IBM H Series Installation And Service Manual page 369

– 0x4n Run-time non-recoverable checkstop error
– 0x5n Run-time recoverable error threshold exceeded (CPU internal errors)
– 0x6n Run-time recoverable error threshold exceeded (L2 single-bit ECC
errors)
where
R=additional reason codes for BIST or POST failures (not used byfield
personnel)
n= number of failures or thresholds exceeded
Appendix C. Service Processor Menus
C-19