Franking Machine Says Cartridge Not Recognised or Empty? What to Check
If your franking machine is showing a "cartridge not recognised", "ink empty" or "replace cartridge" message, the cause is usually simple: a poorly seated cartridge, dirty contacts, the wrong cartridge for your model, or a cartridge that has genuinely run out. This guide walks you through each check in the order most likely to fix the problem, so you can get back to franking without an unnecessary service call.
The quick answer: what to check first
Switch the machine off, remove the cartridge, look for damage or dried ink, and refit it firmly until it clicks into place. Then switch the machine back on and let it complete its start-up checks. If the error remains, confirm that the cartridge part number matches your machine and that the cartridge has not passed its shelf life. Most "not recognised" errors are resolved by one of those two steps.
Why does a franking machine reject a cartridge?
Every franking cartridge carries a small electronic chip, and your machine reads it to confirm the cartridge is the correct type and to keep track of how much ink is left. If the machine cannot read the chip cleanly, or the information does not match what it expects, it will refuse to print. That protects your mail, because Royal Mail franking relies on a clear, readable impression to process your letters correctly.
Step-by-step checks
1. Refit the cartridge properly
A cartridge that is not fully seated is the most common culprit. Power the machine down, open the ink compartment, lift the cartridge out and fit it again with a firm, even push. If you have not changed one recently, our guide on how to change the ink cartridge in your franking machine covers the process from start to finish.
2. Inspect the contacts and the print face
Look at the metal contacts on the cartridge and at the connectors inside the machine. Dust, fluff or a smear of dried ink can stop the machine reading the chip. Gently wipe away any visible debris with a dry, lint-free cloth. Avoid touching the print face itself, and never use liquids on the electronic contacts.
3. Check you have the right cartridge for your model
Many franking cartridges look almost identical, and fitting the wrong one is an easy mistake to make. Check the part number printed on your current cartridge or in your machine's manual. If you are unsure, our guide to identifying the franking ink cartridge you need shows you how to match the machine to the correct supply. You can also browse franking machine supplies by manufacturer.
4. Look at the cartridge age and storage
Franking ink does not last forever, and a cartridge stored somewhere warm, damp or in direct sunlight can dry out before you fit it. Check any date marking on the packaging. Our article on how long franking ink lasts explains sensible storage and what to expect from a sealed cartridge.
5. Check whether the cartridge really is empty
Sometimes the message is telling the truth. Ink levels are estimated from the number of impressions printed, and logos, long runs and frequent cleaning cycles can use ink faster than you expect. Our guide to how many impressions a franking ink cartridge prints helps you work out your own reorder point.
What if the print is poor rather than the machine refusing to print?
A cartridge can be accepted by the machine and still produce faint or streaky franks. That is a different problem with different fixes, so see why your franking machine may be printing faint or streaky before you replace anything.
Common mistakes that trigger the error
- Swapping cartridges between similar machines. Models from the same manufacturer can look alike but use different cartridges.
- Removing and refitting a cartridge repeatedly. Once a cartridge is marked as used or low, refitting it will not restore the ink level.
- Ignoring the message until mail is waiting. Keep a spare cartridge on the shelf so a warning never stops your outgoing post.
- Using the wrong ink colour. Check your machine requires the colour you have ordered before you fit it.
Should you replace, refill or reset?
If the cartridge is genuinely empty, you have options. New cartridges are the simplest route, and buying from a supplier you trust matters. Our comparison of original and compatible franking ink sets out the trade-offs honestly. Some cartridges can also be professionally refilled and chip reset; see our explainer on refill and reset or our refill and reset service to see whether your cartridge qualifies.
When to call your machine supplier
If a correctly matched, in-date cartridge is fitted properly, the contacts are clean and the machine still will not accept it, the fault may lie with the machine itself. At that point, contact your machine supplier or service provider, as internal print head or connector faults need an engineer.
Frequently asked questions
Why does my franking machine say the cartridge is not recognised?
The machine usually cannot read the cartridge chip, most often because the cartridge is not fully seated, the contacts are dirty, or it is the wrong cartridge for your model. Refit it firmly, clean visible debris from the contacts and check the part number.
Can I keep using a cartridge after the low ink warning appears?
Yes, usually for a limited number of impressions, but print quality can drop as the ink runs low. It is sensible to order a replacement as soon as the warning appears so you never run out mid-batch.
Will removing and refitting the cartridge reset the ink level?
No. The machine tracks usage against the chip, so refitting a used cartridge does not restore its ink. A cartridge needs to be replaced, or professionally refilled and chip reset, to show a full level again.
How do I know which cartridge my franking machine takes?
Check the part number on your existing cartridge or in the machine manual, then match it to your model. Machines from the same brand can look similar but use different cartridges, so always confirm before ordering.
Need a replacement cartridge? Browse our best selling franking ink cartridges and find the right one for your machine.