ATM Not Dispensing Cash? Dispenser Jams, Reject Bins, Sensors and Reading the Fault Code
An operator's guide to an ATM that won't dispense — how the dispenser (CDU) works, reading the fault/error code, clearing note jams and cleaning sensors safely, the reject-bin check, and when to call authorized service.
The fast triage (and a safety note)
When an ATM accepts a withdrawal but doesn’t hand over cash, the dispenser failed somewhere in its pick-and-present cycle — almost always a note jam, a blocked sensor, or a reject-bin issue. The fault code tells you which. But because cash is involved, the order of operations matters:
| Do this | Why | |
|---|---|---|
| 1. Reconcile & check the journal first | Cash is involved — audit before touching the mechanism | — |
| 2. Read the fault/error code | Fastest route to the specific cause | — |
| 3. Inspect the feed path for jams | A jammed note is the most common cause | — |
| 4. Check the reject bin & its sensor | Notes diverted there, or a missing/false sensor | — |
| 5. Clean sensors; power-cycle; test | Dust on a sensor mimics a hardware fault | — |
How the cash dispenser works
The cash dispenser unit (CDU) runs a tight cycle for every withdrawal: it picks notes one at a time from a cassette, counts them and checks for doubles with optical sensors, transports them along a feed path, and presents them at the shutter. Any note it can’t verify as a clean single is diverted to the reject bin.
Understanding the cycle explains the symptoms: a jam stops transport; a dirty double-detect sensor mis-reads notes and over-rejects; a missing or mis-sensed reject bin halts the cycle for safety. The fault code maps to the stage that failed.
Reading the symptom
Match the symptom to narrow the cause before you open anything:
| Symptom | Most likely cause | |
|---|---|---|
| Debits but no cash; error logged | Jam, blocked sensor, or notes rejected mid-cycle | — |
| Many notes in the reject bin | Dirty/worn double-detect sensor, or poor-quality notes | — |
| Persistent sensor / misfeed error | Sensor blocked by dust or a jammed note, or failed sensor | — |
| Reject-bin error | Reject box missing, full, or its present-sensor faulty | — |
| Won't dispense, cassette shows notes | Pick failure, transport jam, or low/mis-loaded cassette | — |
| Intermittent under load | Worn pick rollers/belts or a marginal sensor | — |
Step-by-step: clear the common causes
Work the sequence in order, always within your documented procedure and security rules. Stop and escalate if the fault is beyond routine clearing.
- 1
Reconcile and read the code
Balance the cash and review the transaction/journal first. Then read the fault code from the operator/management menu — it names the failed stage.Caution: Cash is involved — always audit and follow dual-control rules before opening the cash area. - 2
Clear note jams in the feed path
Power down the dispenser per the procedure, inspect the feed path, and gently remove any jammed notes without forcing the mechanism. - 3
Check the reject bin
Confirm the reject box is present, not full, and that its present-sensor reads it. Empty and reconcile per procedure if needed. - 4
Clean the sensors
If no jam is visible but a sensor/misfeed error persists, a sensor may be dust- blocked — clear the count and double-detect sensors with short bursts of compressed air. - 5
Power-cycle, test, or escalate
Reconcile cash, power-cycle, and run a test dispense. If the fault persists or points at the mechanism/board/sensor, stop and call authorized service.
Fault codes differ by brand
There is no universal ATM fault-code list — each manufacturer has its own. The code is still your fastest diagnosis, so look it up against your machine’s table:
| Brand / platform | Where to find the codes | |
|---|---|---|
| Hyosung / Nautilus Hyosung | Hyosung error-code reference | — |
| Genmega | Genmega error-code list | — |
| Triton | Triton error-code document | — |
| Tranax | Tranax error-code sheet | — |
| NCR / Diebold Nixdorf | The machine's service documentation / operator menu | — |
Sensors, wear parts and when to call service
When cleaning and clearing don’t fix it, these are the parts that wear or fail in a dispenser — replace via authorized service, matched to your machine:
| Part | Symptom when failing | |
|---|---|---|
| Optical sensors (count/double-detect) | Persistent misfeed/over-reject after cleaning | — |
| Pick rollers / feed belts | Pick failures, intermittent dispense, jams | — |
| Reject bin / present-sensor | Reject-bin errors; cycle halts | — |
| Note cassette | Mis-loading, pick faults from a worn cassette | — |
| Dispenser control board / power | Dead or erratic dispenser — see power-supply guide | — |
For related power and parts sourcing, see our power supply failure guide, and browse repair parts in our terminal repair parts, other parts and power supplies categories. For the ATM card-reader side, see our ATM card reader heads guide. Tell us your ATM model and the fault code and we’ll help identify the right dispenser part — fitted by authorized service.
Frequently Asked Questions
My ATM debits the account but doesn't dispense cash — what's happening?
Where do I start when an ATM won't dispense?
Why are notes ending up in the reject bin?
How do I clear a note jam safely?
What does a 'sensor' error on the dispenser mean?
When should I stop and call authorized ATM service?
Sources & further reading
- Troubleshooting Common ATM Dispenser Errors: Repair vs Replace — Dollar ATM Club
- 5 Common ATM Error Codes and How to Fix Them — ATM Depot
- Hyosung ATM Error Codes Guide — Hyosung (via Scribd)
- Genmega ATM Error Codes — Genmega (via Transnet)
- Triton ATM Error Codes — Triton (via NextATM)
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