text: <s>[INST] Power Flex 525 - Error Code - F109 Mismatch C-P Summary: This fault is not getting reset .Please suggest a solution->Steps taken to remove this fault- 1- Drive Power Reset Done with P53=3 , No Benifit, Temporarily cleared the fault 2- Firmware upgrded to 4.001, No benfit What may be the actual cause of this fault. [/INST] https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1049369/page/1 https://rockwellautomation.custhelp.com/app/answers/detail/a_id/576959/page/1 Please refer to these two Rockwell Technotes. They are listed as access: EVERYONE so you should be able to see them without having a techconnect license. They basically say the control module and the power module aren't talking nicely with each other. Did someone remove and re-install the control module? Or swap it with another one? The second technote describes the method to clear the fault; you have to set the drive back to default parameters and cycle power for the two modules to match up. Be sure to document your drive parameters before performing the default procedure. \\n </s>