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Error code reference

Samsung Multifunction Printer Error Code #02-000

Fuser system error

Samsung codesSamsung multifunction printer codes

Fuser system error: temperature below reference for 20 sec at warm up, abnormal ADC, or ZeroCross signal detect error.

First step from the service manual

In case of meaning 1, replace the Fuser unit. In case of meaning 3, replace the Engine control board or Fuser control board or SMPS.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What #02-000 means on a Samsung multifunction printer

The Samsung #02-000 error code indicates a fuser system fault with three possible root causes. The most common trigger is the fuser unit failing to reach its target operating temperature within the allotted warm-up window. If the fuser thermistor does not detect the expected temperature rise within 20 seconds of the warm-up cycle starting, the engine controller interprets this as a fuser failure and halts operation to prevent damage. This scenario typically points to a failed fuser heating element, a broken or out-of-tolerance thermistor, or a fuser unit that has reached end of life.

The second possible cause is an abnormal ADC (Analog-to-Digital Converter) reading. The ADC circuit is responsible for converting the analog thermistor voltage signal into a digital value the engine controller can process. If this conversion produces readings outside the expected range, the printer cannot reliably monitor fuser temperature and will throw the #02-000 code as a protective measure. This condition can stem from a faulty thermistor, a damaged signal trace, or a failing engine or fuser control board.

The third cause is a ZeroCross signal detection error. The ZeroCross signal is generated by the SMPS (Switched Mode Power Supply) and is used to synchronize the fuser heater's AC power switching with the AC line frequency. If this synchronization signal is absent or corrupted, the heater cannot be properly controlled. In this case, the fault source may be the SMPS, the engine control board, or the fuser control board. Diagnosing which of the three causes is active requires systematic component testing.

Source: manufacturer service documentation.

Common causes of #02-000

  1. 01

    Failed or worn fuser unit

    Part replacement

    The fuser heating element or internal thermistor has failed, preventing the fuser from reaching operating temperature within 20 seconds during warm-up. This is the most common cause and is confirmed by replacing the fuser unit.

  2. 02

    Defective fuser thermistor causing abnormal ADC readings

    Part replacement

    The thermistor inside the fuser may be producing out-of-range resistance values, causing the ADC circuit to report invalid temperature data. Checking thermistor resistance against specification can help confirm this before replacement.

  3. 03

    SMPS failure causing missing ZeroCross signal

    Part replacement

    The Switched Mode Power Supply generates the ZeroCross signal required to synchronize AC power to the fuser heater. A failing SMPS can cause this signal to be absent or erratic, triggering the error.

  4. 04

    Engine control board or fuser control board fault

    Part replacement

    If the ZeroCross signal from the SMPS is present but the board cannot process it correctly, the engine control board or fuser control board may be the point of failure. This is typically diagnosed after ruling out the SMPS and fuser unit.

  5. 05

    Poor electrical connection to the fuser unit

    Wiring / connection

    Loose or corroded connectors between the fuser unit and the control board can interrupt temperature sensing and heater control signals, mimicking a component failure. Inspecting and reseating all fuser-related connectors should be done before replacing boards.

See the test procedure for each cause

Frequently asked questions about #02-000

What does #02-000 mean on a Samsung multifunction_printer?
The #02-000 error code signals a fuser system fault. It can mean the fuser failed to reach its target temperature within 20 seconds during warm-up, the ADC circuit received abnormal temperature sensor readings, or the ZeroCross signal from the power supply was not detected. The printer stops operation to protect against unsafe fuser conditions.
Can I fix the #02-000 error myself, or do I need a technician?
Some users with mechanical comfort can replace the fuser unit themselves, as it is a user-serviceable component on many Samsung printer models. However, if the fault is traced to the SMPS, engine control board, or fuser control board, those repairs involve higher-voltage components and soldering, which are better handled by a qualified technician. Always disconnect power before opening the printer.
Is it safe to keep using my printer when error #02-000 appears?
No, you should not attempt to continue printing while this error is active. The fuser operates at high temperatures, and if the temperature control or sensing circuit is compromised, there is a risk of overheating. The printer disables itself for this reason, and bypassing that protection is not recommended.
Will resetting the printer clear the #02-000 error?
A power cycle may temporarily clear the error display, but the underlying fault will almost certainly cause the code to return once the printer attempts to warm up again. A reset does not repair a failed fuser, a faulty thermistor, or a defective SMPS. The root cause must be identified and corrected for the error to be resolved permanently.
How much does it cost to repair a Samsung printer with error #02-000?
If the fuser unit is the cause, replacement fuser units for Samsung printers typically range from $30 to $120 depending on the model. If the SMPS or a control board is at fault, parts and labor can push repair costs into the $100 to $300 range. In some cases, particularly for older models, the cost of repair may approach the value of the printer itself.

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