ErrorCodeDoctor
HP Printer (LaserJet) Er/20 error code
The Er/20 error means your HP LaserJet printer detected a problem with the toner cartridge sensor. Removing and reinstalling the toner cartridge resets the sensor connection in most cases. If the error persists after reinstalling power cycle the printer and then replace the cartridge.
Common causes
- The toner cartridge sensor has a poor connection or temporary fault
- The toner cartridge has failed and is triggering a sensor error
How to fix it
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1
Open the cartridge access door and remove the toner cartridge
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2
Reinsert the toner cartridge firmly until it clicks into position
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3
Close the access door and try to print
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4
If Er/20 persists turn off the printer from the main power outlet wait 30 seconds and turn it back on
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5
If the error still persists replace the toner cartridge with a new genuine HP cartridge
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6
If the error continues after replacing the cartridge contact a qualified technician
Related HP Printer (LaserJet) error codes
Er/20 error — frequently asked questions
What does the Er/20 error mean on a HP printer (laserjet)?
An error was detected with the toner cartridge sensor
What causes the Er/20 error?
The Er/20 error is usually caused by: The toner cartridge sensor has a poor connection or temporary fault; The toner cartridge has failed and is triggering a sensor error.
Can I fix the Er/20 error myself?
Yes — this is rated an easy fix that most people can do themselves, typically in 5m.
How much does it cost to fix the Er/20 error?
Fixing the Er/20 error on a HP printer (laserjet) typically costs $0–$60, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my printer (laserjet) with the Er/20 error?
In most cases yes, but it's best to address the Er/20 error soon — see the fix steps below to resolve it.