What can cause OHF (overheat detected fault) on an ATS22 Soft Starter?


22 July 2022

OHF on an ATS22 Soft Starter

Product Line:

All models and serial numbers

The Soft Starter is detecting its internal temperature is exceeding the limit.

OHF: overheat detected fault.
If applicable check to make sure that the heatsink fans are running.
Check for dust build up or blockage of air flow into the heatsink fan vent.
Check for environmental conditions such as a very hot mechanical room. 
Check the size of the Soft Starter in relation to the motor. Make sure the Soft Starter is sized correctly. 
Too many starting/stopping of an ATS22 Soft Starter in a short time period can cause over heating issues.