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Error code reference

Samsung Freezer Error Code 1

Freezer sensor (F-SENSOR) open or short circuit

Samsung codesSamsung freezer codes

Freezer sensor (F-SENSOR) open or short circuit - sensor pickup temperature over +50°C or under -50°C.

First step from the service manual

Check voltage between MAIN PCB CN30 #4 and #8, should be within 4.5V~1.0V.

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

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What 1 means on a Samsung freezer

Error code 1 on a Samsung freezer indicates a fault in the freezer temperature sensor, known as the F-SENSOR. The control system has detected that the sensor is either open (broken circuit) or short-circuited, resulting in a reported pickup temperature that falls outside the valid operating range: above +50°C or below -50°C. These extreme out-of-range readings tell the main PCB that the sensor signal is not plausible, triggering the error to prevent the unit from operating on bad temperature data.

The F-SENSOR is a negative temperature coefficient (NTC) thermistor whose resistance changes predictably with temperature. The main PCB supplies a reference voltage and reads the resulting voltage drop across the sensor circuit through connector CN30, specifically pins 4 and 8. A healthy sensor will produce a voltage reading within the 4.5V to 1.0V window across the operating temperature range. A reading outside this window, whether near 5V indicating an open circuit or near 0V indicating a short, confirms the fault. Wiring damage, connector corrosion, or a failed thermistor can all shift the voltage outside the acceptable band.

Common root causes include a physically damaged sensor probe, a broken or pinched wire harness between the sensor and the PCB, a corroded or improperly seated connector at CN30, or in rarer cases a failed main PCB that cannot correctly process the sensor signal. Ice buildup around the sensor mounting location can also stress the wiring over time. Accurate diagnosis begins at connector CN30 on the main PCB, measuring the voltage between pins 4 and 8 with a multimeter while the unit is powered.

Source: manufacturer service documentation.

Common causes of 1

  1. 01

    Failed F-SENSOR thermistor

    Part replacement

    The thermistor probe itself has failed internally, producing an open or short circuit. Resistance measured directly at the sensor terminals will be outside the expected range for the compartment temperature.

  2. 02

    Damaged or broken wire harness

    Wiring / connection

    The wiring between the F-SENSOR and the main PCB connector CN30 may be pinched, cut, or broken, creating an open circuit. Inspect the full wire run for visible damage, especially around door hinges and freezer compartment edges.

  3. 03

    Corroded or loose connector at CN30

    Wiring / connection

    Moisture can cause corrosion at the CN30 connector pins 4 and 8 on the main PCB, increasing resistance and pushing the voltage reading out of the 4.5V to 1.0V range. Reseating and cleaning the connector may resolve the fault.

  4. 04

    Ice buildup around sensor mounting location

    Wiring / connection

    Excessive frost or ice accumulation around the sensor probe can physically stress the wiring connections over time, eventually causing an intermittent or permanent open circuit.

  5. 05

    Faulty main PCB

    Part replacement

    If the sensor, wiring, and connector all check out correctly, the main PCB may be unable to supply or read the reference voltage at CN30 pins 4 and 8. This is the least common cause and should only be considered after other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about 1

What does 1 mean on a Samsung freezer?
Error code 1 on a Samsung freezer signals a fault with the freezer temperature sensor (F-SENSOR). The sensor circuit is either open or shorted, causing the control board to receive a temperature reading above +50°C or below -50°C, both of which are outside the valid operating range. The freezer cannot regulate temperature reliably without a working sensor signal.
Can I fix Samsung freezer error code 1 myself?
Some causes are DIY-friendly. Start by checking the sensor wiring and the connector at CN30 on the main PCB for visible damage, corrosion, or loose pins. Measuring voltage between CN30 pins 4 and 8 (should be between 1.0V and 4.5V) with a multimeter can help confirm whether the sensor or wiring is the problem. Replacing the thermistor sensor itself is a moderate repair, but diagnosing a faulty main PCB typically requires more advanced testing.
Is it safe to keep using my Samsung freezer when error code 1 is displayed?
It is not recommended to continue relying on the freezer while this error is active. Without a valid temperature sensor reading, the control board cannot accurately manage the cooling cycle, which means food safety temperatures may not be maintained. You should transfer frozen items to another freezer until the fault is diagnosed and repaired.
How much does it cost to repair Samsung freezer error code 1?
If only the F-SENSOR thermistor needs replacement, parts typically cost between $15 and $50, and a technician visit may add $80 to $150 in labor. If the main PCB is at fault, parts alone can range from $100 to $300 or more depending on the model, with additional labor on top. Wiring harness repairs generally fall toward the lower end of the cost range.
Will resetting my Samsung freezer clear error code 1?
A power reset (unplugging the unit for several minutes) may temporarily clear the error display, but if the underlying sensor fault is still present, the code will return once the unit restarts and re-checks the sensor circuit. A reset is useful for confirming whether the fault is intermittent, but it does not fix the root cause. Proper diagnosis and component repair or replacement are required to permanently clear the code.

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