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Error code reference

Viking Range Error Code 2 flashes then 4 seconds OFF

RTD (Oven Probe) error displayed on cycle light on control panel.

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RTD (Oven Probe) error displayed on cycle light on control panel.

First step from the service manual

Check RTD resistance and wiring.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What 2 flashes then 4 seconds OFF means on a Viking range

The 2 flashes then 4 seconds OFF error on a Viking range signals an RTD (Resistance Temperature Detector) probe fault. The RTD is a temperature-sensing element located inside the oven cavity that monitors cooking temperatures and feeds that data back to the control board. The control board continuously reads the RTD's resistance value to determine oven temperature. When the resistance reading falls outside the expected range, either too high or too low, the board registers a fault and communicates it through the cycle light on the control panel using the 2-flash pattern.

The RTD probe operates on a predictable resistance curve. At room temperature (approximately 70°F), a properly functioning RTD should measure around 1080 to 1100 ohms. As oven temperature increases, resistance rises proportionally. If the control board receives a resistance signal that is shorted (very low resistance), open (infinite resistance), or simply out of specification, it cannot accurately regulate the oven and triggers this error to prevent unsafe or inaccurate operation.

The most common causes involve either a failed RTD probe itself or a wiring issue between the probe and the control board. The probe connector can loosen or corrode over time, and the wire harness running along the oven cavity can sustain heat damage. A thorough diagnostic begins with disconnecting the RTD and measuring its resistance with a multimeter at the probe terminals. If resistance is correct, the investigation shifts to the wiring and connectors before considering control board replacement.

Source: manufacturer service documentation.

Common causes of 2 flashes then 4 seconds OFF

  1. 01

    Failed RTD Probe

    Part replacement

    The RTD probe itself has failed internally, producing a resistance reading that is open, shorted, or out of the normal specification range. Disconnect the probe and measure resistance with a multimeter; a reading far outside 1080 to 1100 ohms at room temperature confirms probe failure.

  2. 02

    Loose or Corroded RTD Connector

    Wiring / connection

    The connector joining the RTD probe to the wire harness can loosen or corrode, creating an intermittent or open circuit. Inspect the connector for corrosion, melting, or poor seating and clean or reseat it as needed.

  3. 03

    Damaged RTD Wiring Harness

    Part replacement

    The wires running from the RTD probe to the control board are routed near the oven cavity and can sustain heat damage or chafing over time. Visually inspect the harness for burnt insulation, breaks, or pinched sections and test for continuity.

  4. 04

    RTD Probe Physically Damaged

    Part replacement

    Physical impact, heavy cleaning, or oven rack contact can bend or crack the probe tip, causing an internal break in the sensing element. Inspect the probe for visible deformation or damage at the tip and along its shaft.

  5. 05

    Faulty Control Board

    Part replacement

    If the RTD probe resistance measures correctly and all wiring checks out, the control board's RTD input circuit may have failed and is misreading an otherwise good signal. 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 2 flashes then 4 seconds OFF

What does 2 flashes then 4 seconds OFF mean on a Viking range?
This flash pattern indicates an RTD probe error, meaning the oven's temperature sensor is sending a resistance reading that falls outside acceptable limits. The RTD probe is located inside the oven cavity and is responsible for monitoring cooking temperature. The control board cannot safely regulate oven heat without a valid sensor signal, so it displays this fault code through the cycle light on the control panel.
Can I fix the 2 flashes then 4 seconds OFF error myself on a Viking range?
A knowledgeable DIYer can perform the initial diagnostics, including checking the RTD probe resistance with a multimeter and inspecting wiring and connectors for damage or corrosion. Replacing the RTD probe is also a relatively straightforward repair involving removing a retaining bracket inside the oven cavity and unplugging the connector. However, if the wiring harness or control board needs replacement, professional service is recommended to ensure correct installation and safety.
Is it safe to use my Viking range when this error code is showing?
It is not recommended to operate the oven while this fault is active. The error indicates the control board cannot accurately read oven temperature, which means it may overheat or fail to reach the correct temperature without any reliable feedback. Continuing to use the oven in this condition could pose a safety risk and may cause additional component damage.
How much does it cost to repair the 2 flashes then 4 seconds OFF error on a Viking range?
Repair costs vary depending on the failed component. An RTD probe replacement typically involves parts costs in the range of $30 to $80, plus labor if a technician is hired. If the control board is the cause, parts alone can range from $150 to $400 or more, with additional labor costs on top. Getting a diagnostic visit from a certified technician will provide a more accurate estimate for your specific situation.
Will resetting my Viking range clear the 2 flashes then 4 seconds OFF error?
Power cycling the range by unplugging it or turning off the circuit breaker for a few minutes may temporarily clear the error, but it will return if the underlying RTD probe or wiring fault has not been resolved. A reset does not fix the hardware issue causing the fault. The error will persist or reappear until the faulty component is repaired or replaced.

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