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Error code reference

Daewoo Microwave Error Code Err 2

Thermistor circuit fault

Daewoo codesDaewoo microwave codes

Thermistor circuit fault — thermistor reads open or shorted, or heater circuit failure detected.

First step from the service manual

Check continuity of thermistor (resistance should be approx 200k–300kΩ at room temperature); if 0Ω or infinite, replace thermistor.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What Err 2 means on a Daewoo microwave

Err 2 on a Daewoo microwave indicates a fault in the thermistor circuit. The thermistor is a temperature-sensing resistor that monitors internal cavity or component temperatures during operation. The control board continuously reads the thermistor's resistance value to verify safe operating conditions. When the board detects a resistance reading that falls outside the expected range, either near zero ohms (indicating a short) or infinite ohms (indicating an open circuit), it flags the Err 2 code and halts operation to prevent damage or unsafe conditions.

At room temperature, a functioning thermistor should measure approximately 200k to 300k ohms. A shorted thermistor reads close to 0 ohms, while a failed open thermistor reads infinite resistance on a multimeter. Both conditions cause the control board to interpret the temperature data as invalid. In addition to thermistor failure, Err 2 can also point to a heater circuit fault, meaning wiring, connectors, or components associated with the heating circuit may be damaged or disconnected.

Common causes include physical damage to the thermistor from heat exposure over time, corroded or loose connector pins in the thermistor wiring harness, and breaks or shorts in the wiring between the thermistor and the control board. A technician should disconnect the thermistor from the circuit and test it in isolation before assuming the control board itself is at fault.

Source: manufacturer service documentation.

Common causes of Err 2

  1. 01

    Failed thermistor (open circuit)

    Part replacement

    The thermistor has broken internally and reads infinite resistance on a multimeter. This is the most common cause of Err 2 and requires replacing the thermistor.

  2. 02

    Shorted thermistor

    Part replacement

    The thermistor has failed in the opposite direction, reading near 0 ohms instead of the expected 200k to 300k ohms at room temperature. A shorted thermistor cannot provide usable temperature data and must be replaced.

  3. 03

    Loose or corroded thermistor connector

    Wiring / connection

    The connector pins linking the thermistor to the control board wiring harness can loosen or corrode over time, interrupting the circuit. Inspect the connector for signs of oxidation, bent pins, or poor seating before replacing parts.

  4. 04

    Damaged thermistor wiring

    Part replacement

    Heat exposure inside the microwave cavity can degrade the insulation on the thermistor leads, causing a short or open in the wiring rather than the thermistor itself. Inspect the full length of the wiring for burn marks, melted insulation, or breaks.

  5. 05

    Heater circuit failure

    Part replacement

    If the thermistor and its wiring both test correctly, the fault may lie in the broader heater circuit. A component or connection in the heating circuit may have failed, triggering the same Err 2 code from the control board.

See the test procedure for each cause

Frequently asked questions about Err 2

What does Err 2 mean on a Daewoo microwave?
Err 2 indicates a thermistor circuit fault. The thermistor is a temperature-sensing resistor that should read approximately 200k to 300k ohms at room temperature. When the control board detects a reading of 0 ohms or infinite resistance, it triggers Err 2 and stops operation. The code can also appear if a heater circuit failure is detected.
Can I fix Err 2 on my Daewoo microwave myself?
A knowledgeable DIYer can perform the initial diagnosis by disconnecting the thermistor and testing its resistance with a multimeter. If the thermistor reads 0 ohms or infinite resistance, it needs to be replaced. Keep in mind that microwave capacitors can store a lethal charge even when unplugged, so you should discharge the capacitor before working inside the unit.
Is it safe to use my Daewoo microwave when Err 2 is displayed?
No, you should not continue using the microwave while Err 2 is active. The thermistor is a safety component that prevents overheating. Operating the unit with a faulty thermistor circuit means there is no reliable temperature monitoring in place, which could allow the microwave to overheat and cause damage or a fire hazard.
How much does it cost to repair Err 2 on a Daewoo microwave?
If only the thermistor needs replacement, the part cost is typically in the range of $10 to $40 depending on the model. If a professional technician performs the repair, total costs including labor generally fall between $80 and $180. If the heater circuit or control board is also involved, repair costs can be higher, and it may be worth comparing against the cost of a replacement unit.
Will resetting my Daewoo microwave clear the Err 2 code?
A reset by unplugging the microwave for a minute or two may temporarily clear the display, but Err 2 will return as soon as the control board reads the thermistor circuit again. Because the code is triggered by a measured electrical fault rather than a software glitch, the underlying problem with the thermistor or its wiring must be repaired for the code to stay cleared.

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