0A4

Explanation
Two or more processors could not complete external
time reference (ETR) synchronization check processing. ETR is the MVS™ generic name for the IBM® Sysplex Timer (9037) or equivalent.

System action
The system enters wait state X'0A4'.
This wait state is accompanied by message IEA503W.

Operator response
Retain the logrec error records. Contact hardware
support.

Source
Timer supervision