Panasonic KX-FT21RS - Manual (Page 35)

3. Reception problem
Confirm the following before starting troubleshooting.
Is the recording paper installed properly?
There is the receiving problem when sometimes the below errors may be occurred.
OUT OF PAPER
CHECK COVER
Unit OVERHEATED (If it doesn´t return automatically, COVER OPEN, etc., reset the unit.)
CHECK DOCUMENT
PAPER JAM
Please refer to 2.2. User Recoverable Errors for the above items.
Also, when a hardware deformity occurs, please check each sensor.
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KX-FT21RS