Question about Office Equipment & Supplies
Major causes of a U4 error include the following:
? Warm-up failure - Fuser warm-up not complete within 110 seconds after
? Cool-down error - Cool-down process not complete within 200 seconds.
? Low trouble temperature - The fuser temperature drops to the low trouble
temperature (approximately current control temperature, minus
approximately 25° C).
? High trouble temperature - The fuser temperature rises to the high trouble
temperature (approximately current control temperature, plus
approximately 35° C).
? STS circuit open
? STS failure - The heat rod remains on for at least 10 seconds after warmup
You have to replace the thermistor in the fuser unit.
Posted on Oct 13, 2010
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Posted on Jan 02, 2017
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