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Error code reference

Haier Washer Error Code Err3

Temperature sensor fault

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Temperature sensor fault – temperature sensor resistance is over specification (over 2Ω deviation).

First step from the service manual

Check whether the temperature sensor is well linked.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
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What Err3 means on a Haier washer

Err3 on a Haier washer indicates a temperature sensor fault, specifically that the resistance reading from the temperature sensor has deviated more than 2 ohms from the expected specification. The temperature sensor (also called a thermistor) monitors water temperature during the wash and rinse cycles, feeding real-time data to the control board so it can regulate heating and cycle timing accurately. When the control board detects a resistance value outside the acceptable range by more than 2 ohms, it flags the fault and halts normal operation to prevent incorrect temperature-based decisions.

The most common root cause is a poor or broken electrical connection between the sensor and the control board. Connector pins can corrode, loosen, or pull back from their housing due to vibration and moisture exposure inside the washer cabinet. A failed thermistor itself is the next likely cause, where the component's internal resistance has drifted out of specification or failed entirely due to age, heat stress, or water intrusion.

Diagnosing Err3 begins with physically inspecting the temperature sensor wiring harness and connector for secure seating, corrosion, or damaged wires. If the connection appears sound, the thermistor should be tested with a multimeter to verify its resistance output matches the expected value at a known temperature. A reading that deviates beyond the 2-ohm tolerance confirms the sensor needs replacement.

Source: manufacturer service documentation.

Common causes of Err3

  1. 01

    Loose or disconnected wiring connector

    Wiring / connection

    The connector linking the temperature sensor to the control board may have come loose, partially unplugged, or developed a poor contact. This is the first thing to inspect, as it is the most common source of a resistance deviation reading.

  2. 02

    Corroded or damaged connector pins

    Wiring / connection

    Moisture inside the washer cabinet can cause corrosion on the sensor connector pins, increasing resistance in the circuit beyond the 2-ohm tolerance. Inspect the connector carefully for green or white oxidation buildup and bent or pushed-back pins.

  3. 03

    Failed temperature sensor (thermistor)

    Part replacement

    The thermistor itself may have drifted out of its specified resistance range or failed completely due to age, heat cycling, or water exposure. Testing the sensor with a multimeter at a known temperature will confirm whether the component is faulty.

  4. 04

    Damaged wiring harness

    Part replacement

    The wire harness running from the temperature sensor to the control board may have a broken conductor, pinched insulation, or a short caused by rubbing against the drum or cabinet interior. Inspect the full length of the harness for visible damage.

  5. 05

    Control board fault

    Part replacement

    If the sensor and all wiring test within specification but the error persists, the control board's sensor input circuit may be faulty, causing it to misread valid resistance values. This is the least common cause and should only be suspected after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about Err3

What does Err3 mean on a Haier washer?
Err3 on a Haier washer indicates a temperature sensor fault. Specifically, the control board has detected that the resistance value from the temperature sensor has deviated more than 2 ohms from the expected specification. This prevents the washer from accurately monitoring water temperature, which can disrupt heating and cycle completion.
How do I fix Err3 on my Haier washer?
Start by checking that the temperature sensor wiring connector is firmly seated and free of corrosion or damaged pins. If the connection looks secure, use a multimeter to test the thermistor's resistance and compare it against the specified value. A reading that falls outside the 2-ohm tolerance means the sensor should be replaced. If the sensor and wiring both test correctly, the control board may need further inspection.
Is it safe to keep using my Haier washer when Err3 is displayed?
It is not recommended to continue running the washer with Err3 active. Without a functioning temperature sensor, the control board cannot reliably regulate water temperature, which could result in clothes being washed at incorrect temperatures or the cycle not completing properly. Addressing the fault before further use will prevent potential damage to laundry or the appliance.
Will resetting my Haier washer clear the Err3 code?
A reset may temporarily clear the error display, but Err3 will return if the underlying fault with the temperature sensor or its wiring has not been corrected. The control board triggers the code based on a real resistance deviation reading, so the physical cause must be diagnosed and repaired to permanently resolve it.
How much does it cost to repair a Haier washer Err3 error?
If the issue is simply a loose connector, there may be no parts cost at all. Replacing a faulty temperature sensor is generally an affordable repair, with parts typically ranging from $15 to $50 depending on the specific model. If the control board is found to be at fault, repair costs will be higher, generally falling in the range of $100 to $300 for parts and labor.

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