That is the fuser exaust fan. It either is running to slow or not running at all.
The board detects a current difference and reports that fault code. Really common.
The fan part number is 127K29340.
To replace it you remove the right side cover, top cover on and the rear cover. You have to take off the shroud around the fan which is only 2 screws and replace the fan.
You can try removing the fan, cleaning it well and lubricate the bearing in the center. But that never is a permanent fix. Will work as a fix until you get a new fan.
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I'm a Xerox tech rep. If the front cover is dislodged slightly on the left bottom corner, the interlock switch tab will not actuate the switch to allow the fan circuit to energize, which in turn will give you that error code.
By the way, this advice is meant for the Xerox VersaLink B405 model. Thanks---Jim
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