Samsung Refrigerator Error Code 46C

The 46C code indicates an error in the Ice Room heater circuit. The refrigerator's control board has detected that the resistance reading from the ice room heater, measured between pins 19 and 23 of connector CN20, is outside the acceptable range of 135 ohms plus or minus 7%. A reading of 0 ohms means the heater has shorted, while an infinite reading means there is an open circuit in the heater, wiring, or bimetal cutout.

A failed ice room heater can lead to excessive ice buildup inside the ice compartment, which may interfere with ice maker operation or airflow. While the refrigerator may continue cooling, leaving a shorted heater unaddressed poses a greater concern than an open circuit. It is best to have the fault diagnosed and repaired promptly rather than continuing to operate the unit with a known electrical fault.

Repair costs depend on which component has failed. Replacing a heater element or bimetal cutout typically involves parts costs in the range of $20 to $80, while a main PCB replacement can range from $100 to $300 or more for the part alone. Adding professional labor, the total repair cost commonly falls between $100 and $400 depending on the fault and service rates in your area.

A knowledgeable DIYer comfortable with a multimeter can perform the initial resistance test by disconnecting the CN20 connector from the main PCB and measuring between pins 19 and 23 on the harness side. If the reading is 0 or infinite, the heater assembly or wiring will need to be replaced. Sourcing the correct heater component and safely accessing the ice room compartment can be challenging, so professional service is recommended if you are not experienced with appliance repair.

A reset may temporarily clear the error from the display, but the code will return if the underlying fault in the ice room heater circuit is still present. The resistance of the heater circuit must measure within the specified range of approximately 125 to 145 ohms before the error will clear permanently. Resetting without repairing the component is not a lasting solution.