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Error code reference

Haier Refrigerator Error Code 2nd LED Freezer flash

Defrost sensor (D SNR) error

Haier codesHaier refrigerator codes

Defrost sensor (D SNR) error – sensor located above freezer evaporator has failed or is out of range.

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What 2nd LED Freezer flash means on a Haier refrigerator

The 2nd LED Freezer flash on a Haier refrigerator indicates a defrost sensor (D SNR) error. This sensor is a thermistor located above the freezer evaporator coil, and its primary function is to monitor the temperature of the evaporator during the defrost cycle. The refrigerator's control board reads the resistance of this thermistor to determine when the evaporator has reached the target defrost termination temperature. When the sensor signal is absent, shorted, or falls outside the expected resistance range, the control board flags the fault and signals the error via the 2nd LED flash pattern on the freezer indicator.

The defrost sensor plays a critical role in preventing the evaporator from overheating during a defrost cycle and ensuring the heater shuts off at the correct temperature. If the sensor fails open, the board receives no signal and cannot safely complete defrost cycles, which can lead to ice buildup on the evaporator coil over time. If the sensor fails short, it may cause premature termination of the defrost cycle or continuous fault signaling. Either condition disrupts the refrigerator's ability to maintain proper cooling performance.

Common root causes include a thermistor that has drifted out of its calibrated resistance range due to age or moisture exposure, a wiring harness that has developed an open or short circuit between the sensor and the control board, or a connector that has corroded or pulled loose from vibration. Physical damage to the sensor from ice buildup or improper defrost procedures can also cause this fault. Diagnosing the issue typically involves measuring the sensor's resistance and comparing it to the expected specification for the operating temperature range.

Source: manufacturer service documentation.

Common causes of 2nd LED Freezer flash

  1. 01

    Failed defrost thermistor

    Part replacement

    The thermistor itself has failed open or short, or its resistance has drifted outside the acceptable range for its temperature. This is the most frequent cause and requires measuring the sensor's resistance with a multimeter to confirm.

  2. 02

    Damaged or broken wiring harness

    Wiring / connection

    The wiring between the defrost sensor and the control board may have developed an open circuit or a short, often due to ice formation, rodent damage, or repeated flexing over time. Visually inspect the wires and test continuity along the harness.

  3. 03

    Loose or corroded connector

    Wiring / connection

    The sensor connector at either the sensor end or the control board end may have pulled loose or corroded, interrupting the signal. Inspecting and reseating or cleaning the connector can resolve this without replacing parts.

  4. 04

    Ice damage to sensor or mounting location

    Part replacement

    Excessive ice buildup on the evaporator can physically damage the sensor or its leads, especially if a manual defrost was performed improperly using sharp tools. Inspect the sensor body and leads for cracks or breaks after fully defrosting the evaporator.

  5. 05

    Faulty control board

    Part replacement

    If the sensor and wiring both test within specification, the control board may be misreading the sensor signal due to a failed input circuit. This is the least common cause and should only be considered after the sensor and wiring are ruled out.

See the test procedure for each cause

Frequently asked questions about 2nd LED Freezer flash

What does 2nd LED Freezer flash mean on a Haier refrigerator?
The 2nd LED Freezer flash on a Haier refrigerator indicates a defrost sensor (D SNR) error. The sensor is a thermistor positioned above the freezer evaporator coil, and it monitors temperature during the defrost cycle. When the control board detects that the sensor signal is missing or outside its expected range, it triggers this fault code. The refrigerator cannot reliably complete defrost cycles while this error is active.
Can I fix the 2nd LED Freezer flash error myself?
A knowledgeable DIYer can attempt diagnosis by inspecting the sensor wiring, reseating connectors, and testing the thermistor's resistance with a multimeter. If the sensor has failed, replacing the defrost thermistor is a relatively straightforward repair that involves accessing the freezer evaporator panel. However, if the wiring or control board is involved, the repair becomes more complex and a qualified technician may be needed.
Is it safe to keep using my Haier refrigerator when this error is showing?
Continuing to run the refrigerator with this error active is not recommended for extended periods. Without a working defrost sensor, the refrigerator cannot properly control its defrost cycle, which can lead to ice accumulating on the evaporator coil and a gradual loss of cooling performance. Food safety may be compromised if cooling becomes significantly impaired.
How much does it cost to repair the 2nd LED Freezer flash error on a Haier refrigerator?
If only the defrost thermistor needs replacement, parts typically cost in the range of $10 to $40 depending on the specific model. If a technician is hired, total repair costs including labor generally fall in the range of $100 to $250. Control board replacement, if required, can bring costs considerably higher, often in the $200 to $400 range or more.
Will resetting my Haier refrigerator clear the 2nd LED Freezer flash error?
Unplugging the refrigerator for a few minutes and restoring power may temporarily clear the error display, but the fault will return if the underlying sensor problem has not been resolved. A reset does not repair a failed thermistor, broken wire, or bad connection. Proper diagnosis and repair of the defrost sensor circuit is required to permanently clear this error code.

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