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Reception failures are almost always settings, not hardware. Check that auto-answer is on, that the receive mode matches how you use the line, and that no other device (voicemail, answering machine) is grabbing the call first. The quick test: call your own fax number from your phone and listen for the fax tones.
| What you hear when you call your fax line | Meaning | Fix |
|---|---|---|
| Fax tones after a few rings | Line and machine are working | Ask the sender to retry; the fault is likely theirs |
| A voice greeting or voicemail | Another device answers first | Shorten the fax rings-to-answer or move voicemail |
| Ringing forever | Auto-answer is off or the line is wrong | Turn on auto-answer; check the line cord |
| A person picks up | Manual receive mode on a shared line | Switch modes or keep the line fax-only |
Fax machines offer several receive modes, and the wrong one silently eats incoming faxes. Fax-only mode answers every call as a fax, which is correct for a dedicated line. Telephone mode never answers automatically and waits for you to press a button, correct for a line where you answer by hand. Fax/telephone auto-switch listens to the incoming tones and decides, which suits shared lines. If your machine used to receive fine and suddenly stopped, check the mode first: power outages and accidental button presses reset machines to telephone mode more often than anyone expects.
This is the most common cause on shared lines. A voicemail service, an answering machine, or a phone with an answering feature can pick up on ring two while the fax machine is set to answer on ring four, and the fax never gets its chance. The fix is a race you can win: set the fax machine to answer on fewer rings than the competing device. A subtle variant is distinctive ring, where the phone company rings differently for a second number; the fax machine must be told which ring pattern is its own, or it will ignore calls meant for it. If you recently changed phone plans or added voicemail, that change is your prime suspect.
Yes, and it surprises people. Many machines will not answer incoming calls when they are out of paper, out of toner, or when their memory is full of stored jobs. The logic is defensive: accepting a fax it cannot print would lose the document. Load paper, replace the toner or ink, and clear stored faxes and delayed-send jobs from memory. While you are at it, check for a paper jam you cannot see from the outside; some machines flag a hidden jam by refusing to receive rather than by displaying an error. A machine that sends fine but will not receive is behaving exactly like a machine with a supplies problem, because sending and receiving draw on different resources.
Partial failure points at compatibility, not at your setup. Older machines and some online fax services negotiate speed and error correction in ways that do not always agree; the sender dropping to a slower transmission speed often clears it. International faxes are the classic case. Also ask the sender what error their machine reports: "no answer" on their end while your machine is healthy can mean their line, not yours. Print your machine's activity or transmission report log and compare timestamps with the sender's failed attempts to confirm the call even reached you.
If the self-call test fails too, unplug everything and work backwards. Plug a plain telephone into the wall jack and check for a dial tone: no dial tone means the line is dead, and no fax setting will fix that. If the jack is live, reconnect the fax machine with a known-good cord, bypassing any splitters or surge protectors. VoIP adapters deserve special suspicion for reception problems, because they can handle outgoing calls while mangling the incoming handshake tones. If the line is a digital voice line from a cable or fiber provider, ask the provider whether fax is supported on it at all.
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