Brother 'Unable to Print 35': print head fault troubleshooting

What causes it

• The print head overheating after a long or repeated cleaning cycle
• Ink that has leaked onto the head's electrical contacts
• A flat ribbon cable to the carriage that has worked loose or chafed
• Air in the ink lines after running a cartridge completely dry
• Genuine electrical failure of the print head

How to fix it, in order

Work down the list and stop when the printer recovers. The steps are ordered from most likely and least invasive to last resort.

1. Power off and let the machine rest

   Hold the power button until the display clears, then unplug the machine at the wall. Leave it for at least thirty minutes, and longer if the error appeared after a series of head cleans. If the head simply got hot, a genuine cool-down period is what clears the code, and rushing this step is why people conclude the machine is dead when it is not.

2. Check the room temperature and ventilation

   Brother inkjets expect an ambient temperature roughly between 10 and 35 degrees Celsius. A machine in a conservatory in summer or squeezed into a cupboard with no airflow will trip head temperature limits. Move it somewhere cooler with clear space at the back and sides before testing again.

3. Inspect the cartridges and the carriage for leaks

   Open the ink cartridge cover and remove each cartridge. Look for ink pooled in the cartridge bay or wet contacts. Blot any ink with kitchen towel, wipe the contacts inside the machine with a dry lint-free cloth, and let the area dry fully before refitting. Leaking third-party cartridges are a frequent cause.

4. Refit genuine Brother cartridges

   Fit a full set of genuine LC-series cartridges for testing if there is any doubt about the current ones. Push each one in until the lever clicks. Compatible cartridges that do not vent correctly starve the head and can make it run hot, which is exactly the condition this code reports.

5. Check the carriage ribbon cable

   With the machine unplugged and the scanner cover raised, look at the flat cable that runs to the carriage. It should be seated in its clip and free of creases or shiny wear marks. Press the connector home gently if it looks proud, and avoid pulling on the cable itself.

6. Restart and run one purge, not several

   Reconnect and power on. If the machine boots, run a single head cleaning from Menu, then Ink, then Cleaning, choosing Black or Colour as appropriate. Follow with a Print Quality Check page. Do not run repeated cleans, because that reheats the head and refills the ink absorber.

7. Note whether the error is instant or delayed

   If the code appears the moment the machine powers on, the head or its wiring has failed. If it only appears after a few pages or after a clean, the fault is thermal and better cooling plus fewer cleaning cycles may keep the machine usable for a while longer.

Frequently asked questions