0F3

Explanation
A hard machine check interruption occurred.

System action
The system abnormally ends the task that was running
when the machine check interruption occurred.

System programmer response
Search problem reporting data bases
for a fix for the problem. If no fix exists, contact the IBM® Support Center.

Programmer response
If the data on external storage devices
is still valid, run the job step again.  If the data is not valid,
notify the system programmer.

Source
Machine check handler (MCH)