Pro-face RHAA043: Checksum error response for initial communication command

Pro-face HMI Major Communication

Model: GP4000/SP5000 Series | Code: RHAA043

Applicable Systems
GP4000 Series

Symptoms

  • GP-Pro EX display unit shows error RHAA043: Checksum error response for initial communication command.

Possible Causes

  • Device/PLC returned a checksum error for the initial communication command.

Troubleshooting Steps

  1. Step 1: Check communication settings and connected device settings.
    Communication restored and error cleared

How to Reset

Repower or reset the display unit after correcting the root cause.

Related Pro-face Fault Codes

Source: Pro-face GP-Pro EX Maintenance/Troubleshooting Manual, T.7.1 Common Display errors (proface.tech/otasuke official)

Category: HMI