Danfoss VLT HVAC Drive FC 102
Danfoss VLT HVAC Drive FC 102 code 251: New type code
The power card or other components were swapped out and the type code changed, causing the drive to stop.
- Code
- 251
- Name
- New type code
- Controller
- Danfoss VLT HVAC Drive FC 102
- Type
- Setup or parameter fault
- What it does
- Warning: the equipment keeps running and flags a problem
- Risk
- GREEN In your wheelhouse
- 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
- The 1 common cause listed for this code
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Danfoss VLT HVAC Drive FC 102 code 251 mean?
The power card or other components were swapped out and the type code changed, causing the drive to stop.
Is Danfoss VLT HVAC Drive FC 102 code 251 dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix Danfoss VLT HVAC Drive FC 102 code 251?
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.
Other Danfoss VLT HVAC Drive FC 102 codes
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