HP LaserJet Pro MFP M521 series - The Fax is busy message appears

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The Fax is busy message appears

Try sending the fax again.

Call the recipient to ensure that the fax machine is on and ready.

Check that you are dialing the correct fax number.


Chapter 9 Solve problems


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Check for a dial tone on the phone line by using the

Start Fax


Make sure that the phone line is working by disconnecting the product, connecting a telephone to

the phone line, and making a voice call.

Connect the product phone cord to a jack for another phone line, and try sending the fax again.

Try a different phone cord.

Send the fax at a later time.

If the error persists, contact HP. See


or the support flyer

that came in the product box.