HP LaserJet M109-M112, M109a-M112a series lights: what each pattern means
9 light patterns of the HP LaserJet M109-M112, M109a-M112a series, from HP’s own guide HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36). Small mono laser printer, no display: Attention and Ready lights, plus a Wireless light on wireless models such as the M110w.
The lights on this printer
- Wireless light (wireless models only) — blue
- 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
Ready light (in the Power button) on; Attention light off. Colour not stated by HP.
The printer is ready to print.
HP’s page gives no step for this.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (HP), checked 2026-09-29.
Ready light blinking
Ready light (in the Power button) blinking; Attention light off. Colour not stated by HP.
The printer is receiving print data and processing the job.
What HP says to do
- To cancel the job, press the Resume/Cancel button while the Attention light is off and the Ready light is blinking.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (HP), checked 2026-09-29.
Ready light dimmed
Ready light (in the Power button) dimmed. Colour not stated by HP.
The printer is in a low-power state (Sleep mode).
What HP says to do
- Press the Resume/Cancel button to wake it.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (HP), checked 2026-09-29.
Attention light blinking, Ready light on
Attention light blinking; Ready light (in the Power button) on. Colour not stated by HP.
HP gives 12 causes for this pattern; the message on the computer or the printer software tells them apart.
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 Resume/Cancel to continue.
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 Resume/Cancel.
The input tray is empty.
What HP says to do
- Load the tray and press Resume/Cancel. Wireless models have a paper sensor and carry on by themselves once paper is loaded.
A door is open.
What HP says to do
- Make sure the toner-cartridge door is fully closed.
The printer failed to pick up a sheet of paper for the job.
What HP says to do
- Check that the paper is loaded correctly, then press Resume/Cancel.
Paper is jammed in the printer.
What HP says to do
- Check the input tray, the output bin and the toner cartridge area, clear the jam, then press Resume/Cancel.
The toner cartridge is missing or incorrectly installed.
What HP says to do
- Check that the cartridge is in place and installed correctly.
The toner cartridge is very low. (If the printer is set to keep printing when the cartridge is very low, there is no Attention state.)
What HP says to do
- Replace the toner cartridge.
The toner cartridge is incompatible with the printer, perhaps because its memory chip is missing or damaged; or it has been protected on another printer; or it is an unauthorized cartridge.
What HP says to do
- Replace the toner cartridge.
The loaded paper is not the size the print job needs.
What HP says to do
- Replace the paper, or press Resume/Cancel to carry on with the size loaded.
The printer has had a general engine error.
What HP says to do
- Press Resume/Cancel to continue.
- If the error repeats, turn the printer off, wait 30 seconds, and turn it on.
Incorrect firmware has been loaded.
What HP says to do
- Press Resume/Cancel to continue, then load the correct firmware.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (HP), checked 2026-09-29.
Attention and Ready lights on
Attention light on; Ready light (in the Power button) on. Colour not stated by HP.
The printer has had a fatal error it cannot recover from.
What HP says to do
- Turn the printer off or unplug its power cord.
- Wait 30 seconds, then turn it on or plug it back in, and wait for it to initialize.
- If the error persists, contact HP customer support.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (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. No action is needed.
HP’s page gives no step for this.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (HP), checked 2026-09-29.
Wireless light on
Wireless light (wireless models only) (blue) on.
There is a stable wireless connection.
HP’s page gives no step for this.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (HP), checked 2026-09-29.
Wireless light blinking
Wireless light (wireless models only) (blue) blinking.
There is no wireless connection at the moment, or a WPS or Wi-Fi Direct setup is in progress.
HP’s page gives no step for this.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (HP), checked 2026-09-29.
Wireless light blinking rapidly
Wireless light (wireless models only) (blue) blinking fast.
There is a problem with the wireless connection.
HP’s page gives no step for this.
Source: HP LaserJet M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) (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 M109-M112, M109a-M112a series User Guide — Control panel features (pages 2 and 3) and Interpret control-panel light patterns (pages 35 and 36) — HP LaserJet M109-M112, M109a-M112a series. h10032.www1.hp.com Checked 2026-09-29.
Find a pattern by which light and how it blinks, on any brand →