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Note: See “System replaceable units” on page 117 to determine which components should be replaced by a field
service technician.
Message Action
System shutoff due to x V under voltage
(level-critical; system shutoff due to x
supply under voltage)
1. Check the power-supply connectors.
2. Power supply.
3. Power cage assembly, if installed.
System shutoff due to VRM x over
voltage
v Replace VRM x.
System shutoff due to excessive (< 240
VA) loading
1. See “Power checkout” on page 22.
2. Cycle ac on/off.
Temperature-related system shutdown
Note: See “System replaceable units” on page 117 to determine which components should be replaced by a field
service technician.
Message Action
System shutoff due to board over
temperature
(level-critical; board is over temperature)
1. Ensure that the system is being properly cooled; see “System
reliability considerations” on page 23.
2. Replace board.
System shutoff due to CPU x over
temperature (level-critical; CPU x is over
temperature)
1. Ensure that the system is being properly cooled; see “System
reliability considerations” on page 23.
2. Replace microprocessor x.
System shutoff due to CPU x under
temperature (level-critical; CPU x is under
temperature)
v Ambient temperature must be within normal operating
specifications; see “Features and specifications” on page 3.
System shutoff due to DASD temperature
(sensor x) (level-critical; DASD area
reported temperature outside recommended
operating range)
v Ensure that the system is being properly cooled; see “System
reliability considerations” on page 23.
System shutoff due to high ambient
temperature
(level-critical; high ambient temperature)
v Ambient temperature must be within normal operating
specifications; see “Features and specifications” on page 3.
System shutoff due to system board
under temperature
(level-critical; system board is under
temperature)
v Ambient temperature must be within normal operating
specifications; see “Features and specifications” on page 3.
Hard disk drive checkout
Note: See “System replaceable units” on page 117 to determine which components should be replaced by a field
service technician.
Message Action
Hard drive x removal detected
(level-critical; hard drive x has been
removed)
v Information only; take action as appropriate.
Chapter 6. Symptom-to-FRU index 111