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Understanding Cash Only Error Codes: V00, V01 & V02

Identify your Cash Only or Cashless Out of Order error code - V00, V01, or V02 and follow the guide to restore cashless payments via Nayax Core or MoMa.

General

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Nayax U โ€บ Troubleshooting โ€บ Device Management โ€บ Understanding Cash Only Error Codes

Understanding Cash Only Error Codes: V00, V01 & V02

Nayax device showing Cash Only or Cashless Out of Order? Identify your error code - V00, V01, or V02 - and go straight to the fix that matches it. Each code has a different root cause, so guessing wastes the time you could spend getting cashless back online.

Operators
Nayax Core ยท MoMa
Protocol: MDB
A drinks machine in a busy office break room or sports center switches to Cash Only mid-morning. Cashless shoppers - the ones who don't carry change - walk past it and keep walking. The operator only notices a dip in the day's sales unless they check the screen. The fastest way back to full sales isn't guessing at cables or restarts - it's reading the error code next to Cash Only and going straight to the matching fix, because V00, V01, and V02 each have a different root cause.
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Not sure which error code you have? Check the screen of your Nayax device. The code (V00, V01, or V02) appears alongside the Cash Only message. If it isn't immediately visible, power-cycle the device and watch the screen on startup.
Prerequisites

Before You Start

  • You've checked the device screen and noted the error code showing (V00, V01, or V02).
  • You have access to Nayax Core Management Suite or the MoMa mobile app for your operator.
  • You know which machine and location this device is on, in case you need to escalate.
Diagnose

Identify Your Code

Expand the card that matches your device screen.

V00 No Signal - No MDB communication from the vending machine

A drinks machine shows Cash Only with V00 right after a restocking visit, where the MDB cable was bumped loose while the door was open. V00 means there is no MDB signal at all reaching the Nayax device from the machine - the device is online, it simply isn't hearing from the VMC. Until the signal is restored, every cashless attempt on this machine fails silently.

Most likely cause

A loose or faulty MDB cable between the device and the machine board.

Less obvious, still realistic

Cashless is not enabled on the VMC board itself, or the device is set to the wrong communication protocol - this shows up after a board swap or firmware update, even when every cable is seated correctly.

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First fix to try: Check and reseat the VMC and MDB cables. If Cash Only persists, confirm cashless is enabled on the VMC board and reset the device's communication parameters in Nayax Core.
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How you'll know it's fixed: The Cash Only message clears, the device returns to its normal idle display, and the cashless icon reappears. Run one small test transaction to confirm.

For full click-by-click steps across the POS device and Nayax Core, open the V00 troubleshooting guide. 

V01 VMC-Side - MDB connection inactive, waiting for initialization

A canned-drink machine shows "Cash Only" with V01 right after the site's power comes back on after an outage. The MDB connection exists but is inactive - the VMC hasn't finished its startup sequence yet, so the Nayax device can't process vends until it does.

Most likely cause

The VMC is still completing its startup sequence, most often right after a power cycle.

Less obvious, still realistic

The MDB Flags setting on the device isn't set correctly. This looks identical on screen to a startup delay, but unlike a real delay, it never resolves on its own - mistaking one for the other can leave a machine stuck for days.

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First fix to try: Set MDB Flags to 06 Ignore + Pre Selection on the device via Nayax Core or MoMa. This resolves the great majority of V01 cases.
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How you'll know it's fixed: Give the VMC a couple of minutes after applying the setting - the cashless icon should return, and the Cash Only message clears.

For full platform-specific steps in Nayax Core and MoMa, open the V01 troubleshooting guide.

V02 Reader Off - VMC sent a READER DISABLE command

A snack machine shows Cash Only with V02 after a restock visit, during which the door was left slightly ajar. V02 is not a communication failure - the VMC has actively sent a READER DISABLE command, and cashless stays blocked until the machine sends READER ENABLE.

Most likely cause

An open machine door, or the machine still sitting in service mode after restocking.

Less obvious, still realistic

Pending cash credit left over from a coin jam or partial vend. The VMC won't issue READER ENABLE until that credit is cleared - even once the door is closed and service mode is off, so closing the door alone won't fix it.

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First fix to try: Close the machine door, clear any pending cash credit, and restart the machine. This resolves most V02 cases.
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How you'll know it's fixed: Once READER ENABLE is issued, the Cash Only message clears and the cashless icon returns.

For platform-specific steps on clearing cash credit, open the V02 troubleshooting guide.

Retrieval Aid

Quick Reference: V00, V01 & V02 at a Glance

Code What it means Primary cause First fix to try
V00 No MDB signal from the vending machine to the Nayax device Wrong or faulty cable; cashless not enabled on VMC board; wrong protocol on device Check and reseat VMC and MDB cables
V01 MDB connection inactive, waiting for VMC initialization VMC not completing startup sequence; MDB Flags not set correctly Set MDB Flags to 06 Ignore + Pre Selection
V02 VMC issued READER DISABLE; cashless payments blocked Open machine door; service mode active; pending cash credit; board fault Close door, clear cash credit, restart the machine
Expectation Setting

What Each Dedicated Guide Covers

  1.  
    What the error code means - a plain-language explanation of what's happening between your Nayax device and the vending machine.
  2.  
    Known causes - the conditions that typically trigger this error, ordered from most to least likely.
  3.  
    Step-by-step troubleshooting - numbered steps with platform options where relevant: Nayax Core Management Suite, MoMa, or the POS device directly.
  4.  
    Escalation path - clear guidance on when to contact Nayax Support or your machine manufacturer if self-service steps don't resolve the issue.
Help

Troubleshooting

What does 'Cash Only' or 'Cashless Out of Order' mean on my device?
It's a general out-of-order message shown when your Nayax device can't process cashless payments. The error code (V00, V01, or V02) next to it identifies the specific cause - check your screen before troubleshooting, since each code has a different fix.
How do I find out which error code is showing on my device?
The code appears directly on the device screen next to the Cash Only message. If it's not visible, power-cycle the device and watch the screen on startup.
What's the actual difference between V00, V01, and V02?
V00 means no MDB signal at all is reaching the device - a physical or configuration break.
V01 means a partial connection exists, but the VMC hasn't finished initializing.
V02 means the VMC actively sent a READER DISABLE command. Each needs a different fix.
Can I fix this myself, or do I need a technician?
Most cash-only errors are operator-fixable.
V00 - check cables, confirm cashless is enabled on the VMC board, or reset parameters in Nayax Core.
V01 - change the MDB Flags setting.
V02 - close the door, clear cash credit, and restart. Contact a technician or the machine manufacturer if the self-service steps don't resolve the issue.
Which Nayax platforms can I use to troubleshoot?
Depending on the code, use Nayax Core Management Suite (desktop) or the MoMa mobile app. V00 can also be resolved directly from the POS device in Technician Mode. Each dedicated guide covers the platforms relevant to that code.
What information do I need before contacting Nayax Support?
Your device serial number, the specific error code (V00, V01, or V02), your machine make and model, your operator name as it appears in Nayax Core, and a summary of the steps you've already tried.
Escalation

Still Need Help After Troubleshooting?

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If you've worked through the guide for your error code and the device is still showing Cash Only, contact Nayax Support.
Have your device serial number, error code, and the steps you've already completed ready to share.
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