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🖨️ Printer Troubleshooting (Partner App)

If your orders are not printing as expected, use this guide to check your printer, Bluetooth connection, and Slerp Partner App settings.

 

At a glance

  • If your printer is not one of our recommended compatible models, issues may be due to compatibility, not the Slerp app.
  • Always check power, paper, and Bluetooth pairing on the tablet before changing app settings.
  • In the Partner App, Auto‑print on acceptance controls whether orders print automatically at acceptance or only when you tap Print on the order.
  • If the printer works with other devices/apps but not with Slerp after these checks, contact Slerp Support with details of what you’ve tested.

1. Check your printer is compatible 

The Slerp Partner App has been tested optimised for the following Bluetooth thermal receipt printers:

  • Munbyn 047PUSEB MFI Bluetooth
  • Munbyn ITPP047P Bluetooth Thermal
  • Star MC-Print3 MCP31LB Bluetooth Thermal
  • Star TSP100 (TSP143IIIBI) Bluetooth Thermal
  • Jolimark TP510 Bluetooth Thermal
  • MHT-P8001 Bluetooth Thermal

If you are using a different Bluetooth printer, it may work, but we cannot guarantee compatibility or support every issue. Check the list of compatible printers here.

2. Basic printer checks

Before looking at the app, confirm the printer itself is working:

  • Power & paper

    • Is the printer switched on?
    • Is there thermal paper loaded correctly and the lid fully closed?
    • Is the paper roll facing the right way (thermal side up)?

  • Test the printer without Slerp

    • If possible, print a test receipt from another device (e.g. your POS or the printer’s built‑in test).
    • If it doesn’t print at all from any device, this is likely a hardware issue, not a Slerp issue.

  • Only one active connection

    • Many Bluetooth printers can only connect to one device at a time.
    • Make sure it is not already paired with a different tablet/phone when you try to use it with your Slerp tablet.

3. Check Bluetooth pairing on the tablet

  1. On your tablet, Tap Account  or the menu icon ☰ → Settings → Bluetooth.
  2. Confirm the printer appears as Paired/Connected and Within range ✅.
  3. If you don’t see it:
    • Turn Bluetooth off and on.
    • Turn the printer off and on.
    • Re‑pair the printer if needed, following the relevant setup guide (Munbyn, Star, Jolimark).

If your printer cannot be seen or paired by the tablet at all, the Slerp app will not be able to print.

4. Check Partner App print settings

Open the Slerp Partner App on your tablet. 

  1. Go to Account > Settings > Print Settings.
  2. Check:
    • Auto-print on acceptance:
      • On – the order should print automatically at the moment you Accept it.
      • Off – you will need to print manually from the order screen.
    • Ensure the correct printer is selected as the Primary printer in Bluetooth settings (if shown).

For pre-orders, if Auto-print is off, the order can be printed on the day of fulfilment when you open the app / view the order.

5. Test the connection between Partner App and printer

Once the printer is paired and settings look correct:

  1. From an existing order

    • Open any Accepted order in the Partner App.
    • Tap Print.
    • Observe what happens:
      • Does the printer wake up / flash / attempt to print?
      • Do you get an error message in the app?

  2. Live test order (recommended)

    • Place a small test order through your Slerp shop.
    • Accept the order on the Partner App with Auto-print on acceptance = ON.
    • Check that:
      • The order appears in the app
      • It prints automatically at acceptance
    • If needed, reject/refund the test order afterwards.

If the printer prints from other apps or POS but not from Slerp, the issue is likely with Slerp app permissions or settings, not the printer.

6. App & tablet resets (soft “hard reset” steps)

If everything looks correct but it still won’t print, try:

  1. Check you’re on the latest Slerp app version

    • Open the App Store (iOS) or Google Play Store (Android) on your tablet.
    • Search for Slerp.
    • If you see an Update button, tap it and wait for the update to complete, then retry printing.

  2. Restart the Slerp Partner App

    • Fully close the app (swipe it away from recent apps).
    • Reopen it and log in again.

  3. Restart the tablet and printer

    • Turn the printer off and on.
    • Restart the tablet.
    • After restart, check Bluetooth is ON, confirm the printer is paired, then repeat the print test from an existing order.

  4. Check Android app permissions (if tablet is Android)

    • Go to Tablet Settings → Apps → Slerp.
    • Check Permissions and ensure the app is allowed:
      • Location
      • Nearby devices
      • Bluetooth / Notifications (if shown)
    • If the app is missing from Location permissions, reinstall the app and allow permissions when prompted.

7. When to contact Slerp Support

If you’ve followed the steps above and it still isn’t printing, contact Slerp Support with:

  • Printer model (e.g. Munbyn ITPP047P, Star MC-Print3, etc.)
  • Tablet type (Android/iOS, brand & model)
  • Whether the printer prints successfully from another device/app
  • What happens when you:
    • Tap Print on an existing order
    • Accept a test order with Auto-print on

This information helps our team quickly see whether it is likely to be a configuration/app issue or a hardware/Bluetooth issue.