HP 305 troubleshooting: not recognised, error codes, replacing a cartridge

• 01Cartridge not recognisedCheck code, tape, seating and chip
• 02Error message or E0Find out what it means before replacing
• 03Fitting a new cartridgeReplace safely and align
• 04Look up printer and codeWhich models use HP 305
• 05Empty cartridge left overFree returns to HP
• 06Alternative doesn't workChip, firmware and returns

Cartridge problems: check in this order

1. Identify: full printer model, cartridge code and the position named.
2. Inspect: tape, damage and correct seating, without forcing anything.
3. Isolate: test only the position named; don't automatically replace both cartridges.
4. Escalate: if several correct cartridges fail, the printer or carriage may need support.

Cartridge not recognised

"Not recognised" can appear as an incompatible, missing or faulty cartridge or as a communication problem. Note the text and which position it names, so you don't investigate the colour cartridge when only black has a fault.

1. Check the printer model and confirm HP 305/305XL is listed (printer list).
2. Check the OEM code: black 3YM61AE or 3YM62AE; colour 3YM60AE or 3YM63AE.
3. Leave the printer on, open the cartridge door and wait until the carriage stops.
4. Remove and inspect: is all the protective tape off, is there visible damage?
5. Reseat in the correct slot until it clicks and close the door.
6. Restart once if the message stays.

HP names a poor electrical connection as a possible cause. Only clean contacts following the instructions for your cartridge and printer, don't touch the nozzles and let any moisture dry completely.

If a known-good 305 cartridge is recognised in the same position, the new cartridge is the likelier cause. If several correct cartridges aren't recognised in one position, the printer needs help. For alternatives: on the product pages of the DeskJet 2820e and 4220e, among others, HP describes dynamic security, under which a chip can be treated differently after an update. Don't install unknown firmware or an unofficial downgrade; ask the seller for a supported replacement.

Understanding error messages

The wording differs between printer series. Use the message as the starting point for one targeted check, not as proof that something is broken.

A "low ink" message isn't a compatibility error; HP describes ink levels as an estimate. Only remove a cartridge once the new one is ready.

On ENVY 6000/6400 models HP links the E0 code to an unusable or problematic cartridge. DeskJet series use ink icons and number codes; other codes point to paper or a jammed carriage instead. Look up the code for your exact model before buying new ink.

Online "reset" instructions often concern a different model or unofficial firmware. A normal restart, correct seating and HP's official diagnosis are safer. If several correct cartridges fail in the same position, contact HP Support.

Replacing a cartridge in 8 steps

The door and click direction vary per printer; check your manual too. The order below follows HP's instructions for this cartridge type.

1. Switch the printer on and wait until it's quiet.
2. Open the cartridge access door.
3. Wait until the carriage stops moving.
4. Release the old cartridge according to your printer's latch.
5. Unpack the new cartridge and remove only the marked protective tape.
6. Hold the cartridge by its plastic sides; don't touch the contacts or nozzles.
7. Push black or tri-colour into the marked slot until it clicks.
8. Close the door and follow the alignment prompts on the display or in the HP app.

Standard black is 3YM61AE, standard tri-colour 3YM60AE; XL black 3YM62AE and XL colour 3YM63AE. You can mix standard and XL. The old cartridge doesn't belong in general waste — see cartridge recycling.

Not every fault is about ink

Paper-size codes, paper jams, an offline status or an expired Wi-Fi setup need printer or network steps. For Wi-Fi: put the printer and your device on the same network, restart once and re-add the printer in the HP app if needed.

When to stop

Stop if there's leaking ink, visible damage, a burning smell, a cartridge that only fits with force, or repeated errors with several correct cartridges. Keep the error text and your receipt and contact HP or the retailer.