The printer has a blue screen with a power icon and error B8493FE4. both lights on display are flash

[ck1974]

The printer has a blue screen with a power icon and error B8493FE4. All the lights on the display are flashing . I tried switching off and unplugging but still not resolved. pls send me the resolution.

[A_Gayathri]

Hi @ck1974,

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Welcome to the HP Support Community

I understand the error code B8493FE4 on your HP OfficeJet Pro 8020 All-In-One Printer indicates a hardware issue. When all lights on the display are flashing, it typically signifies a critical error that requires attention.

Let's perform a power drain: 

• With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet.
• Remove the USB cable, if present.
• Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
• Now plug back the power cable straight to a wall outlet without any surge protector or an extension cord (This is important) and then plug back the power cord to the printer.
• Turn on the printer and wait till the warm-up period finishes and the printer is idle

Update the printer firmware 

• Click here to download and install the latest printer firmware from your product
• Click here to know different methods of updating the printer firmware.

Step 1. Launch the HP Smart app from your computer and create an account or sign into your account.

Step 2. On the Home screen of this app, select the printer or image that you want to update its firmware. If the printer is not here, you can click on Add Printer and the app will search for the printer.

Step 3. Go to the Advanced tab and select Advanced Settings or Printer Home Page (EWS).

Step 4. Select Tools or Web Services, and then click on Printer Updates or Product Update and click on Check Now. Then it will automatically download and install any available firmware updates for the printer.

Update Firmware: Ensure that your printer has the latest firmware installed. You can usually update the firmware through the printer's control panel or by visiting the HP support website and downloading the latest firmware for your printer model. Software and Drivers for HP OfficeJet Pro 8020 All-in-One Printer series

Refer to this document: HP OfficeJet Pro 8020 All-in-One Printer series

HP Officejet Pro 8000 Printers - Blinking Lights

Hope this helps! Keep me posted. 

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