Troubleshooting Common Issues with the Verifone P400 (M435-003-04-NAA-5): Expert Tips

Troubleshooting Common Issues with the Verifone P400 (M435-003-04-NAA-5): Expert Tips - All-Star Terminals


As a business owner or manager, ensuring smooth payment processing is crucial for customer satisfaction and daily operations. While the Verifone P400 (M435-003-04-NAA-5) is designed for reliability and ease of use, it's not uncommon to encounter occasional issues. In this blog post, we'll cover some common problems and provide expert tips to help you troubleshoot and resolve them.

  1. Connectivity Issues

Problem: The Verifone P400 is not connecting to your network, causing transaction delays or failures.

Solution: Check your internet connection and ensure that the Ethernet cable is securely plugged into the device and the router. If using Wi-Fi, verify that the P400 is connected to the correct network and that the password is accurate. If the issue persists, try restarting the device and the router.

  1. Unresponsive Touchscreen

Problem: The touchscreen on the Verifone P400 is unresponsive or not functioning properly.

Solution: Begin by cleaning the screen with a soft, damp cloth, as dirt or smudges can sometimes cause touchscreen issues. If the problem persists, try restarting the device. If the issue remains unresolved, contact Verifone support for further assistance.

  1. Transaction Declines

Problem: The Verifone P400 is frequently declining transactions, leading to frustrated customers.

Solution: Transaction declines can occur for various reasons, such as incorrect card information, insufficient funds, or expired cards. If you notice an unusual number of declines, contact your payment processor to check for any technical issues or configuration errors.

  1. Device Freezes or Slow Performance

Problem: The Verifone P400 freezes during transactions or operates slowly.

Solution: Restart the device to clear any temporary issues that may be causing performance problems. If the problem persists, ensure that the device's firmware is up-to-date. Contact Verifone support for further assistance if necessary.

  1. Difficulty Integrating with POS System

Problem: The Verifone P400 is not integrating smoothly with your existing POS system.

Solution: Ensure that the P400 is compatible with your POS system and that all necessary software updates have been applied. Consult your POS system's support team or documentation for detailed integration instructions.


While the Verifone P400 (M435-003-04-NAA-5) is a robust and reliable payment solution, occasional issues can arise. By following these troubleshooting tips, you can quickly identify and resolve common problems, ensuring a seamless payment experience for your customers and smooth operations for your business.


Verifone Engage P400 Plus | Pin Pad (M435-003-04-NAA-5)