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Error code reference

Viking Range Error Code 2 flashes then 4 seconds OFF (cycle light)

RTD (Oven Probe) error.

Viking codesViking range codes

RTD (Oven Probe) error.

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What 2 flashes then 4 seconds OFF (cycle light) means on a Viking range

The 2-flash cycle light pattern on a Viking range signals an RTD (Resistance Temperature Detector) probe error. The RTD probe is a temperature-sensing component located inside the oven cavity that measures internal temperature by changing its electrical resistance in response to heat. The control board reads this resistance value to regulate oven temperature accurately. When the board detects a resistance reading that falls outside the expected operating range, either too high or too low, it triggers this fault code to alert the technician that the temperature sensing circuit has a problem.

The most common sources of this fault are a failed RTD probe itself, damaged wiring between the probe and the control board, or a faulty connection at either end of the circuit. RTD probes used in Viking ranges typically produce a resistance value near 1,000 ohms at room temperature, and that value rises predictably as temperature increases. A reading that is shorted to near zero ohms or open at very high resistance indicates a probe or wiring failure. Corrosion, physical damage from high heat, or a loose connector at the board or probe terminals can all produce an out-of-range signal.

In less common cases, the oven control board itself may be the source of the fault, misreading an otherwise functional probe circuit due to an internal component failure. Before replacing the board, technicians should always confirm probe resistance with a multimeter and inspect the full wiring harness for continuity and visible damage. Replacing a known-good board without testing the probe first is a common and costly diagnostic error.

Source: manufacturer service documentation.

Common causes of 2 flashes then 4 seconds OFF (cycle light)

  1. 01

    Failed RTD Oven Probe

    Part replacement

    The RTD probe itself has failed internally, producing a resistance reading outside the normal operating range. Testing the probe with a multimeter at room temperature should show approximately 1,000 ohms; a reading near zero or an open circuit confirms probe failure.

  2. 02

    Damaged or Broken Probe Wiring

    Part replacement

    The wiring harness connecting the RTD probe to the control board can develop breaks, burns, or shorts, especially near the back wall of the oven cavity where heat exposure is high. Inspect the full length of the wiring for visible damage and test continuity through each wire.

  3. 03

    Loose or Corroded Probe Connector

    Wiring / connection

    A loose or corroded connector at either the probe terminal or the control board plug can interrupt the resistance signal without fully breaking the wire. Unplugging and reseating connectors, and inspecting for corrosion or burned terminals, can confirm this cause.

  4. 04

    Probe Physically Damaged Inside Oven Cavity

    Part replacement

    Physical impact from pans or racks, or extended exposure to extreme heat during a self-clean cycle, can crack or deform the probe tip. Visually inspect the probe inside the oven for bent, cracked, or burnt damage.

  5. 05

    Faulty Oven Control Board

    Part replacement

    If the RTD probe and all wiring test within normal specifications, the control board may be misinterpreting the resistance signal due to an internal board failure. This is the least common cause and should only be considered after ruling out the probe and wiring circuit.

See the test procedure for each cause

Frequently asked questions about 2 flashes then 4 seconds OFF (cycle light)

What does 2 flashes then 4 seconds OFF (cycle light) mean on a Viking range?
This flash pattern indicates an RTD oven probe error. The RTD probe is the temperature sensor inside the oven cavity that the control board uses to monitor and regulate heat. When the board receives a resistance reading outside the expected range, it triggers this fault and interrupts normal oven operation. The problem is most often a failed probe, damaged wiring, or a loose connector.
Can I fix the 2-flash RTD error on my Viking range myself?
A knowledgeable DIYer can test the RTD probe with a multimeter and replace it if the reading is out of range. The probe is typically accessible inside the oven cavity and secured with one or two screws. However, if the probe tests correctly and wiring or control board diagnosis is needed, professional service is recommended to avoid misdiagnosis and unnecessary parts costs.
Is it safe to use my Viking range while the 2-flash error is active?
No, you should not use the oven while this fault is present. Without a functioning temperature sensor, the control board cannot accurately regulate oven heat, which creates a risk of significant overheating or unpredictable temperature behavior. The oven should remain out of service until the RTD probe circuit is repaired and the error is cleared.
Will resetting my Viking range clear the 2-flash error code?
A power reset by unplugging the range or switching off the circuit breaker for a few minutes may temporarily clear the fault display, but the error will return as soon as the control board reads the faulty probe circuit again during the next oven cycle. A reset does not repair the underlying hardware problem and should not be relied on as a fix.
How much does it cost to repair the RTD probe error on a Viking range?
Repair costs vary depending on whether the probe, wiring, or control board needs replacement. An RTD probe replacement is typically the least expensive repair, with parts generally ranging from $30 to $100 and professional labor adding $100 to $200 or more depending on your area. A control board replacement, if required, is significantly more costly, with parts alone often ranging from $200 to $500 or higher for Viking models.

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