Magic Chef Microwave Error Code Err 3

Err 3 means the microwave's control board has detected that the temperature sensor is disconnected from the circuit. The temperature sensor monitors heat levels inside the unit to keep it operating safely. When this signal is lost, the microwave stops functioning and displays the error code. The unit should be unplugged and inspected by a qualified technician.

Unplugging the microwave and plugging it back in may temporarily clear the display, but Err 3 will return if the underlying issue with the temperature sensor or its wiring has not been resolved. A reset does not fix a disconnected sensor or a broken wire. The root cause must be identified and corrected for the error to go away permanently.

Repair costs depend on what component has failed. If the fix is simply reseating a loose connector, a service call fee in the range of $50 to $100 may be the primary cost. Replacing a failed temperature sensor typically adds $20 to $60 in parts. A control board replacement would be more expensive, potentially ranging from $80 to $200 or more including labor, at which point comparing the repair cost to the price of a new unit is worth considering.

This repair is not recommended as a DIY project for most homeowners. The interior of a microwave contains a high-voltage capacitor that can hold a dangerous charge even after unplugging the unit. Diagnosing Err 3 requires safely discharging that capacitor before inspecting wiring or sensor components, which is a task best left to a trained appliance technician.

No. Err 3 indicates the microwave cannot monitor its internal temperature, which means a key safety system is not functioning. Continuing to operate the unit in this condition could pose an overheating risk. The microwave should be unplugged until the fault is properly diagnosed and repaired.