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Open right side door and check for a jam in the fusing unit (the one that is normally hot). Remove jam carefully. Hit P * C * and enter 14. Push the start button like you are making a copy. Machine should reboot and code should not return. if it does, you may have a dirty themistor, or blown lamp.
OK, CH normally means the one of the covers(front or side panels) is open or the developer unit is unplugged try these to see if that fixes the problem.
When the covers are closed a small tab on the covers triger a interlock switch or optical switch.
Hope this helps