Xerox Phaser 840 Service Manual page 130

13,033.45 error: the thermistor in the reservoir appears to be open. If the 4-pin
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connector on the top of the driver board is disconnected, this error will occur.
Turn off the printer and reseat the cable.
Fig 3-7 Inadvertently disconnected thermistor cable connector
13,034.46 error: thermistor appears to be shorted. Look to see if the 4-pin plug
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on the top of the driver board is plugged in correctly. If it is, check the gray data
cable. If the gray data cable is good, replace printhead. If the error happens on
the new printhead, replace the power control board.
13,035.47 and 13,036.48 errors: reservoir heater is running away, or reservoir is
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not heating. With these errors it is most likely a problem with the printhead.
A broken ink loader can cause the cap/wipe/purge assembly
Note
gasket to not seal. Look for signs of breakage of the black plastic
parts on the ink loader's underside, especially the bosses that
retain the lowest black plastic panel. Breakage or separation can
interfere with head tilt, resulting in a poor seal with the
cap/wipe/purge assembly during the purge process. Replace the
ink loader if broken or defective.
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Phaser 840/850/860/8200 Color Printer - Service Manual