info HP

Status Ready light: When the product is ready to print, the Ready light is on. When the product is processing data, the Ready light blinks.

Indicates whether the printer is currently in an operational state and if it is busy processing a document or preparing for printing.

? What Causes This

Light states depending on readiness to handle tasks; can indicate standby mode, data handling processes ongoing.

What This Means

No specific action is needed unless light doesn't reflect its typical behavior, in which case review operational status and connectivity checks.

Source: page 72 of the official manual

From the manual

Manual page 72 — HP error Ready light: When the product is ready to print, the Ready light is on. When the product is processing data, the Ready light blinks.

This error code appears in:

HP Laserjet Pro P1102w Printer