Error code reference

Samsung Refrigerator Error Code FZ-DEF Error

Freezer defrost heater error; defrosting does not finish after heating continuously for more than 70 minutes

Freezer defrost heater error; defrosting does not finish after heating continuously for more than 70 minutes. Caused by heater housing separation, contact error, disconnection, short circuit, or temperature fuse error.

First step from the service manual

Separate MAIN PCB CN70 wire from PCB; measure resistance between CN70 Brown and CN70 Gray; should be 63(230) ohm ±7%. 0 ohm = heater short, infinity = wire/bimetal open.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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