Found this online. Maybe this will help OP.
Ailunce 'No Code' Error
The “No Code” error on the Ailunce HD1 typically occurs when the radio is trying to receive a transmission but cannot decode it due to programming discrepancies or encryption settings.
Here are some steps to diagnose and fix the issue:
Verify repeater settings: Ensure that the color code and time slot settings match those of the repeater or other radios you’re trying to communicate with. Mismatches can result in reception errors like “No Code”.
Check code plug settings: Review your code plug settings to ensure that the correct frequencies, PL codes, and repeater settings are programmed. You can do this on the device itself or using the Ailunce code plug software.
Confirm duplex mode: Ensure that the radio is set to duplex mode (TX/RX) and that the box repeater for work mode is checked, indicating that the radio should be in duplex mode.
Update drivers: If you’re experiencing issues with the radio’s drivers, visit the Ailunce support page and download the CH340 driver. Install it according to the instructions to resolve any driver-related errors.
Reset user database: In some cases, the user database may become corrupted, causing the “No Code” error. Try resetting the user database by writing it to the code plug before restoring it. This may resolve any issues with missing user data.
Consult the user manual: Refer to the Ailunce HD1 user manual for specific guidance on troubleshooting the “No Code” error. The manual may provide additional tips and procedures to help resolve the issue.
By following these steps, you should be able to diagnose and fix the “No Code” error on your Ailunce HD1. If the issue persists, consider reaching out to Ailunce support or a local amateur radio community for further assistance.