ABB ACS580 VFD
ABB ACS580 VFD code B686: Checksum mismatch
The actual parameter checksums do not match the approved checksums, which prevents the drive from operating.
- Code
- B686
- Name
- Checksum mismatch
- Controller
- ABB ACS580 VFD
- Type
- Setup or parameter fault
- What it does
- Warning: the equipment keeps running and flags a problem
- Risk
- GREEN In your wheelhouse
- Reset
- Clears on its own when the condition goes away
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated November 4, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- What the manual says to do, and the page it is on
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does ABB ACS580 VFD code B686 mean?
The actual parameter checksums do not match the approved checksums, which prevents the drive from operating.
Is ABB ACS580 VFD code B686 dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix ABB ACS580 VFD code B686?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.