Precor Experience 600 Series Service Manual page 203

If YES, overloading is the most frequent cause of making the treadmill shut
o
down. Overloading most often occurs when heavy exercisers are running on a
worn belt. The deck/belt friction issue is also worsened by poor input line
voltage. Overloading is often accompanied by error codes 27, 28, or 29. Verify
the running belt condition.
See Also
"System Troubleshooting Procedures" on page 189
Contact Precor Customer Support at support@precor.com or 800.786.8404 with
any questions.
7 Troubleshooting
System Troubleshooting Procedures
Page 193