Nayax common malfunctions & solutions

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 action steps.

Quick help (when you’re in a hurry)

• Make sure your device is registered! Email deaccounts@nayax.com

• Restart the device/machine (disconnect power for at least 30–60 sec).

• Check the SIM card (inserted correctly, clean, working), optimize signal/antenna.

• For “DEX failed”: check/replug the cable, if needed replace the DEX cable or the yellow Nayax cable.

• In the MoMa app: “More” → Reload data.

• If it’s still unclear, contact Nayax support.

Table: Error codes M00–M05 (overview)

M00–M04: recommended steps

M00 – device modem no communication

1. Machine without power (60 sec) → restart.

2. Firmly plug in the connectors on the modem/VPOS.

3. If it happens repeatedly: have support check firmware/profile.

M01 – modem initializing/booting

• Wait 1–2 minutes.

• If the state doesn’t change: restart modem/machine; if needed, check SIM/signal.

M02 – SIM network not reachable

1. Antenna place higher/outside the housing; rule out cable break.

2. SIM insert correctly; if necessary clean/replace.

3. Check provider reception at the location (if needed, test another SIM).

M03 – No internet & SMS connection

1. APN data of the provider check (exact spelling, user/password if required).

2. Adjust network mode/profile (2G/3G/LTE) to the location.

3. Restart; if the error continues → support.

M04 – Only internet connection missing

1. APN/data profiles and roaming settings check.

2. If SMS works but internet doesn’t: often APN wrong or data blocked → contact provider/Nayax.

<a id="m05-detailliert"></a>M05 – No server connection (detailed)

Meaning: The terminal can't reach the server (often SIM/signal/contact issue).

Steps:

1. Open the machine and switch off the main switch.

2. Expose the back of the Nayax device, carefully remove the SIM card.

3. Clean the contacts dry and insert them again correctly.

4. Turn on the machine again, close it and test the connection.

5. If the error persists: reposition/check the antenna; check APN/provider.

Mobile network connection issues (M1/M2/M3 messages)

Typical causes

• Antenna in a bad position, loose or damaged.

• SIM inserted incorrectly, dirty, or defective.

• Terminal has frozen.

Solutions

• Reposition antenna (higher/outside), only plug in the connector, don’t screw it on.

• Check antenna cable for cracks/breaks, replace if needed.

• Insert SIM properly/replace it; disconnect the device from power for 60 seconds → restart.

“DEX failed” – DEX data can’t be read out

First things first: For DEX you need a DEX cable (often not installed in the machine by default).

Procedure

1. Restart vending machine (switch off → on after 30 sec).

2. Restart terminal

   • On the device: Menu → Technician mode → password → Restart

   • Or MoMa app: “Tasks & warnings” → tool icon → Restart device

3. Check cable routing:

   • Unplug and plug back in all connections in the vending machine

   • DEX cable: replace if defective

   • Yellow Nayax connection cable: swap for testing

4. If the error still occurs: Replace terminal (as a last step).

MoMa app: sync takes long / data missing

1. Open MoMa → bottom right “More”.

2. Next to “Last data update” tap the sync icon.

3. “Reload data” → confirm.

“Out of service / Out of order”

1. Restart the machine from scratch (30 sec off → on).

2. Restart terminal (technician mode or MoMa app).

3. If it still persists: clean SIM like in M05 (above).

Terminal only shows the Nayax logo

Often during transport the antenna has come loose from the board.

Steps: disconnect power → open back of terminal → firmly plug in antenna → switch on.

Status “Power Down” (MoMa)

Means: The machine has been shut down – disconnected from power or power outage.

Safety & best practice

• Before working inside the device: switch it off from power.

• APN & SIM plan from the provider ready in written form.

• Don’t squeeze the antenna, pay attention to the kink protection.

• After each step change only one variable and test (better diagnosis).

When should you contact support?

• Recurring M02–M05 despite the steps above.

• Unclear APN/SIM configuration at the provider.

• Suspected hardware defect (modem/terminal/cable).

Nayax support

Nayax contact