Siemens SINAMICS V20 VFD
Siemens SINAMICS V20 VFD code F3: Undervoltage
The drive has detected an undervoltage condition, causing the booth equipment to stop operating.
- Code
- F3
- Name
- Undervoltage
- Controller
- Siemens SINAMICS V20 VFD
- Type
- Low voltage
- What it does
- Fault: the equipment trips and stops
- Risk
- YELLOW Booth plays by its own rules
- Reset
- Needs a manual reset
- 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 4 common causes listed for this code
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Siemens SINAMICS V20 VFD code F3 mean?
The drive has detected an undervoltage condition, causing the booth equipment to stop operating.
Is Siemens SINAMICS V20 VFD code F3 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 Siemens SINAMICS V20 VFD code F3?
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.