- Printers
- Laser printer
50.XX
HP 50.XX on LaserJet Pro laser printer: fuser failure message
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
A 50.xx on your HP LaserJet Pro is a fuser failure and the printer stops printing. Turn it off at the power switch, wait at least 30 seconds and turn it on; if it runs through a surge protector, plug it straight into the wall. If it returns, HP says the fuser must be replaced.
Safety first
Stop and check this first
- Do not take the fuser apart or remove screwed covers or the power supply; HP handles the replacement through its support.
- The fuser gets very hot during printing: keep your hands away from that area right after use and let it cool before opening any door.
Safe checks you can perform
- Write down the exact sub code
- Restart at the power switch and wait 30 seconds
- Take the surge protector out of the circuit
Leave these tasks to a qualified professional
- Do not attempt this professional task: Fuser replacement through HP support
- Do not attempt this professional task: Diagnosis if the fault returns with a new fuser
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Fuser replacement through HP support
What they doIf the 50.xx keeps coming back after the restart and the direct wall connection, open a case at www.hp.com/go/support so HP or an authorised provider replaces the fuser.
They must show youthe recorded 50.xx sub code, the removed fuser and a test page printed after the swap.
In writingthe case number, the part replaced and whether the repair is covered by warranty.
Diagnosis if the fault returns with a new fuser
What they doFor the fuser drive circuit or sub thermistor sub codes, ask the authorised service to confirm the origin before the case is closed.
They must show youthe exact code the printer arrived with and the test run after the repair.
In writingthe cause found, the parts changed and the warranty status.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Write down the exact sub code
- Who:
- you.
- How:
- copy the full number shown on the control panel (for example 50.10 or 50.3000) and match it against the HP list: low or high temperature, slow fuser, fuser open, drive circuit or sub thermistor.
- Result that matters:
- knowing which variant of fuser failure the printer is reporting.
- If the code starts with 50:
- carry on with the restart HP asks for.
- If the code starts with another number:
- look up that specific code, it is not a fuser failure.
- Evidence to keep:
- photo of the panel where the whole code is readable.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages · HP LaserJet Pro - Solución de mensajes de la versión 50.xx (error de fusión)
Restart at the power switch and wait 30 seconds
- Who:
- you.
- How:
- turn the printer off with its power switch, wait no less than 30 seconds, turn it back on and let it finish initializing before sending any job.
- Result that matters:
- the printer starting up without showing the 50.xx again.
- If it starts normally and prints:
- note the episode in case it comes back.
- If the message returns:
- check how the printer is plugged in.
- Evidence to keep:
- when you restarted it and whether the 50.xx reappeared.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages
Take the surge protector out of the circuit
- Who:
- you.
- How:
- if the printer is on a power strip or surge protector, power it off, remove that protector, plug the cord directly into a wall socket and turn the printer on again.
- Result that matters:
- ruling out the power feed as the trigger for the error.
- If the 50.xx no longer appears:
- keep it plugged straight into the wall.
- If it still appears after the restart:
- HP says the fuser has to be replaced through its support.
- Evidence to keep:
- photo of the direct wall connection and of the panel after power on.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Printers
- Brand
- HP
- Product type
- Laser printer
Known code variants
- HP 50.00
- HP 50.10
- HP 50.10 low fuser temperature
- HP 50.20
- HP 50.20 slow fuser
- HP 50.2000
- HP 50.30
- HP 50.30 high fuser temperature
- HP 50.3000
- HP 50.4000
- HP 50.4000 fuser drive circuit
- HP 50.70
- HP 50.70 fuser open
- HP 50.7000
- HP 50.8000
- HP 50.9000
- HP 50.xx
- HP 50.xx error
- HP error de fusión 50.xx
- HP LaserJet Pro 50.00
- LaserJet Pro error del fusor 50
- LaserJet Pro fuser error 50
What it means
HP groups LaserJet Pro fuser failures under 50.xx. Its English guide lists 50.00 (generic), 50.10 (low fuser temperature), 50.20 (slow fuser), 50.30 (high fuser temperature) and 50.70 (fuser open); the Spanish table uses the long format: 50.2000, 50.3000, 50.4000 (fuser drive circuit), 50.7000 and 50.8000 or 50.9000 (low or high sub thermistor). All of them stop the printer. Seeing the number is not yet enough to blame the fuser: HP first asks for a restart and removing any surge protector.
Warnings and stop conditions
- Mediumsource verified
Do not take the fuser apart or remove screwed covers or the power supply; HP handles the replacement through its support.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages · HP LaserJet Pro - Solución de mensajes de la versión 50.xx (error de fusión)
- Highsource verified
The fuser gets very hot during printing: keep your hands away from that area right after use and let it cool before opening any door.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages
Symptoms and causes
Probable causes · in order
- Fuser temperature out of the expected rangeCommon
The low temperature, high temperature and slow fuser sub codes (50.10, 50.20, 50.30, or 50.2000 and 50.3000) mean the fuser is not heating the way the printer expects.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages · HP LaserJet Pro - Solución de mensajes de la versión 50.xx (error de fusión)
- Printer sees the fuser as openPossible
HP lists the fuser open error as 50.70 in its English guide and as 50.7000 in the Spanish table; with no further detail, it handles it like the rest of the family.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages · HP LaserJet Pro - Solución de mensajes de la versión 50.xx (error de fusión)
- Power fed through a surge protectorPossible
One official step is to remove the surge protector and plug the printer straight into the wall socket, which points to the power feed as something to rule out.
Evidence: HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages
- Fuser drive circuit or sub thermistorPossible
The Spanish table adds 50.4000 (fuser drive circuit) and 50.8000 or 50.9000 (low or high sub thermistor), which HP also resolves by replacing the fuser.
Evidence: HP LaserJet Pro - Solución de mensajes de la versión 50.xx (error de fusión)
Virtual technician
Does 50.XX still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
HP LaserJet Pro - Troubleshoot 50.xx (fuser failure) messages
HP Support · 2026 · official_doc
- 2
HP LaserJet Pro - Solución de mensajes de la versión 50.xx (error de fusión)
Soporte HP · 2026 · official_doc
Was this entry useful?