Item | Color | Name | Interpretation |
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| Off = Controller is in an idle or runtime state. |
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| Flashing 5 Hz = Controller and cache are performing a backup. |
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2 | Red | Fault | When an error occurs, this LED is on. During power up, this LED |
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| is solid for up to 2 seconds. |
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3 | Green | Heartbeat | When the controller is in good health, this LED flashes at 1 Hz. |
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| During power up, this LED is solid for up to 2 seconds. |
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P421 LEDs
Item | Color | Name | Interpretation |
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1 | Green | Heartbeat | When the controller is in good health, this LED flashes at 1 Hz. |
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| During power up, this LED is solid for up to 2 seconds. |
2 | Red | Fault | When an error occurs, this LED is on. During power up, this LED |
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| is solid for up to 2 seconds. |
3 | Amber | Debug | On = Controller is in reset. |
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| Off = Controller is in an idle or runtime state. |
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| Flashing 5 Hz = Controller and cache are performing a backup. |
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Component identification 20
