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U4 fuser error for Xerox 4500 phaser. - Office Equipment & Supplies

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Major causes of a U4 error include the following:

? Warm-up failure - Fuser warm-up not complete within 110 seconds after
starting.
? 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
has completed.

You have to replace the thermistor in the fuser unit.

Posted on Oct 13, 2010

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1 Answer

Received fuser error u4-1. Replaced fuser, and still get same error


Try to hard reset your printer. To do this, unplug the cord at the rear of the printer while still powered on. Then remove it the plug from the socket. Let it sit for a few minutes. Then, plug the power cord and then reattach the cord at the back. The printer should power on itself, if not just power it on manually by pressing the power button.

Doing the hard reset should clear off any error messages from your printer's memory.

Feb 06, 2013 | Xerox Phaser 5500/DN Laser Printer

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Code U4 Fuser failure - how much are fusers and can I replace myself or do I need a tech?


For the 4500, the fuser part number is 604K28532, iteminc.com has them in stock for $205, or refurbished using brand new rollers for for $185. here is a video that shows you how to replace it. Very easy with no tools required.

Aug 09, 2011 | Xerox Phaser 4500 Printer

1 Answer

Xerox Phaser 4500 printer has a U4 fuser code.


Hi,

From the Xerox Phaser 4500 Service Manual (here), the main problems could be one of:

  • Warm-up failure - Fuser warm-up not complete within 110 seconds after
  • starting.
  • 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 warm-
  • up has completed

It could be that your fuser needs to be replaced, but as you can see that code relates to a couple of problems, so even replacing the Fuser might not fix the problem.

If it doesn't even do the warm up checks it is likely to be the fuser because the other components such as STS failure and cooldown won't have had a chance to run..

May 03, 2011 | Office Equipment & Supplies

1 Answer

Error U4-1000 (Xerox CopyCentre C116 copier)


U4-1000 Indicates Fuser on time failure

Follow these steps:

1. Check for paper on the fuser.
Y remove paper N proceed to step 2
2. Check the installation of the fuser assembly, make sure it is securely installed.
Y reinstall fuser N proceed to step 3
3. Remove the fuser. Check the conductivity of the contact points of the thermostat, are the contact points connected
N replace the fuser

Apr 12, 2011 | Xerox CopyCentre C118 Copier

3 Answers

Fuser error code u4


You would have to replace the fuser to resolve that code.

Jan 06, 2010 | Xerox Phaser 4500 Printer

1 Answer

Open heat error


One of 2 things is happening, Either the Heating element is going bad, or more likely the thermistor that monitors the temperature of the fuser is intermittent. You will most likely need to replace the fuser to resolve the issue. That machine has a one year on site warranty. If its less than a year old Xerox will fix it for you free of charge.

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U4 error code - Xerox 5328 copier


U4-2 Low fuser temp problem U4-3 High fuser temp problem U4-4 High fuser temp problem U4-6 High fuser temp problem

replace thermistor in fuser unit

Oct 03, 2008 | Office Equipment & Supplies

1 Answer

Xerox212


that error is for the FUSER unit

Sep 30, 2008 | Xerox Phaser 8400 Laser Printer

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