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Error code reference

KitchenAid Ice Maker Error Code LED flashing 1/2 second intervals

Harvest failure mode

KitchenAid codesKitchenAid ice maker codes

Harvest failure mode - evaporator thermistor has not reached 52°F during harvest cycle lasting more than 16 minutes, possibly due to loose/improperly positioned thermistor, hot gas valve failure, sealed system leak, or restriction.

First step from the service manual

Check evaporator thermistor positioning, hot gas valve operation, and sealed system for leaks or restrictions. Shut unit off and back on to reset control board, then find and correct cause of failure.

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

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What LED flashing 1/2 second intervals means on a KitchenAid ice maker

The LED flashing at 1/2 second intervals on a KitchenAid ice maker signals a harvest failure mode. This condition is triggered when the evaporator thermistor fails to reach 52°F during a harvest cycle that has exceeded 16 minutes. The harvest cycle is the phase where the ice maker warms the evaporator plate just enough to release formed ice cubes. The control board monitors the thermistor reading throughout this cycle, and if the temperature threshold is not reached within the allowed window, the board flags the failure and enters this alert state.

The evaporator thermistor is the primary sensor involved in this fault. If the thermistor is loose or improperly positioned against the evaporator, it will read inaccurate temperatures and cause a false harvest failure even when the evaporator is actually warming correctly. Beyond sensor positioning, the hot gas valve plays a critical role: this valve directs hot refrigerant gas from the compressor discharge line to the evaporator to warm it during harvest. A failed or stuck hot gas valve means insufficient heat reaches the evaporator, extending or preventing a successful harvest cycle.

Sealed system issues are also a root cause to consider. A refrigerant leak reduces the system's capacity to both freeze and harvest ice efficiently. A restriction in the refrigerant circuit, such as a blocked filter drier or a partially restricted metering device, similarly degrades system performance and can prevent the evaporator from reaching the required 52°F harvest temperature. Diagnosing this fault requires a methodical check of thermistor placement, valve operation, and refrigerant circuit integrity before replacing any components.

Source: manufacturer service documentation.

Common causes of LED flashing 1/2 second intervals

  1. 01

    Loose or mispositioned evaporator thermistor

    Wiring / connection

    If the thermistor is not properly secured against the evaporator surface, it reads incorrect temperatures and falsely triggers the harvest failure alert. Inspect the thermistor clip or mount and confirm the sensor is in full contact with the evaporator at the correct location.

  2. 02

    Hot gas valve failure

    Part replacement

    The hot gas valve directs warm refrigerant to the evaporator during harvest to loosen the ice. If this valve is stuck closed or fails to open, the evaporator cannot warm to 52°F within the 16-minute window. Testing the valve for electrical continuity and proper actuation will confirm whether it needs replacement.

  3. 03

    Refrigerant leak in the sealed system

    Part replacement

    A refrigerant leak reduces system capacity, preventing the evaporator from reaching the required harvest temperature. Signs include reduced ice production prior to the fault, frost patterns that appear abnormal, or a longer-than-usual freeze cycle before the harvest failure occurs.

  4. 04

    Restriction in the sealed system

    Part replacement

    A blocked filter drier or restricted metering device limits refrigerant flow and disrupts both the freeze and harvest phases. This is typically identified through pressure testing and temperature readings at various points in the refrigerant circuit.

See the test procedure for each cause

Frequently asked questions about LED flashing 1/2 second intervals

What does LED flashing 1/2 second intervals mean on a KitchenAid ice_maker?
This rapid LED flash pattern indicates a harvest failure mode. The control board detected that the evaporator thermistor did not reach 52°F during a harvest cycle that ran for more than 16 minutes. The cause can be a mispositioned thermistor, a failed hot gas valve, a refrigerant leak, or a restriction in the sealed system. The unit needs to be inspected and the root cause corrected before normal operation resumes.
Will resetting the KitchenAid ice maker clear the LED flashing error?
Turning the unit off and back on will reset the control board and clear the active fault, allowing the ice maker to attempt another cycle. However, if the underlying problem is not corrected, the harvest failure will recur and the LED will begin flashing again. A reset is a useful first step for diagnosis, but it is not a fix on its own.
Can I fix the LED flashing harvest failure error myself?
Some causes are DIY-friendly, particularly checking and repositioning the evaporator thermistor, which requires no special tools or refrigerant handling certification. However, diagnosing and repairing the hot gas valve or any sealed system issue involving refrigerant requires EPA Section 608 certification and specialized equipment. Attempting sealed system repairs without proper training can be unsafe and may make the problem worse.
Is it safe to keep using my KitchenAid ice maker while the LED is flashing?
The unit should not be left running in a harvest failure state. When the control board enters this mode, the ice maker is not completing its cycles properly, meaning ice production has stopped or is unreliable. Continuing to run the unit without addressing the fault can put additional stress on the compressor and sealed system components. Shut the unit off until the cause is identified and corrected.
How much does it cost to repair a KitchenAid ice maker showing a harvest failure error?
Repair costs vary significantly depending on the cause. Repositioning the thermistor may cost nothing if you do it yourself, or a modest service call fee if a technician handles it. Replacing the hot gas valve typically runs in the range of $150 to $350 including parts and labor. Sealed system repairs such as fixing a refrigerant leak or clearing a restriction are more involved and can range from $300 to $600 or more depending on the extent of the work and local labor rates.

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