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Error code reference

Dacor Range Error Code F31

Open temperature sensor or open temperature sensor wiring.

Dacor codesDacor range codes

Open temperature sensor or open temperature sensor wiring.

First step from the service manual

Replace sensor or replace sensor wiring.

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

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What F31 means on a Dacor range

The F31 error code on a Dacor range indicates an open circuit condition in the oven temperature sensor or its associated wiring harness. The temperature sensor, typically a resistance temperature detector (RTD), is responsible for continuously monitoring the oven cavity temperature and reporting that data to the control board. When the control board detects an open circuit rather than a valid resistance reading from the sensor, it triggers the F31 fault and halts normal oven operation to prevent unsafe heating conditions.

An open circuit in this context means the electrical path between the sensor and the control board is broken. This can occur either within the sensor probe itself or anywhere along the wiring that connects it to the control board. A functioning oven RTD sensor typically presents a measurable resistance value that changes predictably with temperature. If the control board reads an infinite or out-of-range resistance value, it interprets this as an open sensor and throws the F31 code.

The most direct diagnostic approach is to disconnect the sensor from the wiring harness and measure the sensor's resistance with a multimeter at room temperature. If the sensor reads open (infinite resistance), it has failed internally and must be replaced. If the sensor reads correctly, the fault lies in the wiring harness, which should be inspected for breaks, burns, or disconnected connectors between the sensor and the control board. Either the sensor or the wiring harness will need to be replaced to resolve the fault.

Source: manufacturer service documentation.

Common causes of F31

  1. 01

    Failed temperature sensor probe

    Part replacement

    The RTD sensor probe inside the oven cavity can fail internally, breaking the circuit entirely. This is the most common cause and can be confirmed by measuring the sensor's resistance with a multimeter and finding an open or infinite reading.

  2. 02

    Broken or damaged wiring harness

    Part replacement

    The wiring that runs from the temperature sensor to the control board can break, fray, or burn over time due to heat exposure. Visually inspecting the harness for damage or measuring continuity along the wires will identify this issue.

  3. 03

    Loose or corroded sensor connector

    Wiring / connection

    The connector joining the sensor wiring to the control board or the sensor itself can loosen or corrode, creating an intermittent or permanent open circuit. Check that all connectors are fully seated and free of corrosion.

  4. 04

    Sensor pulled from mounting position

    Wiring / connection

    If the sensor probe has shifted or been pulled partially out of its mounting bracket inside the oven, the connector can loosen and break continuity. Inspect the sensor's position and reattach or reseat it if needed.

See the test procedure for each cause

Frequently asked questions about F31

What does F31 mean on a Dacor range?
F31 on a Dacor range indicates an open circuit in the oven temperature sensor or its wiring. The control board cannot detect a valid resistance reading from the sensor, which signals a broken electrical path. The fault points to either a failed sensor probe or a break somewhere in the wiring connecting it to the control board. Normal oven operation is disabled until the issue is resolved.
Can I fix the F31 error myself?
Many technicians and knowledgeable DIYers can resolve an F31 error by testing and replacing the temperature sensor or inspecting the wiring harness for damage. Start by using a multimeter to check the resistance of the sensor probe after disconnecting it from the harness. If the sensor reads open, replacing it is a straightforward repair. If the sensor reads correctly, trace and repair or replace the damaged wiring section.
Will resetting the range clear the F31 error code?
Resetting the range by cutting power at the breaker may temporarily clear the F31 code, but it will return as soon as the control board attempts to read the sensor again. Because F31 is caused by a physical open circuit in the sensor or its wiring, the underlying hardware problem must be corrected before the fault will stay cleared.
Is it safe to use my Dacor range while it shows F31?
It is not recommended to continue using the oven while the F31 code is active. The control board cannot monitor oven temperature accurately without a functioning sensor, which means it cannot regulate heating safely. Operating the oven in this condition could result in overheating or unpredictable behavior. The fault should be diagnosed and repaired before resuming normal use.
How much does it cost to fix an F31 error on a Dacor range?
If only the temperature sensor probe needs to be replaced, parts typically run in the range of $30 to $80, with labor adding $100 to $200 if a technician is hired. If the wiring harness is damaged, repair costs can vary depending on whether a full harness or individual wires need replacement. A full service call for this type of repair generally falls in the range of $150 to $350 depending on location and the specific parts required.

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