Panasonic KX-FLB803CN fax machine cannot receive faxes, but it can send faxes for the following reasons:

1. The consumables of the fax machine are used up. Check whether the fax machine runs out of toner or paper.

2. If the fax machine itself has quality problems, contact the after-sales detection module board.

3. The telephone line of the fax machine is connected incorrectly. The correct connection is as follows: