HP LaserJet MFP M139-M142 series lights: what each pattern means
30 light patterns of the HP LaserJet MFP M139-M142 series, from HP’s own guide HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41). Small mono laser multifunction (for example the M140w) with Attention, Ready, Supplies and Wireless lights and a two-character display that alternates Go or Er with a two-digit code.
The lights on this printer
- Wireless light (wireless models) — blue
- Supplies light
- Display (alternates Go or Er with a two-digit code)
- Attention light
- Ready light (in the Power button)
Our own schematic drawing, not HP’s panel layout: the lights are in the order HP’s guide lists them. Where HP does not give a light’s colour, it is drawn filled in the text colour.
Ready light on, Attention light off
Ready light (in the Power button) on; Attention light off. Colour not stated by HP.
The printer is in Ready mode. The display shows the number of copies currently set.
HP’s page gives no step for this.
- The Supplies light may or may not be on as well, depending on the toner level.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Ready light on but dim
Ready light (in the Power button) dimmed; Attention light off. Colour not stated by HP.
The printer is in Sleep mode.
HP’s page gives no step for this.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Ready light blinking, Attention light off
Ready light (in the Power button) blinking; Attention light off. Colour not stated by HP.
The printer is processing a job. For print and scan jobs the display shows the copies setting; for copy jobs, the copy being made; for ID Copy, P1 while the front of the card is scanned and P2 for the back.
HP’s page gives no step for this.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Attention and Ready lights blinking
Attention light blinking; Ready light (in the Power button) blinking. Colour not stated by HP.
The printer is initializing, cleaning, or cooling down.
HP’s page gives no step for this.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Supplies light on
Supplies light on. Colour not stated by HP.
The toner cartridge is very low and needs replacing.
HP’s page gives no step for this.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Go 01 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Go 01”. Colour not stated by HP.
Display code Go/01
The printer is in manual-feed mode.
What HP says to do
- Load the correct paper type and size into the input tray, then press Start Copy/Resume.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Go 02 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Go 02”. Colour not stated by HP.
Display code Go/02
The printer is processing a manual duplex job.
What HP says to do
- Load the pages into the input tray to print their second sides, then press Start Copy/Resume.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Go 03 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Go 03”. Colour not stated by HP.
Display code Go/03
The paper type or size of the print job differs from the tray settings.
What HP says to do
- Load the correct paper type and size, or press Start Copy/Resume to carry on with the paper loaded.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Go 06 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Go 06”. Colour not stated by HP.
Display code Go/06
A device has asked to connect to the printer with Wi-Fi Direct.
What HP says to do
- Press Start Copy/Resume to connect.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
P2 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “P2”. Colour not stated by HP.
Display code P2
An ID Copy job has started and is waiting for the back of the card.
What HP says to do
- Turn the card over and press the ID Copy button to continue.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 01 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 01”. Colour not stated by HP.
Display code Er/01
The input tray is empty.
What HP says to do
- Load the tray.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 02 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 02”. Colour not stated by HP.
Display code Er/02
A door is open.
What HP says to do
- Make sure the top cover is fully closed.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 03 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 03”. Colour not stated by HP.
Display code Er/03
The printer failed to pick up a sheet of paper.
What HP says to do
- Press Start Copy/Resume to continue.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 04 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 04”. Colour not stated by HP.
Display code Er/04
Paper is jammed in the input tray.
What HP says to do
- Clear the jam from the input tray.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 05 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 05”. Colour not stated by HP.
Display code Er/05
Paper is jammed in the toner cartridge area.
What HP says to do
- Clear the jam from inside the printer.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 06 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 06”. Colour not stated by HP.
Display code Er/06
Paper is jammed in the output bin area.
What HP says to do
- Clear the jam from the output area.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 25 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 25”. Colour not stated by HP.
Display code Er/25
The loaded paper is not the size the print job needs.
What HP says to do
- Replace the paper, or press Start Copy/Resume to carry on with the size loaded.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 26 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 26”. Colour not stated by HP.
Display code Er/26
The printer has had a general engine error.
What HP says to do
- Press Start Copy/Resume to continue.
- If the error repeats, turn the printer off, wait 30 seconds, and turn it on.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 81 with the Attention light blinking
Attention light blinking; Display (alternates Go or Er with a two-digit code) on; display shows “Er 81”. Colour not stated by HP.
Display code Er/81
Incorrect firmware has been loaded.
What HP says to do
- Press Start Copy/Resume to continue, then load the correct firmware.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 08 with the Attention light blinking, Ready light on
Attention light blinking; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 08”. Colour not stated by HP.
Display code Er/08
The toner cartridge has reached very low and the printer is set to stop printing at that point.
What HP says to do
- Replace the cartridge, or change its Very Low setting to Continue in the Embedded Web Server. Set to Continue, the Supplies light stays on and no code is shown.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 07 with Attention and Supplies lights blinking
Attention light blinking; Supplies light blinking; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 07”. Colour not stated by HP.
Display code Er/07
The toner cartridge is missing or incorrectly installed.
What HP says to do
- Install or reinstall the cartridge.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 11 with Attention and Supplies lights blinking
Attention light blinking; Supplies light blinking; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 11”. Colour not stated by HP.
Display code Er/11
There is a problem with the toner cartridge.
What HP says to do
- Make sure the shipping material has been removed from the cartridge and that it is compatible and not damaged.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 14 with Attention and Supplies lights blinking
Attention light blinking; Supplies light blinking; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 14”. Colour not stated by HP.
Display code Er/14
The toner cartridge has been protected and is not allowed in this printer.
What HP says to do
- Replace the cartridge.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 17 with Attention and Supplies lights blinking
Attention light blinking; Supplies light blinking; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 17”. Colour not stated by HP.
Display code Er/17
An unauthorized toner cartridge is installed. The printer works only with Original HP cartridges.
What HP says to do
- Replace the cartridge.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 30 with Attention and Ready lights on
Attention light on; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 30”. Colour not stated by HP.
Display code Er/30
There is a problem with the flatbed scanner.
What HP says to do
- Turn the printer off or unplug the power cord.
- Wait 30 seconds, turn it on again, and wait for it to initialize.
- If the error persists, contact HP customer support.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 50, 51, 52, 54, 55, 58 or 59 with Attention and Ready lights on
Attention light on; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 5_”. Colour not stated by HP.
Display code Er/50, Er/51, Er/52, Er/54, Er/55, Er/58, Er/59
There is a problem with the print engine.
What HP says to do
- Turn the printer off, wait 30 seconds, and turn it on.
- If the error persists, contact HP customer support.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 66 with Attention and Ready lights on
Attention light on; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 66”. Colour not stated by HP.
Display code Er/66
There is a problem with the wireless hardware.
What HP says to do
- Press Start Copy/Resume to continue without the wireless hardware.
- If the error repeats, turn the printer off, wait 30 seconds, and turn it on.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 74, 76 or 77 with Attention and Ready lights on
Attention light on; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 7_”. Colour not stated by HP.
Display code Er/74, Er/76, Er/77
The printer has had a fatal error it cannot recover from.
What HP says to do
- Turn the printer off, wait 30 seconds, and turn it on.
- If the error persists, contact HP customer support.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 75 with Attention and Ready lights on
Attention light on; Ready light (in the Power button) on; Display (alternates Go or Er with a two-digit code) on; display shows “Er 75”. Colour not stated by HP.
Display code Er/75
The printer is not connected to the Internet to validate its supply.
What HP says to do
- Reconnect the printer to the Internet so it can validate the cartridge.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Er 61 with the Wireless light blinking fast
Wireless light (wireless models) (blue) blinking fast; Display (alternates Go or Er with a two-digit code) on; display shows “Er 61”.
Display code Er/61
A wireless WPS connection failed.
What HP says to do
- Press Cancel, then try connecting the printer to the wireless network again.
- If the problem persists, connect using the HP Smart app.
- HP counts this fast blink as 4 blinks every 3 seconds; an ordinary blink on this printer is 2 blinks every 3 seconds.
Source: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) (HP), checked 2026-09-29.
Other HP printers
The same light can mean something else on another HP family, so check the model name on your printer.
Sources
HP’s own pages only, read on the date shown. Nothing here comes from third-party “printer codes” sites.
- HP: HP LaserJet MFP M139-M142 series User Guide — Control panel buttons and lights (pages 3 and 4) and Interpret control-panel light patterns and display codes (pages 38 to 41) — HP LaserJet MFP M139-M142 series. h10032.www1.hp.com Checked 2026-09-29.
Find a pattern by which light and how it blinks, on any brand →