Here you’ll find the most important Nayax messages (M00–M05) and typical problems like “DEX failed”, “Out of Order”, sync freezes in the MoMa app, and much more – each with concrete steps to take.
Quick help (if you’re in a hurry)Make sure your device is registered! Send an email to deaccounts@nayax.com
Restart the device/machine again (fully disconnect from power for at least 30–60 sec).
Check the SIM card (inserted correctly, clean, working), optimize signal/antenna.
If “DEX failed”: Check/reconnect cable, if needed swap DEX cable or yellow Nayax cable.
In the MoMa App: “More” → reload data.
If you’re still not sure: Contact Nayax Support.
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| Error codeWhat does it mean?What should you do? |
M00 | Device is not communicating with the modem | Device/machine restart; Check modem/cable connection |
M01 | Modem is restarting/initializing | Wait; if it’s permanent: Troubleshooting (below) |
M02 | No connection to the SIM network | Check SIM position/signal; antenna reposition; check APN/provider |
M03 | No connection to Internet & SMS | Check APN/provider; restart; contact support if needed |
M04 | No internet connection (SMS ok) | Check APN/parameters (APN, PIN-free, roaming, 2G/3G/LTE profile); support |
M05 | No server connection | Clean/re-insert SIM, restart → see M05 in detail |
Modem no communicationPower off the machine (60 sec.) → restart.
Firmly plug in the connections to the Modem/VPOS.
If it happens repeatedly: have support check the firmware/profile.
Wait 1–2 minutes.
If the state hangs: Restart the modem/machine ; if needed, check the SIM/signal.
Antenna place higher/outside the housing; exclude cable break.
SIM insert correctly; if needed clean/replace.
Check provider reception at the location (test another SIM if needed).
APN data of the provider, check (exact spelling, user/password if required).
Adjust network mode/profile (2G/3G/LTE) for the location.
Restart; if error persists → contact support.
APN/data profiles and roaming settings, check.
If SMS works, internet not: often APN wrong or data blocked → contact provider/Nayax.
Meaning: The terminal can't reach the server (usually SIM/signal/contact problem).
Steps:
Open the machine open and main switch off.
Expose the back of the Nayax device, carefully remove the SIM card.
Clean the contacts dry, insert them back correctly.
Turn on the machine turn on, close it and test the connection.
If the error continues: reposition/check antenna; check APN/provider.
Typical causes
Antenna unfavorable, loose or damaged.
SIM inserted incorrectly, dirty, defective.
Terminal has frozen.
Solutions
Reposition antenna (higher/outside), plug in the connector only plug in, do not screw in.
Check antenna cable for cracks/breaks, replace if necessary.
SIM insert/replace correctly; disconnect device from power for 60 sec → restart.
Beforehand: For DEX you need a DEX cable (often not installed by default in the vending machine).
Steps
Restart the machine (30 sec off → on).
Restart terminal
At the device: Menu → Technician mode → password → Restart
Or MoMa App: “Tasks & Warnings” → Tool icon → Restart device
Check cables:
Unplug and plug back in all connectors in the machine
Replace DEX cable if defective
Swap yellow Nayax connection cable for testing
If the issue persists: Replace terminal (as a last step).
Open MoMa → bottom right “More”.
Next to “Last data update” tap the sync icon.
“Reload data” → confirm.
Restart machines (restart) (30 sec. off → on).
Restart terminal (technician mode or MoMa app).
If still not working: clean SIM card like in M05 (above).
Often during transport the antenna gets disconnected from the board.
Steps: Disconnect power → Open the back of the terminal → Attach antenna firmly → turn on.
Means: The machine was shut down – disconnected from power or power outage.
Before working on the device: turn off power.
APN & SIM tariff from provider have ready in writing.
Don't squeeze the antenna, mind the kink protection.
After each step, only change one variable and test (better troubleshooting).
Recurring M02–M05 despite the steps above.
Unclear APN/SIM configuration with the provider.
Suspected hardware defect (modem/terminal/cable).
Nayax support: https://www.nayax.com/support
Contact: https://www.nayax.com/contact