Samsung Refrigerator Error Code Fridge 2nd digit f

The second digit 'f' in the fridge display indicates a CoolSelect Zone sensor error. The main PCB is receiving a temperature reading from the CoolSelect Zone thermistor that falls outside the valid range, specifically at or above +50°C or at or below -50°C. This is caused by a disconnected connector, broken wire, short circuit, or a failed sensor. The first diagnostic step is to check the voltage between pins 4 and 6 on connector CN30 at the main PCB, which should read between 1.0V and 4.5V under normal conditions.

Because the CoolSelect Zone is a separate compartment from the main fridge and freezer sections, the rest of the refrigerator may continue to operate normally. However, the CoolSelect Zone itself cannot be trusted to maintain accurate temperatures while this error is active, so any food stored in that compartment is at risk. It is best to clear the compartment and arrange service promptly rather than rely on the affected zone for food storage.

If the fix is simply reseating a loose connector, there may be no parts cost at all, only a service call fee which typically ranges from $75 to $150 depending on your area. Replacing the CoolSelect Zone thermistor sensor generally costs between $20 and $60 for the part, plus labor. If the main PCB turns out to be the cause, board replacement can range from $150 to $400 or more for parts alone, making professional diagnosis important before committing to that repair.

A knowledgeable DIYer can start by unplugging the refrigerator, locating the CN30 connector on the main PCB, and checking that it is fully seated and free of corrosion. If the connector is secure, testing voltage at CN30 pins 4 and 6 with a multimeter requires basic electrical skills and is a reasonable next step. Replacing the thermistor sensor is also within reach for a confident DIYer, but tracing a wiring harness fault or replacing the main PCB is best left to a qualified technician.

A power reset, such as unplugging the unit for a few minutes and restoring power, may temporarily clear the display, but the error will return if the underlying fault in the sensor circuit is not resolved. The code is generated because the main PCB is actively detecting an out-of-range signal, so the root cause must be corrected for the error to clear permanently. Do not rely on a reset as a fix.