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Fix a vending machine that will not accept money

We'll confirm the symptom, rule out power and a full cash box, check for jams, then clean the bill validator and coin acceptor—or tell you when to call a pro.

Troubleshooting · Home appliances
15–30 min
What you'll need
  • Machine keys (to open the cabinet and cash box)
  • Soft lint-free cloth and isopropyl alcohol (for cleaning)
  • Test bills and coins (crisp, clean)
Step 1 of 8

Quick triage — pick your path

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Steps

Goal: Confirm the symptom, rule out power and a full cash box, check for jams, then clean the bill validator and coin acceptor.

  • Try inserting a bill and a coin separately. Note which path fails—bills only, coins only, or both.
  • Good: You know which path rejects. Proceed to Check power and cash box.
  • Bad: The machine has a different problem (e.g. accepts but does not vend). See the appropriate guide for that symptom.

Check power and cash box

Goal: Rule out power loss and a full cash box before opening the acceptance path.

  • Confirm the machine is plugged in and the circuit breaker has not tripped. Check that the display lights up.
  • Open the machine with your key. Locate the cash box and check if it is full. A full cash box stops the machine from accepting more money. Empty it if full.
  • Good: Power is on and the cash box has space. Proceed to Check for jams.
  • Bad: Breaker tripped or cash box full—fix those first. If you do not have keys, call a vending technician.

Check for jams

Goal: Remove any stuck bill or coin that blocks the acceptance path.

  • Inspect the bill validator for a stuck bill in the slot, transport rollers, or stacker. Gently remove any jam. Do not force—you can tear the bill.
  • Inspect the coin acceptor for stuck coins in the slot, path, or coin box. Remove any jammed coins.
  • Good: Path is clear. Retest. If it still rejects, proceed to Bill validator path or Coin acceptor path.
  • Bad: Jam removed—retest. If it accepts now, you are done.

Bill validator path

Goal: Clean the bill validator so it accepts bills.

  • Unplug the machine. Open the bill validator per your model—often a latch or screws. Check your owner’s manual or search “[brand] [model] bill validator service” if unsure.
  • Use a soft, lint-free cloth and isopropyl alcohol to wipe the transport rollers and the optical sensor windows. Do not use abrasive cleaners.
  • Reassemble and test with a crisp, unfolded bill.
  • Good: The validator accepts the test bill. The fix is complete.
  • Bad: Still rejects—the validator may need recalibration or replacement. Call a vending technician.

Coin acceptor path

Goal: Clean the coin acceptor so it accepts coins.

  • Unplug the machine. Open the coin acceptor per your model. Wipe the coin path and sensor areas with a soft cloth and isopropyl alcohol.
  • Check for debris, bent guides, or worn parts. Reassemble and test with clean coins.
  • Good: The acceptor accepts test coins. The fix is complete.
  • Bad: Still rejects—the acceptor may need recalibration or replacement. Call a vending technician.

When to get help

Call a vending technician if:

  • Cleaning and jam removal do not fix it.
  • The bill validator or coin acceptor needs recalibration or replacement.
  • You do not have keys to open the machine.
  • You are not comfortable working inside the unit.

Verification

  • The machine accepts bills and coins without rejecting valid currency.
  • No error codes related to the bill validator or coin acceptor.
  • The cash box has space and the display shows normal prompts.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify whether bills, coins, or both are rejected; rule out a different problem.
  2. Power and cash box Check circuit breaker and that the cash box is not full; both can stop acceptance.
  3. Clear jams Remove stuck bills or coins from the bill path or coin path.
  4. Clean bill validator and coin acceptor Wipe sensors and transport path with isopropyl alcohol; test with good currency.
  5. Call a pro Validator or acceptor needs recalibration or replacement; call a vending technician.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Whether bills, coins, or both are rejected
  • Whether the cash box was full
  • Whether a jam was found and cleared
  • Bill validator and coin acceptor cleaning results
  • Steps already tried

Does the machine reject bills, coins, or both?

Try inserting a bill and a coin separately. Note which path fails.

Try inserting a bill and a coin separately. Bills only: focus on the bill validator. Coins only: focus on the coin acceptor. Both: suspect power, full cash box, or system fault. Proceed to Check power and cash box.

Bills or coins rejected Different problem

You can change your answer later.

Is power on and the cash box not full?

A full cash box stops acceptance. Check the circuit breaker and empty the cash box if full.

Confirm the machine is plugged in and the display is on. Check the circuit breaker. Open the machine and check if the cash box is full—empty it if so. Good: power on and cash box has space. Bad: breaker tripped or cash box full—fix those first.

Yes No

You can change your answer later.

Is there a jam in the bill or coin path?

A stuck bill or coin blocks acceptance. Inspect the bill validator and coin acceptor for obstructions.

Open the machine. Inspect the bill validator for a stuck bill in the slot, rollers, or stacker. Inspect the coin acceptor for stuck coins. Remove any jam gently. Good: path clear. Bad: jam removed—retest. If still rejecting, proceed to clean.

Yes (jam found) No jam

You can change your answer later.

Clear the jam and retest

Remove the stuck bill or coin gently. Do not force—you can tear the bill. Close the machine and retest. If it accepts now, you are done. If it still rejects, proceed to Clean the bill validator or Clean the coin acceptor.

Done

After cleaning, does the machine still reject?

Dirty sensors and transport paths cause rejections. Clean with isopropyl alcohol and a soft cloth, then retest.

Unplug the machine. Open the bill validator and coin acceptor per your model. Wipe the transport rollers and sensor windows with isopropyl alcohol and a soft cloth. Reassemble and test with crisp bills and clean coins. Accepts: fix complete. Still rejects: call a vending technician for recalibration or replacement.

Yes No (accepts now)

You can change your answer later.

Fix complete

The machine accepts bills and coins. No further action needed.

Done

Call a vending technician

If cleaning and jam removal do not fix it, the bill validator or coin acceptor may need recalibration or replacement. Call a vending technician. If you do not have keys to open the machine, you must call a technician.

Done

Call a vending technician or fix power/cash box

If power is off or the cash box is full, fix those first. If you do not have keys to open the machine, call a vending technician. If the problem is different (e.g. machine vends but does not accept), see the appropriate guide for that symptom.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a vending machine not accept money?
Common causes: a full cash box, a jam in the bill or coin path, dirty sensors or optics on the bill validator, debris or bent parts in the coin acceptor, or a failed component. Check power and cash box first, then look for jams and clean the acceptance path.
Can I fix a vending machine that will not accept money myself?
Yes, for basic fixes: check power, empty a full cash box, clear jams, and clean the bill validator and coin acceptor. If the machine uses proprietary software or the validator needs recalibration, a vending technician is usually required.
When should I call a vending technician?
Call a technician if cleaning and jam removal do not fix it, if the bill validator or coin acceptor needs recalibration or replacement, if you do not have keys or access to the cash box, or if you are not comfortable opening the machine.

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