oH4 · GA800 · Fault
For oH4 · GA800 · Fault, brand is Yaskawa; model / series is GA800; fault code is oH4; fault name is Motor Overheat Fault (PTC Input); type is Fault, verified against its source on 2026-09-01.
- Brand
- Yaskawa
- Model / series
- GA800
- Fault code
- oH4 verified
- Fault name
- Motor Overheat Fault (PTC Input) verified
- Type
- Fault verified
- Cause
- The motor has overheated. verified
- Corrective action
- • Check the load level, acceleration/deceleration time, and motor start/stop frequency (cycle time). • Decrease the load. • Increase the values set in C1-01 to C1-08 [Acceleration/ Deceleration Times]. • Set E2-01 [Motor Rated Current (FLA)] correctly to the value specified by the motor nameplate. • Make sure that the motor cooling system is operating correctly, and repair or replace it if it is damaged. • Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2, adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid Point A Voltage] and E1-10 [Minimum Output Voltage]. verified
What the source says
oH4 (0020) Motor Overheat Fault (PTC Input) Illuminated Fault 115
— yaskawa.com, retrieved 2026-09-01
Where each value comes from
This source states these in separate places, so each value is shown with the passage that states it.
Cause
The motor has overheated.
Corrective action
• Check the load level, acceleration/deceleration time, and motor start/stop frequency (cycle time). • Decrease the load. • Increase the values set in C1-01 to C1-08 [Acceleration/ Deceleration Times]. • Set E2-01 [Motor Rated Current (FLA)] correctly to the value specified by the motor nameplate. • Make sure that the motor cooling system is operating correctly, and repair or replace it if it is damaged. • Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2, adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid Point A Voltage] and E1-10 [Minimum Output Voltage].
— all from yaskawa.com, retrieved 2026-09-01
Source
- yaskawa.comhttps://www.yaskawa.com/delegate/getAttachment?documentId=TOEPYAIGA8001&cmd=documents&documentName=TOEPYAIGA8001.pdf