1. Power Knowledge Center
  2. Event Code Help (F0 - F65)

F28 Code Help - Internal Power Supply

F28 (MMX/MMV): Power Supply Failure

Further Information/Troubleshooting Tips:

  1. Check the function of the heat sink cooling fans (on larger drives that have cooling fans, the fans are normally on while the drive is powered).
  2. Listen for the charging contactor to engage during drive reset.
  3. Check all panel fuses and replace any blown fuses as necessary.

Call PE® if further assistance is needed.