Yaskawa GA500 AC Drive
Yaskawa GA500 AC Drive code oH4: Motor Overheat Fault (PTC Input)
The motor temperature exceeded the overheat fault level, causing the drive to shut down the motor.
- Code
- oH4
- Name
- Motor Overheat Fault (PTC Input)
- Controller
- Yaskawa GA500 AC Drive
- 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 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 Yaskawa GA500 AC Drive code oH4 mean?
The motor temperature exceeded the overheat fault level, causing the drive to shut down the motor.
Is Yaskawa GA500 AC Drive code oH4 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 GA500 AC Drive code oH4?
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.