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Error code reference

Whirlpool Ice Maker Error Code On/Off LED blinking

Bin thermistor failure

Whirlpool codesWhirlpool ice maker codes

Bin thermistor failure — the bin thermistor is open or shorted, or not plugged into the control box.

First step from the service manual

Check that the bin thermistor is plugged in to the control box. Check that the bin thermistor is not open or shorted. Replace the thermistor if it is open or short.

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

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What On/Off LED blinking means on a Whirlpool ice maker

The On/Off LED blinking on a Whirlpool ice maker signals a bin thermistor failure. The bin thermistor is a temperature-sensing resistor that monitors the ice level in the storage bin by detecting cold temperatures when ice is present. The control box uses this signal to determine when to start or stop ice production. When the control detects that the thermistor circuit is open, shorted, or completely disconnected, it halts normal operation and triggers this blinking alert.

An open thermistor means the resistance in the sensor circuit has gone to infinity, indicating a broken or severed electrical path. A shorted thermistor means resistance has dropped to near zero, indicating an internal component failure. Either condition produces an invalid temperature reading that the control box cannot use for accurate bin-level decisions. A loose or disconnected connector at the control box produces the same fault condition, even if the thermistor itself is fully functional.

Diagnosing this code begins with a physical inspection of the thermistor connector at the control box, ensuring it is fully seated. If the connection is secure, the thermistor itself should be tested with a multimeter. A thermistor that reads infinite resistance is open and must be replaced. A thermistor that reads zero or near-zero resistance is shorted and must also be replaced. If resistance reads within a plausible range for the ambient temperature, the wiring harness between the thermistor and control box should be inspected for damage.

Source: manufacturer service documentation.

Common causes of On/Off LED blinking

  1. 01

    Disconnected thermistor connector

    Wiring / connection

    The bin thermistor connector may have come loose or pulled out of the control box. This is the first thing to check, as a disconnected plug produces the same fault as a failed sensor.

  2. 02

    Open bin thermistor

    Part replacement

    The thermistor's internal resistance element has broken, causing an open circuit. This reads as infinite resistance on a multimeter and requires thermistor replacement.

  3. 03

    Shorted bin thermistor

    Part replacement

    The thermistor has internally short-circuited, dropping resistance to near zero. A multimeter reading at or near zero ohms across the thermistor terminals confirms this failure, and the thermistor must be replaced.

  4. 04

    Damaged wiring harness

    Part replacement

    The wire harness running between the bin thermistor and the control box may have chafed, pinched, or corroded connections that create an intermittent or permanent open or short circuit. Inspect the full length of the harness for visible damage.

  5. 05

    Faulty control box

    Part replacement

    If the thermistor and wiring both test correctly, the control box itself may have a defective thermistor input circuit. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about On/Off LED blinking

What does On/Off LED blinking mean on a Whirlpool ice_maker?
The blinking On/Off LED on a Whirlpool ice maker indicates a bin thermistor failure. The control box has detected that the bin thermistor circuit is either open, shorted, or not connected. The ice maker will not produce ice while this fault is active. Resolving the issue requires inspecting the thermistor connection and testing or replacing the sensor as needed.
How do I fix the blinking On/Off light on my Whirlpool ice maker?
Start by checking that the bin thermistor connector is fully plugged into the control box. If it is seated correctly, use a multimeter to test the thermistor's resistance. A reading of infinite resistance indicates an open thermistor, and a reading near zero indicates a shorted thermistor. In either case, replace the bin thermistor to clear the fault.
Will resetting the ice maker clear the blinking On/Off LED error?
A reset will not permanently clear this error if the underlying thermistor problem is still present. The control box will detect the open or shorted circuit again and reactivate the fault indicator. The root cause, whether a loose connector, a failed thermistor, or damaged wiring, must be corrected before the error clears and stays clear.
Is it safe to keep using my Whirlpool ice maker when the On/Off LED is blinking?
The ice maker is designed to stop ice production when this fault is detected, so it will not be operating normally. Continuing to use it in this state is not productive since no ice will be made. There is no immediate safety hazard from the thermistor fault itself, but the appliance should be serviced to restore proper operation.
How much does it cost to fix a bin thermistor fault on a Whirlpool ice maker?
If the fix is simply reseating a loose connector, there is no parts cost involved. If the bin thermistor itself has failed and needs replacement, parts typically range from around $15 to $50 depending on the model. If professional service is required, total repair costs including labor can range from $75 to $200 or more depending on your location and service provider.

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