Common Fuser Errors


The most common Fuser Error, with possible cause and remedies.

Associated LaserJet Models:

HP Laserjet 4200

HP Laserjet 4240

HP Laserjet 4250

HP Laserjet 4300

HP Laserjet 4350

HP Laserjet 4345MFP

Control Panel Message:
For help press ?

Fusing Error Code X - Description
50.1 Fuser Error Low Fuser Temperature
50.2 Fuser Error Fuser Warm Up Service Error
50.3 Fuser Error Fuser Temperature too High
50.4 fuser Error Faulty Fuser Error
50.5 Fuser Error Incorrect Fuser Installed
50.6 Fuser Error Fuser Circuit Open


1 Recycle power on device in order to allow printing device to cool down.

2 Check  that the correct model of fusing Assembly is installed.

3 Verify that the correct voltage fusing Assembly is installed.

4 Reinstall the fusing Assembly, and check the connection between the fusing assembly and the printer. Replace the connector if it is damaged.

5 Replace the fusing Assembly.

6 Replace the DC Controller PBC.

7 Replace the (LVPS) power-supply assembly.


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