Solved: Re: HP does not recognise the serial number - HP Support Community

NFUSTIER · ‎08-03-2026

Can anyone explain to me how I can request technical support when HP does not recognise the serial number of an HP LaserJet Pro 100 Colour MFP M175a printer? The serial number has been copied from a photograph of the label, but HP says it does not exist.

HP doesn’t have any support channels if the device isn’t already registered – it’s a vicious circle, because if it doesn’t recognise the serial number, it won’t let you register it, and you can’t find out what’s wrong with your device.

Repairatrooper · ‎08-03-2026

one thing to keep in mind is that HP never uses the letter "O" in a serial number only a numeric "zero". That often causes issues when people are entering serial numbers.

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Repairatrooper · ‎08-03-2026

one thing to keep in mind is that HP never uses the letter "O" in a serial number only a numeric "zero". That often causes issues when people are entering serial numbers.

If you find the information provided useful or solves your problems, help other users find the solution easier by marking my post as an accepted solution. Clicking "yes" on "was this reply helpful" also increases the chances that this solution will help others.
I am a volunteer, offering my knowledge to support fellow users, I do not work for HP nor speak for HP.

NFUSTIER · ‎08-06-2026

The serial number does not contain any 0s or O's.

HP does not recognise the serial number

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