The Ricoh error code 548 / SC548 is a fusing unit error code.
If you are getting this error:
Check the fuser unit to see if it is set properly. There are some connections on the fuser unit not making good contact.
Reset the fuser and power the machine off and on.
To reset this error try the code:
"Clear Mode"+107+"Clear/Stop" hold for 5s.
Turn ON and OFF the Main Switch.
If the problem persists you may need to contact a local service technician to take a look at your copier.
Contact us by phone, email, or reply to this post with any questions you may have, we can always help.