Yaskawa V1000 VFD
Yaskawa V1000 VFD code oH1: oH1 Overheat 1 (Heatsink Overheat)
The drive shut down because its heatsink temperature severely exceeded the maximum safe operating limit.
- Code
- oH1
- Name
- oH1 Overheat 1 (Heatsink Overheat)
- Controller
- Yaskawa V1000 VFD
- Type
- Over temperature
- 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 July 22, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- Which manufacturer manual it comes from, linked
- The 5 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 Yaskawa V1000 VFD code oH1 mean?
The drive shut down because its heatsink temperature severely exceeded the maximum safe operating limit.
Is Yaskawa V1000 VFD code oH1 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 Yaskawa V1000 VFD code oH1?
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.