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Error code reference

Daewoo Freezer Error Code F3

Defrost termination is done by time limit rather than by D-Sensor temperature.

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What the F3 error code actually means

Your Daewoo freezer ran its defrost cycle but the sensor that is supposed to stop the cycle when the freezer reaches the right temperature did not work correctly, so the freezer shut down the defrost cycle based on a timer instead. This usually means either the defrost heater or the temperature sensor involved in defrosting has failed. A technician will need to test these components to find out which one needs to be replaced.

Diagnostic procedure

The full F3 procedure

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1
First diagnostic step
Measure the resistance between terminal PIN 1 and 7 after disconnecting CN1 on the Main PCB; if defrost heater resistance is not within 71-84 ohms, change the heater.
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Most common causes of F3

Ranked by how often they cause this code
  1. 1Failed defrost heater
  2. 2Faulty D-Sensor (defrost termination sensor)
  3. 3Damaged or corroded CN1 connector
  4. 4Broken wiring harness
  5. 5Excessive frost accumulation blocking the D-Sensor

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Questions people ask about F3

What does F3 mean on a Daewoo freezer?
The F3 code on a Daewoo freezer means the defrost cycle ended by reaching its maximum time limit rather than by the D-Sensor detecting the correct cutoff temperature. This indicates a problem with either the defrost heater or the D-Sensor circuit. The freezer completed a timed fallback shutdown to avoid damage, but the underlying fault needs to be diagnosed and repaired.
Will resetting the freezer clear the F3 error code?
Resetting the freezer may temporarily clear the F3 display, but the code will return if the underlying fault is not repaired. Because the error is triggered by a failed defrost cycle rather than a one-time glitch, the defrost heater or D-Sensor fault must be addressed before the error will stay cleared.
How much does it cost to repair a Daewoo freezer F3 error?
Repair costs depend on which component has failed. A replacement defrost heater typically costs between $20 and $60 for the part, while a D-Sensor is generally in the $15 to $40 range. Adding professional labor, total repair costs commonly fall between $100 and $250 depending on your location and the technician's rates.
How do I fix the F3 error on my Daewoo freezer?
Start by disconnecting CN1 on the main PCB and measuring resistance between PIN 1 and PIN 7. If the reading is outside the 71 to 84 ohm range, the defrost heater needs to be replaced. If heater resistance is within spec, the next step is to test the D-Sensor and its wiring for continuity and correct resistance values. Also inspect the CN1 connector for corrosion or loose pins.
Is it safe to use my Daewoo freezer while the F3 code is active?
An active F3 code means the defrost system is not operating correctly, which can lead to progressive frost buildup on the evaporator coils over time. If left unrepaired, this frost buildup will eventually restrict airflow and cause the freezer to lose its ability to maintain proper temperatures. It is best to address the fault promptly to avoid food spoilage and potential secondary damage to other components.

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