Service Guide

System shutdown

Refer to Table 18, Table 19, Table 20, Table 21, and Table 22, when experiencing system shutdown related to voltage or temperature problems.

Voltage related system shutdown

Table 18 describes voltage related system shutdowns, their meanings, and suggested actions.

Table 18. Voltage related shutdown messages and actions

Message	Meaning	Suggested Action
System shutoff due to X current over max value	Level-critical; system drawing too much current on voltage X bus	See "Power checkout".
System shutoff due to X current over min value	Level-critical; current on voltage bus X under minimum value	See "Power checkout".
System shutoff due to X V over voltage	Level-critical; system shutoff due to X supply over voltage	Check power supply connectors Replace power supply Replace power backplane
System shutoff due to X V under voltage	Level-critical system shutoff due to X supply under voltage	Check power supply connectors. Replace power supply Replace power backplane
System shutoff due to VRM X over voltage		Replace power supply Replace power supply backplane

Temperature related system shutdown

Table 19 describes temperature-related shutdown messages and suggested actions.

Table 19. Temperature related shutdown messages and suggested actions

Message	Meaning	Suggested Action
System shutoff due to board over temperature	Level-critical; board is over temperature	Ensure system is being properly cooled, see Appendix E, "Specifications". Replace board
System shutoff due to CPU X over temperature	Level-critical; CPU X is over temperature	Ensure system is being properly cooled, see Appendix E, "Specifications" . Replace CPU X
System shutoff due to CPU X under temperature	Level-critical; CPU X is under temperature	Ambient temperature must be within normal operating specifications; see Appendix E, "Specifications".
System shutoff due to DASD temperature (sensor X)	Level-critical; DASD area reported temperature outside recommended operating range	Ensure system is being properly cooled, see Appendix E, "Specifications".
System shutoff due to high ambient temperature	Level-critical; high ambient temperature	Ambient temperature must be within normal operating specifications; see Appendix E, "Specifications".
System shutoff due to system board under temperature	Level-critical; system board is under temperature	Ambient temperature must be within normal operating specifications; see Appendix E, "Specifications".