Siemens SINAMICS V20 VFD
Siemens SINAMICS V20 VFD code F70: I/O Extension Module communication fault
Communication is no longer established with the extension module, causing the drive to stop the booth equipment.
- Code
- F70
- Name
- I/O Extension Module communication fault
- Controller
- Siemens SINAMICS V20 VFD
- Type
- Communication
- 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 F70 mean?
Communication is no longer established with the extension module, causing the drive to stop the booth equipment.
Is Siemens SINAMICS V20 VFD code F70 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 F70?
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
F61 · SD card parameter cloning failedF62 · Parameter cloning contents invalidF63 · Parameter cloning contents incompatibleF64 · Converter attempted to do an automatic cF71 · USS setpoint fault (on RS232)F72 · USS/MODBUS setpoint fault (on RS485)F80 · Signal lost on analog inputF85 · External faultA501 · Current limitA502 · Overvoltage limit