Samsung Hood Error Code E-21

E-21 indicates a temperature sensor open error, meaning the control board is not receiving any signal from the temperature sensor. The circuit between the sensor and the board has been broken, either at the sensor itself, in the wiring, or at a connector. The hood uses this sensor to monitor internal heat levels, and the fault must be resolved before normal operation can resume.

Operating the hood with an active E-21 error is not recommended. The temperature sensor is part of the overheat protection system, and running the hood without a working sensor means the unit cannot detect or respond to dangerous internal heat buildup. Until the fault is repaired, using the hood poses a risk of component damage or overheating.

A power reset, such as unplugging the hood or turning off the circuit breaker for a few minutes, may temporarily clear the error display. However, if the underlying open circuit fault in the temperature sensor or its wiring has not been repaired, the E-21 code will return once the unit powers back on and the control board re-checks the sensor circuit.

Some causes of E-21 are DIY-friendly, particularly a disconnected wiring harness connector, which simply needs to be reseated. If the sensor itself or the wiring has failed, replacement parts are required. A basic multimeter is needed to test for continuity across the sensor terminals and confirm whether the sensor or wiring is the source of the open circuit.

If only the temperature sensor needs replacement, parts typically range from around $15 to $60 depending on the specific hood model. If a technician is hired for diagnosis and repair, total service costs including labor generally range from $100 to $250. Control board replacement, if required, can push costs higher.