mypros+
Error code reference

Viking Ice Maker Error Code 3 blinks

Evaporator sensor is open or shorted (thermistor failure)

Viking codesViking ice maker codes

Evaporator sensor is open or shorted (thermistor failure). Also indicated as bin sensor open or shorted in one reference.

First step from the service manual

Disconnect and remove evaporator thermistor, measure resistance across wire leads and compare to Resistance versus Temperature Chart.

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

MyPros+ Max

Get the full diagnostic procedure for 3 blinks.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 3 blinks means on a Viking ice maker

The 3 blinks error code on a Viking ice maker indicates a fault with the evaporator thermistor, a temperature-sensing resistor mounted on or near the evaporator that continuously reports thermal conditions to the control board. When the control board detects that the thermistor circuit is either open (broken connection, infinite resistance) or shorted (resistance collapsed near zero), it halts the ice-making cycle and triggers this blink sequence. Some references also associate this code with the bin thermistor, which monitors ice accumulation levels in the storage bin. Either sensor failing will produce the same three-blink fault signal.

Thermistors are NTC (negative temperature coefficient) devices, meaning their resistance decreases predictably as temperature rises. A properly functioning evaporator thermistor will display a specific resistance value at any given temperature, and comparing a measured reading against the Resistance versus Temperature Chart for the unit will confirm whether the component is within specification. Readings of infinite resistance indicate an open circuit, typically caused by a broken internal element or severed wire. Readings near zero ohms indicate a short, often from insulation breakdown or moisture intrusion into the sensor body or connector.

Common contributors to thermistor failure include physical damage to the sensor leads, corrosion at the connector pins from condensation exposure, and age-related degradation of the thermistor element itself. In some cases, the wiring harness between the sensor and the control board is the actual failure point rather than the sensor body. Because the ice maker will not operate normally while this fault is active, accurate resistance measurement during diagnosis is essential before replacing any components.

Source: manufacturer service documentation.

Common causes of 3 blinks

  1. 01

    Failed evaporator thermistor

    Part replacement

    The thermistor element itself has degraded or broken internally, producing an open or shorted resistance reading when measured across its leads. This is confirmed by comparing the measured resistance to the Resistance versus Temperature Chart and finding the value is out of range.

  2. 02

    Damaged or broken thermistor wiring

    Part replacement

    The wire leads running from the thermistor to the control board may be pinched, cut, or corroded, creating an open or intermittent circuit even if the sensor body is intact. Visually inspect the full length of the harness for signs of wear, kinking, or connector corrosion.

  3. 03

    Corroded or loose connector pins

    Wiring / connection

    Moisture and condensation inside the ice maker can corrode the connector terminals where the thermistor plugs into the wiring harness, increasing resistance or breaking contact entirely. Cleaning or re-seating the connector may resolve the fault if the thermistor itself tests within spec.

  4. 04

    Failed bin sensor

    Part replacement

    One reference associates this same 3-blink code with the bin thermistor that detects ice level in the storage compartment. If the evaporator thermistor tests correctly, the bin sensor should also be disconnected and measured to rule out this component as the source of the fault.

  5. 05

    Control board misreading sensor signal

    Part replacement

    In rare cases, the control board itself may be interpreting a normal sensor signal as an open or short due to a board-level fault. This should only be considered after the thermistor and all associated wiring have been confirmed good through resistance testing.

See the test procedure for each cause

Frequently asked questions about 3 blinks

What does 3 blinks mean on a Viking ice maker?
Three blinks on a Viking ice maker indicates that the control board has detected an open or shorted evaporator thermistor circuit. The thermistor is a temperature-sensing resistor that monitors the evaporator temperature during the ice-making cycle. Some references also link this code to a bin sensor fault. The ice maker will not operate normally until the fault is resolved.
How do I fix the 3 blinks error on my Viking ice maker?
Start by disconnecting the evaporator thermistor and measuring the resistance across its wire leads with a multimeter. Compare that reading to the Resistance versus Temperature Chart for your unit to determine if the sensor is within specification. If the resistance is infinite or near zero, the thermistor needs to be replaced. Also inspect the wiring harness and connector pins for damage or corrosion before assuming the sensor itself is faulty.
Will resetting the ice maker clear the 3 blinks error?
A reset may temporarily clear the blink sequence, but the error will return if the underlying thermistor fault is still present. Because the control board actively monitors the sensor circuit during operation, it will detect the open or short condition again and re-trigger the fault code. The thermistor or its wiring must be repaired or replaced to permanently resolve the issue.
Is it safe to continue using my Viking ice maker when it shows 3 blinks?
The ice maker is designed to halt normal operation when this fault is active, so it will not be producing ice in most cases. Continuing to run the unit without addressing the sensor fault is not recommended, as the control board relies on thermistor data to regulate the freeze and harvest cycles safely. Resolving the fault before resuming use is the correct approach.
How much does it cost to fix a 3 blinks error on a Viking ice maker?
If the evaporator or bin thermistor is the only failed component, parts costs are generally modest, typically in the range of $20 to $80 depending on the specific sensor required. If a professional technician is needed for diagnosis and replacement, labor costs will add to that total and can vary significantly by region. In the less common scenario where the control board is also involved, repair costs will be considerably higher.

Related Viking ice maker codes

All Viking ice maker codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass