Code oH1: Overheat 1 (Heatsink Overheat)
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Overheat 1 (Heatsink Overheat) alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Code type: Fault Manual section: Yaskawa A1000 Troubleshooting Surrounding temperature is too high. - Check the temperature surrounding the drive. - Improve the air circulation within the enclosure panel. - Install a fan or air conditioner to cool the surrounding area. - Remove anything near the drive that might be producing excessive heat. Load is too heavy. - Measure the output current. - Lower the carrier frequency (C6-02). - Reduce the load.
Source: Yaskawa AC Drive A1000 High Performance Vector Control Drive Technical Manual (SIEP C710616 21H)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa A1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code oH1 on the A1000 AC Drive identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Yaskawa's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 280 Yaskawa A1000 AC Drive codes.
Have a better solution?
Help the industrial community by sharing your repair experience for code oH1.
Need a searchable reference for more Yaskawa A1000 AC Drive manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026