Are you using a dedicated fax line or a shared line?
Let us try these steps to resolve this issue:
Reset the printer
With the printer turned on, disconnect the power cord from the rear of the printer.
Wait at least 60 seconds.
Reconnect the power cord to the rear of the printer.
Turn ON the printer, if it does not automatically turn on.
Wait until the printer is idle and silent before you proceed.
Note: HP recommends connecting the printer directly to a wall outlet rather than a surge protector or a power strip.
You are right, there is no option to run the fax test on this model printer.
On the printer, go to Setup > Fax setup > ECM mode > Off
Receiving mode > Ans/Fax
Make sure rings to answer is set appropriately. Set it to 6.
Now, send a one-page black and white text fax to 1-888-HPFaxme (1-888-473-2963). When the service receives your fax, a return confirmation fax is sent within five minutes. This verifies that you can both send and receive a fax.
Hope this helps! Keep me posted.
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