Siemens SINAMICS V20 VFD
Siemens SINAMICS V20 VFD code A504: Converter overtemperature
The converter temperature warning level is exceeded, which reduces the output frequency while the booth equipment continues running.
- Code
- A504
- Name
- Converter overtemperature
- Controller
- Siemens SINAMICS V20 VFD
- Type
- Over temperature
- What it does
- Warning: the equipment keeps running and flags a problem
- Risk
- GREEN In your wheelhouse
- Reset
- Clears on its own when the condition goes away
- 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 3 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 A504 mean?
The converter temperature warning level is exceeded, which reduces the output frequency while the booth equipment continues running.
Is Siemens SINAMICS V20 VFD code A504 dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix Siemens SINAMICS V20 VFD code A504?
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.