Fuser Error. Low Temperature

Steps To Fix HP Printer is Displaying A 50.4 Error Message

1. First thing you have to do is to cancel all the pending printing jobs in the queue.
2. Now switch-off your printer and leave it for few seconds to cool it down.
3. After cooling down the printer completely, the fuser failure error appears on the display screen.

https://www.hpprintersupportpro.com/blog/hp-printer-is-displaying-a-50-4-error-message/


https://www.laserprinterservices.com/hperrorcodes.html
HP Printer Error Codes HP Laser Printer Error Code 13.4 paper jam 50.1 Bad Low Voltage Power Supply 13.5 Paper jam in the fuser 50.2 Fuser Error 13.6 Paper jam in the fuser 50.5 Fuser Error 13.20 jam in the paper feed drive 50.9 Fuser Error

Did you make a repair or replace the fuser and need to reset the code?; Because if you didn't fix the problem, you'll still get the same low fuser temperature error code.
Press <function>, <original size (ledger)>, <3>
to enter service mode, go to F9-05-04 (RAM Initialize, fuser reset, power off/on)
If the E4-01 error code returns you have a defective thermistor/thermostat.

H4 indicates "low temperature", possibly caused by a failure of the heater lamp or fuser. Sometimes this error is shown without an actual damage when the power cord is pulled without shutting down the copier first.

To cancel the error code, press [CLEAR], [AUTO], [CLEAR], [AUTO] in rapid succession. The display should go blank. Next, select 14 (clear low temperature code), press [START]. Finally, switch off and on the machine.

If there was no actual damage (i.e. power cord pulled), the machine should be OK again. If the error persists, immediately or after short time of operation, you will need to contact Sharp technical service for repair.

H4 indicates "low temperature", possibly caused by a failure of the heater lamp or fuser. Sometimes this error is shown without an actual damage when the power cord is pulled without shutting down the copier first.

To cancel the error code, press [CLEAR], [AUTO], [CLEAR], [AUTO] in rapid succession. The display should go blank. Next, select 14 (clear low temperature code), press [START]. Finally, switch off and on the machine.

If there was no actual damage (i.e. power cord pulled), the machine should be OK again. If the error persists, immediately or after short time of operation, you will need to contact Sharp technical service for repair.

H4 indicates "low temperature", possibly caused by a failure of the heater lamp or fuser. Sometimes this error is shown without an actual damage when the power cord is pulled without shutting down the copier first.

To cancel the error code, press [CLEAR], [AUTO], [CLEAR], [AUTO] in rapid succession. The display should go blank. Next, select 14 (clear low temperature code), press [START]. Finally, switch off and on the machine.

If there was no actual damage (i.e. power cord pulled), the machine should be OK again. If the error persists, immediately or after short time of operation, you will need to contact Sharp technical service for repair.

You have a failure in the Fusing Unit:
E4- 01 Fuser warm-up temperature
1. Fuser Thermistor is dirty.
2. Thermistor position is incorrect.
3. Fuser temperature is low.
4. Thermistor is defective.
5. Fuser Lamp connector is disconnected.
6. Fuser Thermostat is defective.
7. Fuser Lamp is defective.
8. HTC PCB connector (CN716) is disconnected
You can try resetting the error by using this key sequence:
enter simulation mode by pressing keys ''Function + Original Size + 3 ''
go to f9 mode ,06 (ram initialize ) sub code 04 to reset fuser error.
If the code comes back you will need a service technician to diagnose which part is bad.

H4-00 on Sharp means that the temperature inside the printer is too low. That is usually the fuser lamp, and sometimes the temp sensor jammed.

Only when the problem is a jammed temp sensor or a jammed control board you can reset the machine by doing a reset.

You try reset from simulation mode by following procedure below:
Clear key >>Interrupt key >> "0" key >> Interrupt key >> Main code >>Start key >> Sub code >> Start key

If the error remains, that means that the fuser is really bad and must be replaced.

When this happen you need to have the fuser unit replaced, if that does not fix the problem the technician will replace the temperature sensor.

try to clear in service mode touch Additional funcion key then 2 8 at same time then additional func key again in that order screen should change to service mode then touch copier then function then clear then err then ok then turn off machine using main switch if it wont clear you have a bad fuser

50.1 error is usually a fuser low temperature error. The thermistor (electronic termometer) that controls high and low temperature is either obstructed, damaged or the heating element inside the fuser has been brokem or damaged. Carefully remove and inspect the fuser. If you have no obstructions then the fuser will have to be replaced.

Here's a link to the full service manual in PDF for free. Good luck.

http://www.feedroller.com/Store/Service%20Manual/Color%20LaserJet%203500-3550-3700.pdf

921 Fuser Error Indicates that the fuser is below standby temperature when the printer is idle.
Error codes 920, 921, and 922 may display for a cold fuser failure. A 920 error caused by low line voltage can sometimes be cleared by turning the machine off and then on again.
Service Tip: Set the Fuser Temperature to NORMAL before starting this service check.
Manually spin the fan and check that
it rotates freely. Check the cable
connection to the engine board, J13
for correct installation.