Samsung Microwave Error Code error3

Error3 on a Samsung microwave means the thermal or humidity sensor's output voltage (Vout) did not drop below 4.7 volts during the cooling mode within a 3-minute period after cooking. The control board uses this voltage reading to confirm the oven is cooling properly. If the voltage stays too high for too long, the board flags the fault. The cause could be a genuinely hot oven, a failing sensor, a cooling fan problem, or a wiring issue.

Unplugging the microwave for a few minutes may temporarily clear the error3 display, but the code will return if the underlying cause is not resolved. If the oven was simply overheated from extended use, a full cool-down period followed by a power reset will often resolve it. A persistent error after the unit has cooled completely points to a hardware fault that requires further diagnosis.

Repair costs vary depending on the faulty component. A replacement humidity or thermal sensor typically runs in the range of $15 to $50 for the part alone. A cooling fan motor may cost between $20 and $60 in parts. If a control board replacement is needed, parts alone can range from $80 to $200 or more, and professional labor will add to the total cost in any case.

Start by letting the oven cool for at least 5 minutes, then attempt to operate it again. If the error returns, check that the cooling fan is running after cooking ends. If the fan is working normally, the humidity or thermal sensor may need to be tested or replaced. Inspect all wiring connections to the sensor before replacing any components.

It is best to avoid using the microwave until error3 has been diagnosed and resolved. The code indicates the cooling system is not functioning as expected, which can allow heat to build up inside the unit. Continuing to operate the appliance under this condition could potentially cause further damage to internal components.