A printer that switches itself off may be perfectly healthy and simply following an energy-saving setting, or it may be reacting to a power or heat problem. The timing tells you which. Shutting down after a quiet spell points to an auto-off timer or schedule, while cutting out mid-job, or when another appliance starts, points to the power feeding it or to overheating. This guide helps you read that pattern, then works through settings, power, ventilation and firmware in turn.
What you might be seeing
- The printer is off when you come back to it
- It shuts down part-way through a job
- It cuts out when a heater, microwave or air conditioner starts
- It turns off at the same time each day
Common causes
- Auto-off timer
- Many printers turn fully off after a period of inactivity, sometimes only when no USB or network connection is active.
- Power schedule
- A schedule set on the printer or in the manufacturer's app can switch it off at a fixed time.
- Unstable power
- A loose cord, an overloaded strip or a voltage dip when other appliances start can cut it out.
- Overheating
- Blocked vents or a hot location can trigger thermal protection during long jobs.
- Firmware or internal fault
- A firmware bug or a failing power supply can cause random shutdowns.
How to fix it, step by step
Work through these in order and test a print after each one. Most people are done within the first few steps.
Unplug the printer and stop using it if it shuts off with smoke, sparking, a burning smell or unusual heat from the cord or adapter.
Note when it happens
For a few days, jot down when the printer turns off: after sitting idle, at a set time, during printing, or as another device starts. Check too whether it's really off or only asleep; a sleeping printer usually shows a dim or pulsing light and wakes with a button press or an incoming job. The pattern tells you which of the following steps matters most.
Review auto-off and schedule settings
On the printer's control panel, open the setup, settings or energy menu and look for options with names like Auto Off, Auto Power Off or Schedule On/Off; exact names vary. Lengthen or disable auto-off and delete any schedule you didn't set deliberately. The same options often appear in the manufacturer's app or the printer's built-in web page. Leave sleep mode on, since it saves energy without switching the printer off.
Give the cord some slack
Check that the power cord is pushed fully into the printer and the outlet, with no tension on it. A cord stretched across a walkway or bent sharply where it enters the printer can lose its connection as the printer vibrates during a job. Re-route it with some slack. If there's an external adapter, make sure it isn't buried under papers or noticeably hot.
Separate it from high-draw appliances
Plug the printer into a wall outlet or a good surge protector rather than a chain of strips or extension cords. Keep it off any strip or circuit shared with space heaters, kettles, microwaves or air conditioners, whose start-up can briefly dip the voltage. Laser printers pull a burst of power while warming up, which makes them especially sensitive to crowded strips.
Improve airflow around the printer
Clear anything blocking the vents on the sides and back, such as walls, stacked paper or a tight shelf, and leave several inches of space around them. Keep the printer out of direct sun and away from heaters. With it switched off and unplugged, brush dust from the vent grilles with a soft, dry brush. If shutdowns happen during long jobs, print in smaller batches.
Update the firmware on a reliable outlet
If shutdowns follow no pattern of time, power or heat, check for a firmware update using the printer's own update option, the manufacturer's app or the manufacturer's official website. Because an update must not be interrupted, first move the printer to an outlet you've already tested, and keep it connected and powered until the update finishes and the printer restarts.
Stop if the power supply seems to be failing
If the printer dies with a click, buzz or burning smell, or the power light flickers before it goes out, the internal power supply may be failing. Unplug it and stop using it. Leave the casing closed and don't try to fix the power section yourself; that work belongs to qualified service. Check the warranty and the manufacturer's repair options.
How to keep it from happening again
- Set auto-off and schedules deliberately and note your choices
- Keep the printer off strips shared with heaters and kitchen appliances
- Leave space around the vents and dust them occasionally
- Plug into a surge protector, not a plain strip
Common questions
Is it harmful when the printer turns itself off?
Not when a timer does it, because the printer shuts down properly and parks its parts. Sudden power loss is different: an inkjet may not cap its printhead, which can let it dry out, and a laser may leave a sheet in the paper path. Cutting out mid-job is worth fixing promptly.
Why does auto-off only happen on some days?
Many printers only switch fully off when no USB or network connection is active. Yours may stay on while a computer is connected and turn off once the computer sleeps or the Wi-Fi drops. The auto-off description in the printer's settings or user guide explains the exact rule.
Will a battery backup stop the shutdowns?
A small inkjet can run on a suitably sized uninterruptible power supply, but laser printers draw too much on warm-up for most battery backup units and can overload them. Use a surge protector for a laser printer, and check the manufacturer's guidance before connecting any printer to battery backup.
This guide is general information written for common home and office printers. Menus and button names vary between models, so check your printer’s manual where a step differs. Printer Problems Solved is independent and not affiliated with any printer manufacturer. See our disclaimer.