Danfoss VLT HVAC Drive FC 102
Danfoss VLT HVAC Drive FC 102 code 50: AMA calibration failed
The drive cannot operate because the automatic motor adaptation calibration process has failed.
- Code
- 50
- Name
- AMA calibration failed
- Controller
- Danfoss VLT HVAC Drive FC 102
- Type
- General fault
- What it does
- Fault: the equipment trips and stops
- Risk
- YELLOW Booth plays by its own rules
- 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 Danfoss VLT HVAC Drive FC 102 code 50 mean?
The drive cannot operate because the automatic motor adaptation calibration process has failed.
Is Danfoss VLT HVAC Drive FC 102 code 50 dangerous?
It is graded yellow: not hard, but a booth does it differently than the gear most techs know, so follow the checks in order.
How do I fix Danfoss VLT HVAC Drive FC 102 code 50?
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
46 · Power card supply47 · 24 V supply low48 · 1.8 V supply low49 · Speed limit51 · AMA check Unom and Inom52 · AMA low Inom53 · AMA motor too big54 · AMA motor too small55 · AMA parameter out of range56 · AMA interrupted by user
All 73 Danfoss VLT HVAC Drive FC 102 codes · Every fault code