Samsung Refrigerator Error Code 42C

Error code 42C indicates a communication error between the Main PCB and the Inverter PCB inside your Samsung refrigerator. These two control boards must exchange data continuously to manage compressor operation and cooling. When that communication is interrupted or fails, the refrigerator logs the 42C fault. The cause can be a loose cable, a damaged wiring harness, or a defective board on either end of the connection.

A 42C error means the compressor control system is not operating normally, so your refrigerator may not be cooling reliably. Continuing to store perishable food while this fault is active risks spoilage. It is best to address the error promptly and transfer perishables to another cooling source until the repair is complete.

A power reset may temporarily clear the 42C code from the display, but the error will return if the underlying cause, such as a loose cable or a defective board, has not been corrected. Resetting the unit is a reasonable first step to see if the fault was a temporary glitch, but a persistent 42C after a reset confirms a hardware problem that requires hands-on diagnosis and repair.

A knowledgeable DIYer can start by checking the cable connection between the Main PCB and the Inverter PCB, since a loose connector is the most common cause and requires no parts. If the connectors are firmly seated and the wiring looks undamaged, the repair moves on to board replacement, which is more involved. Replacing a PCB requires comfort working with refrigerator electronics and correctly identifying the right replacement part. If you are unsure, a qualified appliance technician is the safer option.

If the fix is simply reseating a loose connector, there may be no parts cost, though a service call fee will still apply. If the Inverter PCB needs replacement, parts and labor typically run in the range of $150 to $350. Replacing the Main PCB can add another $100 to $250 in parts depending on the model. Replacing both boards at once will be at the higher end of the total repair cost range.