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Error code reference

Daewoo Refrigerator Error Code F2

Short F-sensor (freezer temperature sensor short circuit detected).

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Short F-sensor (freezer temperature sensor short circuit detected).

First step from the service manual

Check if the voltage of port 3 in micom is lower than 0.2V; check the connection state of connector C3 on M-PCB; check characteristics of diodes D02, D04; verify resistance value of R6 matches standard value.

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

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What F2 means on a Daewoo refrigerator

The F2 error code on a Daewoo refrigerator indicates a short circuit condition in the freezer temperature sensor, commonly called the F-sensor. This sensor is a thermistor that continuously monitors the freezer compartment temperature and sends resistance-based signals to the main control board (M-PCB). When a short circuit occurs in the sensor circuit, the resistance drops abnormally low, causing the voltage at port 3 of the micom (microcomputer controller) to fall below 0.2V. This is the primary indicator the control board uses to detect a short fault rather than an open circuit or normal operating range.

Diagnosis focuses on several components in the sensor signal path. The first check is confirming that the micom port 3 voltage reads below 0.2V, which confirms the short condition is being actively detected. From there, the connector C3 on the M-PCB should be inspected for corrosion, bent pins, or a loose connection that could cause an unintended ground path. Diodes D02 and D04 in the sensor circuit must also be tested, as a shorted diode can pull the signal line low and mimic a sensor short. Finally, resistor R6 should be measured and compared against its standard value, since a failed resistor in the voltage divider network can corrupt the sensor reading and trigger the F2 code even when the thermistor itself is functioning correctly.

Source: manufacturer service documentation.

Common causes of F2

  1. 01

    Faulty F-sensor (freezer thermistor)

    Part replacement

    The thermistor itself can develop an internal short, causing its resistance to drop far outside the normal operating range and pulling the micom port 3 voltage below 0.2V. Disconnect the sensor and measure its resistance directly to confirm failure.

  2. 02

    Loose or corroded connector C3 on M-PCB

    Wiring / connection

    Connector C3 links the F-sensor wiring harness to the main control board. Corrosion, moisture intrusion, or a partially seated connector can create a short to ground. Inspect the connector pins visually and reseat the connector firmly.

  3. 03

    Shorted diode D02 or D04

    Part replacement

    Diodes D02 and D04 are part of the sensor signal conditioning circuit on the M-PCB. A shorted diode creates a low-resistance path that pulls the sensor signal line to near ground, triggering the F2 fault even if the thermistor is good.

  4. 04

    Out-of-specification resistor R6

    Part replacement

    Resistor R6 is part of the voltage divider network used to interpret the thermistor signal. If its resistance value has drifted or it has failed short, the micom receives an artificially low voltage reading at port 3 and registers the F2 code.

  5. 05

    Damaged sensor wiring harness

    Part replacement

    The wire harness running from the freezer sensor to the M-PCB can be pinched, chafed, or have insulation damage that causes two conductors to contact each other or contact a grounded surface. Trace the wiring visually for any signs of damage.

See the test procedure for each cause

Frequently asked questions about F2

What does F2 mean on a Daewoo refrigerator?
The F2 code means the control board has detected a short circuit in the freezer temperature sensor circuit. Specifically, the voltage at the sensor input port on the micom controller has dropped below 0.2V, which falls outside the normal operating range. The fault could be in the sensor itself, the wiring, connector C3 on the main board, or components like diodes D02 and D04 or resistor R6 on the M-PCB.
Can I fix the F2 error on my Daewoo refrigerator myself?
A knowledgeable DIYer can perform some of the diagnostic steps, such as inspecting and reseating connector C3, checking for visible wiring damage, and testing the freezer thermistor with a multimeter. However, testing and replacing surface-mount components like diodes D02 and D04 or resistor R6 on the M-PCB requires soldering skills and component-level board repair experience. Replacing the thermistor sensor is generally more accessible for a careful DIYer.
Is it safe to keep using my refrigerator while the F2 error is showing?
It is not recommended to continue using the refrigerator normally with an active F2 fault. Because the freezer temperature sensor is reporting incorrectly, the control board cannot accurately regulate freezer temperatures. This can lead to improper cooling, food safety risks, or the compressor running outside its intended parameters.
How much does it cost to repair a Daewoo refrigerator F2 error?
Repair costs vary depending on the root cause. Replacing a freezer thermistor sensor typically costs between $20 and $80 for the part, plus labor if a technician is hired. If the M-PCB requires component-level repair or full replacement, the cost can range from $80 to $250 or more depending on part availability and labor rates in your area.
Will resetting my Daewoo refrigerator clear the F2 error code?
A power reset may temporarily clear the F2 code from the display, but the error will return if the underlying short circuit condition is still present. The micom continuously monitors the sensor voltage, so as soon as it detects a reading below 0.2V at port 3 again, the F2 fault will reactivate. A permanent fix requires identifying and correcting the actual cause of the short circuit.

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