Epson WF-7710 User Manual page 266

Code Condition/solution
203 The product cannot detect a dial tone.
Make sure the phone cable is connected correctly and the phone line works. If you
connected the product to a PBX (Private Branch Exchange) phone line or Terminal
Adapter, turn off the Dial Tone Detection setting.
204 The recipient's fax machine is busy. Wait a moment, then try again.
205 The recipient's fax machine does not answer. Wait a moment, then try again.
206 The phone cable is incorrectly connected to the product's LINE and EXT ports. Connect
the phone cable correctly.
207 The phone cable is not connected. Connect the phone cable.
208 The fax could not be sent to some of the specified recipients.
Print a fax log to check which recipients failed to receive the fax. You may be able to
resend a fax from the Job Status menu.
301 There is not enough storage space available on the external memory device. Clear space
on the device or use a different device.
401
302 The external memory device is write-protected; disable write protection.
402
303 No folder is available for saving the scanned file. Create a folder or use a different
memory device.
304 The external memory device has been removed. Reinsert the device.
404
305 An error occurred while saving data to the external memory device.
405
306 The product's memory is full. Wait until other ongoing jobs are finished.
315
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