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Error code reference

Viking Range Error Code Cycle 1s ON-1s OFF / Clean OFF

RTD (Oven Probe) error on 30", 36" and 48" RH oven.

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RTD (Oven Probe) error on 30", 36" and 48" RH oven.

First step from the service manual

Check RTD resistance. Replace RTD if open or shorted.

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

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What Cycle 1s ON-1s OFF / Clean OFF means on a Viking range

The Cycle 1s ON-1s OFF / Clean OFF error on Viking 30", 36", and 48" RH series ranges indicates a fault with the RTD oven probe, which is the resistance temperature detector used to monitor oven cavity temperature. The RTD is a sensor that changes its electrical resistance predictably as temperature rises or falls. The control board reads this resistance to determine the oven's actual temperature and regulate the heating elements accordingly. When the board detects that the RTD resistance has fallen outside of expected parameters, it triggers this fault code and disables the clean cycle as a safety measure.

The two most common RTD failure states are an open circuit and a short circuit. An open RTD means the sensor's internal resistance wire has broken, resulting in infinite or unmeasurable resistance. A shorted RTD means the sensor's internal wiring has failed in a way that collapses resistance toward zero. Both conditions give the control board a temperature reading that is impossible or implausible, prompting the fault. Normal RTD resistance at room temperature is typically near 1000 ohms for a standard Pt1000 type probe, and the value should rise gradually and consistently as temperature increases.

Diagnosis begins with disconnecting the RTD probe from the control board and measuring resistance across the probe's terminals with a multimeter. A reading that is open (OL or infinite) or shorted (near zero ohms) confirms probe failure, and replacement is the correct repair. If the probe resistance reads within the expected range, the wiring harness between the probe and the control board should be inspected for damage, corrosion, or loose connections before suspecting the board itself.

Source: manufacturer service documentation.

Common causes of Cycle 1s ON-1s OFF / Clean OFF

  1. 01

    Failed RTD Probe (Open Circuit)

    Part replacement

    The resistance wire inside the RTD probe has broken, causing the circuit to read as open or infinite resistance on a multimeter. This is the most common failure and requires replacing the RTD probe.

  2. 02

    Failed RTD Probe (Short Circuit)

    Part replacement

    Internal insulation breakdown inside the probe causes the resistance to collapse near zero ohms. A multimeter reading near zero across the probe terminals confirms this failure, and the probe must be replaced.

  3. 03

    Damaged RTD Wiring Harness

    Wiring / connection

    The wiring between the RTD probe and the control board can become brittle, burned, or corroded from oven heat exposure, causing intermittent or complete signal loss. Inspect the full length of the harness for visible damage or loose connector pins.

  4. 04

    Loose or Corroded RTD Connector

    Wiring / connection

    The plug connecting the RTD probe to the control board can loosen or corrode over time, creating a poor connection that the board interprets as a probe fault. Disconnecting, inspecting, and reseating the connector can resolve this without part replacement.

  5. 05

    Faulty Control Board

    Part replacement

    If the RTD probe and all wiring test within normal resistance values, the control board's sensor input circuit may have failed and is misreading the probe signal. Board replacement is the appropriate next step only after ruling out the probe and wiring.

See the test procedure for each cause

Frequently asked questions about Cycle 1s ON-1s OFF / Clean OFF

What does Cycle 1s ON-1s OFF / Clean OFF mean on a Viking range?
This error code indicates that the control board has detected a fault with the RTD oven probe, the temperature sensor mounted inside the oven cavity. The blinking pattern signals that the probe is either open or shorted, meaning the board cannot get a valid temperature reading. As a result, the self-clean cycle is disabled until the issue is resolved. The fault applies to Viking RH series ranges in 30", 36", and 48" configurations.
Can I fix this error code myself?
A knowledgeable DIYer can diagnose this fault using a multimeter by disconnecting the RTD probe and measuring its resistance at room temperature. If the probe reads open or shorted, replacing the RTD is a relatively straightforward repair involving removing the old probe from the oven interior and installing a compatible replacement. However, if the probe tests normally and the issue is in the wiring or control board, the repair becomes more complex and may warrant a professional technician.
Is it safe to use my Viking oven while this error code is active?
Because the RTD probe provides the temperature feedback the control board relies on to regulate heat, using the oven in bake or broil mode with a faulty probe means the oven cannot accurately control its temperature. This creates a risk of overheating or undercooking. It is best to avoid using the oven for cooking until the probe fault is diagnosed and repaired.
Will resetting the oven clear this error code?
Resetting the range by cycling power at the circuit breaker may temporarily clear the fault display, but the error will return as soon as the control board attempts to read the RTD probe again. Because the root cause is a physical failure of the probe or its wiring, a reset alone will not resolve the issue. The RTD probe must be tested and replaced if faulty.
How much does it cost to repair this error code on a Viking range?
If only the RTD probe needs replacement, parts typically range from $30 to $100 depending on the specific probe, and professional labor for this repair generally falls in the $100 to $200 range. If the control board is also involved, total repair costs can be higher, often ranging from $300 to $600 or more for parts and labor combined. Getting a diagnostic call from a certified Viking technician will give you a more accurate estimate for your specific model.

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