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

Issue:
What can cause OHF (over heat detected fault) on an ATS22 Soft Starter?

Product Line:
ATS22

Environment:
All models and serial numbers

Cause:
The soft starter is detecting its internal temperature is exceeding the limit.

Resolution:
OHF: over heat 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 that the size of the soft starter in relation to the motor.
Too many starting/stopping of an ATS22 softstart can cause over heating issues.
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