detection comparison explains what each sensor type catches, which helps you judge whether the machine's detection level matches your risk in the first place.

Machine Won't Start, Stalls, or Shows an Error

Start with the boring checks, because they solve more of these than anything else:

• Is it plugged in, and does the socket work?

• Is the power switch on, and is the cable seated at both ends?

• Is a cover or panel not fully closed? Many machines won't run with one open

• Is the hopper or pocket full or blocked?

For error codes, use the code list in the manual for your specific model. Codes differ between manufacturers and even between models, so a general guess is more likely to mislead than help. Note the code before you restart the machine, because it's useful information if you need to call for service.

When It's Not a Quick Fix

Some signs mean the machine needs a technician rather than another round of cleaning:

• The same fault returns within days of being fixed

• Several different faults are appearing together

• There's noise, burning smell, or vibration that wasn't there before

• Calibration won't hold

• Anything inside the machine looks physically broken

Opening it up further without guidance risks voiding your warranty and damaging sensors that are more delicate than they look. And if repairs are becoming a regular thing, it may be time to ask whether the machine is simply done. Our guide on when to replace cash handling equipment covers how to decide.

Prevention Is Cheaper

Almost every fault above gets less likely with regular cleaning and early roller replacement. If you haven't set up a routine, the maintenance guide for banknote counting machines sets out daily, weekly, and monthly steps by volume.

If you've worked through this list and the problem is still there, → contact us with your machine model and a description of what's happening, or browse our cash handling solutions if it's time for a replacement.

Quick Troubleshooting Checklist

• Machine switched off and unplugged before opening anything

• Notes checked: torn, taped, stuck together, folded

• Stack squared and loaded correctly

• Feed path cleared of debris

• Rollers cleaned, and checked for glazing or wear

• Sensors cleaned with the manufacturer's method

• Currency and mode settings confirmed

• Same stack counted three times to check consistency

• Error code noted from the manual's list

• Service called if the fault keeps returning

Procedures and error codes vary by manufacturer and model. Always follow the documentation for your specific machine.