Siemens SINAMICS V20 VFD
Siemens SINAMICS V20 VFD code F85: External fault
An external fault has been triggered via the command input, causing the drive to stop the equipment.
- Code
- F85
- Name
- External fault
- Controller
- Siemens SINAMICS V20 VFD
- Type
- Safety interlock
- 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 1 common cause 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 F85 mean?
An external fault has been triggered via the command input, causing the drive to stop the equipment.
Is Siemens SINAMICS V20 VFD code F85 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 F85?
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 Siemens SINAMICS V20 VFD codes
F70 · I/O Extension Module communication faultF71 · USS setpoint fault (on RS232)F72 · USS/MODBUS setpoint fault (on RS485)F80 · Signal lost on analog inputA501 · Current limitA502 · Overvoltage limitA503 · Undervoltage limitA504 · Converter overtemperatureA505 · Converter I2tA506 · IGBT junction temperature rise warning