LG Refrigerator Error Code Fridge 2nd Digit f

This code indicates a CoolSelect Zone sensor error. The control board has detected that the sensor is disconnected, has an open or short circuit, or is reporting temperatures at or beyond +50°C or -50°C, all of which are outside the normal operating range. The fault can stem from a loose connector, damaged wiring, or a defective thermistor. The first diagnostic step is checking the voltage between pins 4 and 6 on the main PCB connector CN30, which should read between 1.0V and 4.5V.

The CoolSelect Zone compartment may not maintain accurate temperature while this error is active, which could affect the safety of food stored in that specific zone. The rest of the refrigerator may continue to operate, but it is best to avoid storing perishables in the CoolSelect Zone until the sensor issue is resolved.

Repair costs depend on what component has failed. Reseating a loose connector has no parts cost and minimal labor time. Replacing the CoolSelect Zone thermistor sensor typically runs in the range of $50 to $150 including parts and labor. If the main PCB is the root cause, that repair can range from $150 to $400 or more depending on the specific board and local labor rates.

Some causes of this error, such as a slipped connector, can be corrected without special tools by locating and reseating the connector at the CoolSelect Zone sensor or at the main PCB. However, testing thermistor resistance and measuring voltage at CN30 requires a multimeter and some comfort with appliance wiring. If the sensor or main board needs replacement, a qualified technician is recommended for those repairs.

A power reset may temporarily clear the error display, but the code will return if the underlying fault in the sensor circuit has not been corrected. The control board will continue to detect the out-of-range or missing sensor signal each time it runs its diagnostics. A reset is only a useful step to confirm whether the fault is intermittent, not a permanent fix.