mypros+
Error code reference

Samsung Hood Error Code E-21

Temperature sensor open error.

Samsung codesSamsung hood codes

Temperature sensor open error.

MyPros+ Max

Get the full diagnostic procedure for E-21.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E-21 means on a Samsung hood

The E-21 error code on a Samsung hood indicates a temperature sensor open circuit fault. In this context, "open" means the electrical circuit running through the temperature sensor has been broken, preventing the control board from receiving any resistance signal from the sensor. The temperature sensor in a range hood monitors heat levels within the unit, typically to protect internal components such as the motor and control board from overheating. When the circuit is open, the board interprets the absence of a signal as a fault condition and displays E-21 to alert the user.

An open circuit in the temperature sensor is most commonly caused by a physically damaged or broken sensor element, a disconnected or corroded wiring harness connector, or a wire that has burned through due to prolonged heat exposure near the cooking surface. Unlike a short circuit fault, an open error means the resistance reading has gone to infinity, indicating the sensor or its wiring is no longer providing a continuous conductive path back to the control board.

Diagnosing this fault requires inspecting the sensor wiring for visible damage, checking connector integrity at both the sensor and control board ends, and using a multimeter to measure continuity or resistance across the sensor terminals. A functioning temperature sensor should produce a measurable resistance reading. A reading of infinite resistance or "OL" on a multimeter confirms the open condition. If wiring and connectors check out, the sensor itself has likely failed and will need replacement.

Source: manufacturer service documentation.

Common causes of E-21

  1. 01

    Failed temperature sensor

    Part replacement

    The sensor element itself may have burned out or broken internally, resulting in an open circuit with infinite resistance. This is the most frequent hardware cause of this code.

  2. 02

    Disconnected wiring harness connector

    Wiring / connection

    The connector linking the temperature sensor to the control board may have worked loose over time due to vibration. Inspect both ends of the harness for a secure, fully seated connection.

  3. 03

    Damaged or burned wiring

    Part replacement

    Wires routed near the heat exhaust path can degrade and eventually break under sustained high temperatures. Look for any wire insulation that appears melted, brittle, or visibly broken.

  4. 04

    Corroded connector terminals

    Wiring / connection

    Grease and steam from cooking can cause corrosion on the sensor connector pins, increasing resistance to the point of an open circuit. Check terminals for discoloration or residue buildup.

  5. 05

    Faulty control board

    Part replacement

    In rare cases, the control board's sensor input circuit may have failed, causing it to incorrectly report an open sensor condition even when the sensor and wiring are intact.

See the test procedure for each cause

Frequently asked questions about E-21

What does E-21 mean on a Samsung hood?
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.
Can I fix the E-21 error myself?
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.
Is it safe to use my Samsung hood while E-21 is displayed?
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.
How much does it cost to repair the E-21 error on a Samsung hood?
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.
Will resetting my Samsung hood clear the E-21 error?
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.

Related Samsung hood codes

All Samsung hood codes
View all 37 Samsung hood codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass