Understanding Modem Error Codes: M01, M02, M03, M05

Nayax device showing M01, M02, M03, or M05? All modem error codes mean no internet connectivity. Identify your code, hardware fault or network issue, and follow the step-by-step guide to restore connection.

General

COMMUNICATION · TROUBLESHOOTING · ITEM ID 15562

Modem Error Codes: M01, M02, M03, M05

Your Nayax device is showing a modem error, countdown screen, or is frozen on the Nayax logo. All M00x-range codes mean the device has no internet connectivity. Identify your error code below and go straight to the fix.

AUDIENCEOperatorsPLATFORMNayax Core · VPOST · OnyxCATEGORYCommunication
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All M0x-range codes mean the device has no internet connectivity

Cash Only and Cashless Out of Order are the display states shown alongside these errors. The specific code on your device screen - M01, M02, M03, or M05 - identifies whether the issue is a hardware fault or a network-layer problem. Select the matching card below to open the right guide.

How to Use This Guide

Modem error codes fall into two categories: hardware faults (M01, M03/M00, M05), where the issue is with the device's physical components, and network-layer faults (M02/M06), where the device hardware is functional but cannot reach the cellular network or Ethernet.

Select your error code from the cards below. Each card links to a dedicated step-by-step troubleshooting guide. If you are unsure which code is showing, check the device screen - the code appears alongside the Cash Only or Cashless Out of Order message. A countdown screen most often indicates M02 or M06.


  Select your error code

M01
No SIM / Ethernet
Modem Error Codes: M01, M02, M03, M05 HARDWARE
The modem cannot detect a SIM card or Ethernet connection. Usually a hardware fault. Work through four checks in order: SIM card seating, antenna cable, device restart, and Ethernet fallback.
SIM CardAntennaRestart DeviceEthernetNayax CoreVPOST / Onyx
 M03
 M00 / Screen  Frozen 
Modem Error Codes: M01, M02, M03, M05 HARDWARE
Device is frozen on the Nayax logo screen -- the modem is stuck during initialization. A QR code may also appear. Work through four checks in order: SIM card seating, antenna cable, device restart, and Ethernet fallback.
Frozen ScreenSIM CardAntennaRestart DeviceEthernetNayax Core
 M05
 Modem  Fault  
Modem Error Codes: M01, M02, M03, M05 HARDWARE
A failure occurred during the communication process with the modem. A communication-layer hardware fault. Work through three checks in order: SIM card seating, antenna cable, and device restart.
SIM CardAntennaRestart DeviceNayax CoreVPOST / Onyx
M02
M06 / Countdown 
Modem Error Codes: M01, M02, M03, M05 NETWORK
The countdown screen cannot connect to the cellular network or Ethernet. Unlike M01/M05, this is a network-layer issue -- the SIM carrier is unreachable or no Ethernet connection can be established. Work through two steps: replace the SIM card, then switch to Ethernet if needed.
Countdown ScreenSIM ReplacementEthernet FallbackCommunication ModeNayax Core

What to Expect in Each Guide

1
 
What the error code means

A plain-language explanation of what is happening inside the device -- hardware fault vs. network-layer issue -- so you understand the problem before you start.

2
 
Ordered troubleshooting steps

Numbered checks to work through in sequence. Each step includes a YES/NO branch -- if the error clears after a step, you stop. If not, you move to the next check.

3
 
Platform instructions where needed

Steps that require software access include instructions for both Nayax Core Management Suite (desktop) and the VPOST/Onyx device directly, with a video guide where available.

4
Clear escalation path

If all self-service steps are completed and the error persists, the guide tells you exactly what to have ready before contacting Nayax Support.

Quick Reference: All Modem Error Codes at a Glance

Code Type What it means Symptom on screen First fix to try Guide
M01 HARDWARE Modem cannot detect a SIM card or Ethernet connection Cash Only / Cashless Out of Order Reseat the SIM card Open guide ›
M03 / M00 HARDWARE Modem stuck during initialization -- device frozen on Nayax logo Frozen screen / QR code may appear Reseat the SIM card Open guide ›
M05 HARDWARE Failure during the communication process with the modem Cash Only / Cashless Out of Order Reseat the SIM card Open guide ›
M02 / M06 NETWORK Cannot connect to the cellular network or Ethernet -- SIM carrier unreachable Countdown screen / Cashless Out of Order Replace the SIM card Open guide ›

FAQ

FAQ

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