Ab Powerflex 4 Fault Codes

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The PowerFlex 40 and 40P drives F81 fault not reset most of time. So, we change the new drive.

Lists all the fault codes and steps to solve the problem. Also has link to download the manuals. Allen Bradley Drive Fault Finder. The PowerFlex 40 and 40P. The only other North American and EU drives I know of that have not been updated for long enough to still use 7 segment 4 digit displays and fault codes boil down to AB PF4/40/400 and 1336, and Siemens Micromaster with older HIMs, or older Siemens Simoreg DC drives.


First check below points:

If there is any way possible to retain the parameters in an Allen Bradley PowerFlex 4 AC drive sent in for repair, we will do so! If your drive has failed at the worst time and you need your PowerFlex 4 VFD repaired quickly, you will find our rush repair option meets your urgent need.


  1. Check the Ribbon cable (Drive to 20-Comm adapter) are connected properly
  2. Check the (RJ45 in drive) RS485 communication cable are connected properly
  3. Check the (RJ45 in drive) HIM Display communication cable are connected properly
  4. Check the 22-Comm adapter indication
Till Fault (F081) not reset. Continuously fault reset by using the reset button or wait 10 to 20 minutes after that reset automatically. Some time fault not clear means new drive or SMPS board (Drive Inside) to be replace.
Powerflex 40 faults
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Powerflex 4 Fault List