Seven-segment display sequence codes and their causes

If an error occurs during the ESM boot process and the Needs Attention LED is on, the numeric display shows diagnostic information as a sequence of two-digit diagnostic codes.

The following figure shows the seven-segment alphanumeric characters.

Figure 1. Seven-segment alphanumeric characters

The following table lists the sequence category codes and their associated detail codes.

Startup errors and operational states are displayed in sequences. The numeric display helps to identify a component failure. Table 1 lists the different sequences and the corresponding errors.

Table 1. Seven-segment display sequence code definitions
Category	Category code	Detail codes
Startup Error	`SE+`	`SE+` Power-on default `dF+` Power-on diagnostic fault `Sx` Power-on validation error
Operational State	`OS+`	`OL+` Offline (See note 1.) `CF+` Component failure (See note 2)
Component Failure	`CF+`	`Hx+` Host card (x = location)
Category Delimiter	`dash+`	Separator between category-detail code pairs (See notes 3 and 4)
End-Of-Sequence Delimiter	`blank-`	End-of-sequence indicator (See notes 5 and 6)
Notes: If an enclosure ID is being displayed, this sequence is programmed to display. The controller is then held in reset. The enclosure ID is nominally displayed during normal operation. This operational state is displayed if an internal controller component failure occurs while the controller is online. An additional detail code identifies the failed component as defined for the Component Failure category. This sequence will continue to display even if the controller is later placed offline (held in reset) to service the failed component. `dash+` All segments are off except the middle segments and the diagnostic light is on. Category-Detail separator is used when there is more than one category-detail pair in the sequence. For examples, see Table 2 `blank-` All segments are off and the diagnostic light is off. End-of-sequence indicator is automatically inserted by hardware at the end of the sequence. Example: `SE+ 88+ blank-` (repeat)

Table 2. Repeating sequences on the seven-segment display and corresponding errors
Repeating sequence	Startup and operational error
Operational failure:
`OS+ OH+ blank-`	The processor temperature exceeds the warning level
Power-on diagnostic failure:
`SE+ dF+ blank-`	Failure of a component that is not a field replaceable unit is detected
`SE+ dF+ dash+ CF+ Hx+ blank`	Failure of a host interface card is detected

The following tables list the ESM diagnostic codes.

Table 3. ESM numeric display diagnostic codes
Value	Description
FF	ESM Boot Diagnostic is running
88	This ESM is being held in Reset by the other ESM
AA	ESM-A application is booting up
bb	ESM-B application is booting up
L0	Mismatched ESM types
L2	Persistent memory errors
L3	Persistent hardware errors
L9	Over Temperature
LL	Cannot read midplane EEPROMs
LP	Missing Drive Port Mapping table
Ln	ESM not valid for enclosure
H2	Invalid/Incomplete Configuration
LF	Lockdown with limited SYMbol support
LH	Controller firmware mismatch
H3	Maximum Reboot Attempts Exceeded
H4	Cannot Communicate with Other ESM
H5	Midplane Harness Failure
H6	Firmware Failure
H9	Non-Catastrophic HW. ESM operational, but in a degraded mode
J0	Incompatible module