Why cant I send a fax

Noise in the phone line, or low signal strength during fax transmission can result in fax failures. Noise or poor signal strength can cause a partial or complete loss of fax information during transmission. When Error Correction Mode (ECM) is on, the receiving fax machine checks the fax information for errors during reception. If the receiving fax machine detects an error, the receiving fax requests that the sending fax resend the information. Resending all or part of the information can make transmission times longer, but helps improve the quality of the received fax.
If the phone line quality or signal strength is extremely poor, sending a fax can fail. Turning off ECM can improve the ability of the product to send a fax successfully when the phone line quality is poor. However, the image quality of the received fax might be poor.
If ECM must be off to send faxes successfully, have the telephone service provider check the phone line quality. For an HP Fax, turning off ECM from the control panel does not necessarily mean that fax transmission will not use ECM. Fax products use ECM as follows.

• All faxes sent in color use ECM.
• All faxes sent at the highest transmission speed use ECM.
• The ECM setting affects only sent faxes, not received faxes.

Enabling or disabling Error correction mode (ECM)

1. On the product control panel, press the Menu button ( ).
2. Use the arrow buttons ( ) to select Basic Fax , and then press the OK button ( ).
3. Use the arrow buttons ( ) to select ECM Mode , and then press the OK button ( ).
4. Use the arrow buttons ( ) to select On or Off , and then press the OK button ( ) to confirm the setting.
5. Press the Back button ( ) twice to return to the main screen.

if you have a digitized phone line you can do nothing about these problems. faxing will eventually die out anyway.

check the fax line. Plug that line into the regular fax machine to see if you can receive/send from there. What where you should start. Thanks

Your fax machine thinks everything is OK. If you can receive you can send.

call the failing fax number with a regular phone and listen for fax tones.

Noisy line? is all that strikes true when you ensure me it makes great photocopys, but then you receive OK, very strange, All the mechanisms for doing a local copy is the same as sending a fax the difference is the conversion to phone noise so it has to be electronic, I;d guess lightning/power surge, cant think of much else....sorry

Use the HP Fax Test
The telephone number for this service is 1-888-HPFaxme (1-888-473-2963). The fax service receives faxes and returns faxes within 5 to 7 minutes to the number contained in the fax header. Solution two: Run a fax diagnostic test

1. Load plain white paper into the input tray.
2. Press the Setup button ( ) on the product control panel.
3. Press the right arrow ( ) to select Tools , and then press OK .
4. On the Tools menu, press the right arrow ( ) to select Run Fax Test , and then press OK . The fax diagnostic test prints.

Solution three: Check the telephone line and change the HP fax settings Step one: Test the telephone line

1. Disconnect the telephone cord from the back of the HP fax product.
2. Figure 1: Two-wire telephone cord
3. Pick up the handset of the telephone and check for a dial tone.
   
4. On the single-line telephone, dial the fax number of the receiving fax machine.
   • If the receiving fax machine answers the call, continue with the next step.
5. Hang up the single-line telephone.
6. Use a second telephone line or a cellular telephone to call the telephone number assigned to the HP fax product.

Step two: Change the HP fax settings

1. Connect phone line into line 1
2. Press the Setup button ( ) on the product control panel.
3. Press the right arrow ( ) to select Basic Fax Setup or Advanced Fax Setup , and then press the right arrow ( ) again to change the menu option settings to the settings listed in the following table. Fax menu Fax menu option Setting Basic Fax Setup Rings to Answer 1 or 2 (At least one more ring than a telephone answering machine, if an answering machine is connected.) Advanced Fax Setup Answer Ring Pattern All Rings
4. Use the HP Fax Test Service to try to send and receive a fax.

If the HP fax product still cannot send or receive a fax, continue to the next solution. Solution four: Check VoIP digital telephone line Using a VoIP telephone service can cause faxing to fail because fax transmissions are sensitive to the timing of the signals used to transmit the fax. If using a VoIP digital line is necessary, changing the Fax Speed Adjustment setting to Medium might improve the ability to send a fax over a VoIP telephone line. Use these steps to change the fax speed adjustment to a lower speed.

1. Press the Setup button ( ) on the product control panel.
2. Press the right arrow ( ) to select Advanced Fax Setup , and then press OK .
3. Press the right arrow ( ) to select Fax Speed , and then press OK .
4. Press the right arrow ( ) to select Medium , and then press OK .
5. Use the HP Fax Test Service to try to send and receive a fax

Use the HP Fax Test
The telephone number for this service is 1-888-HPFaxme (1-888-473-2963). The fax service receives faxes and returns faxes within 5 to 7 minutes to the number contained in the fax header. Solution two: Run a fax diagnostic test

1. Load plain white paper into the input tray.
2. Press the Setup button ( ) on the product control panel.
3. Press the right arrow ( ) to select Tools , and then press OK .
4. On the Tools menu, press the right arrow ( ) to select Run Fax Test , and then press OK . The fax diagnostic test prints.

Solution three: Check the telephone line and change the HP fax settings Step one: Test the telephone line

1. Disconnect the telephone cord from the back of the HP fax product.
2. Figure 1: Two-wire telephone cord
3. Pick up the handset of the telephone and check for a dial tone.
   
4. On the single-line telephone, dial the fax number of the receiving fax machine.
   • If the receiving fax machine answers the call, continue with the next step.
5. Hang up the single-line telephone.
6. Use a second telephone line or a cellular telephone to call the telephone number assigned to the HP fax product.

Step two: Change the HP fax settings

1. Connect phone line into line 1
2. Press the Setup button ( ) on the product control panel.
3. Press the right arrow ( ) to select Basic Fax Setup or Advanced Fax Setup , and then press the right arrow ( ) again to change the menu option settings to the settings listed in the following table. Fax menu Fax menu option Setting Basic Fax Setup Rings to Answer 1 or 2 (At least one more ring than a telephone answering machine, if an answering machine is connected.) Advanced Fax Setup Answer Ring Pattern All Rings
4. Use the HP Fax Test Service to try to send and receive a fax.

If the HP fax product still cannot send or receive a fax, continue to the next solution. Solution four: Check VoIP digital telephone line Using a VoIP telephone service can cause faxing to fail because fax transmissions are sensitive to the timing of the signals used to transmit the fax. If using a VoIP digital line is necessary, changing the Fax Speed Adjustment setting to Medium might improve the ability to send a fax over a VoIP telephone line. Use these steps to change the fax speed adjustment to a lower speed.

1. Press the Setup button ( ) on the product control panel.
2. Press the right arrow ( ) to select Advanced Fax Setup , and then press OK .
3. Press the right arrow ( ) to select Fax Speed , and then press OK .
4. Press the right arrow ( ) to select Medium , and then press OK .
5. Use the HP Fax Test Service to try to send and receive a fax.

Check your fax speed settings, also, make sure you get a good clear dial tone on the line. Sometimes it wont send if it detects line noise.

Is your phone line DIGITAL? Fax machines are ANALOG devices.

Ok - phone off hook is a message on the printer because you are on the phone. There is a phone that is up somewhere in your home that it can recognize. You cannot send a fax or receive and be on the phone at the same time. This can also be caused by credit card machines, internet service (filter needs to be on fax line), and other fax machines.

To the original poster - your question is fairly vague. This hp link solves the most common issues when you can send but not receive.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01503742&lc=en&dlc=en&cc=us&lang=en&rule=21569&product=391182