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Error code reference

Dacor Oven Error Code U35

Upper/single oven temp sensor shorted probe 3

Dacor codesDacor oven codes

Upper/single oven temp sensor shorted probe 3 - A/D value of 0X0010 or lower registered for 60 continuous seconds.

First step from the service manual

Verify connections at relay board. Verify probe state at probe connector. Secure connection, replace probe, or replace harness.

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

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What U35 means on a Dacor oven

The U35 error code on a Dacor oven indicates that the upper or single oven temperature sensor (probe 3) has registered a shorted condition. Specifically, the analog-to-digital converter on the relay board has detected a value of 0x0010 or lower continuously for 60 seconds or more. This threshold represents an extremely low resistance reading at the probe input, which corresponds to a short circuit rather than a normal temperature-sensing resistance. Under normal operating conditions, the temperature probe presents a predictable resistance that varies with oven cavity temperature, and values this low fall outside any realistic operating range.

The temperature probe in this context is a resistive sensor, typically a platinum RTD or similar element, whose resistance the control board reads and converts to a temperature value. When the A/D value collapses to 0x0010 or below, the board interprets this as a shorted probe circuit. The fault can originate at the probe itself, at the wiring harness connecting the probe to the relay board, or at the connector terminals on the relay board. A short can develop from pinched or melted wiring inside the oven cavity, corroded or bridged connector pins, or internal failure of the probe element.

Diagnosis begins at the relay board by visually inspecting the probe connector for signs of heat damage, corrosion, or pin contact bridging. The probe should then be tested directly at its connector to determine whether the short is internal to the probe or present in the harness. If the harness and connectors appear intact and the short resolves when the probe is disconnected, the probe itself is the most likely failed component. If the short persists with the probe disconnected, inspect the harness for damage along its entire run through the oven cavity.

Source: manufacturer service documentation.

Common causes of U35

  1. 01

    Failed temperature probe (internal short)

    Part replacement

    The probe element itself can develop an internal short circuit, causing the resistance to drop to near-zero and triggering the 0x0010 A/D threshold. Disconnect the probe at its connector and measure resistance across the probe terminals to confirm.

  2. 02

    Damaged or pinched wiring harness

    Part replacement

    The harness running from the probe to the relay board can be pinched by oven components, melted by heat exposure, or abraded over time, creating a short between conductors. Inspect the full harness run for visible damage or insulation breakdown.

  3. 03

    Loose or corroded probe connector

    Wiring / connection

    Corrosion or debris bridging the pins inside the probe connector at the relay board can create a false short circuit reading. Inspect the connector closely and clean or reseat it to rule this out before replacing components.

  4. 04

    Relay board connector seating issue

    Wiring / connection

    A poorly seated probe connector at the relay board can produce inconsistent or erroneous A/D readings. Firmly reseat the connector and confirm it is fully locked before further diagnosis.

  5. 05

    Relay board fault

    Part replacement

    If the probe and harness both test normal when isolated, the relay board input circuit itself may have failed, causing it to register falsely low A/D values. Board replacement would be required in this scenario.

See the test procedure for each cause

Frequently asked questions about U35

What does U35 mean on a Dacor oven?
U35 indicates that the upper or single oven temperature probe 3 has registered a shorted circuit condition. The relay board's analog-to-digital converter detected a value of 0x0010 or lower for 60 continuous seconds, which is outside the normal range for any valid oven temperature. The oven displays this code to prevent operation under conditions where accurate temperature measurement is not possible.
Can I fix the U35 error myself?
Some causes of U35 can be addressed without professional help, such as reseating the probe connector at the relay board or visually inspecting the harness for obvious damage. However, if the probe itself has failed or the harness needs replacement, those repairs involve working near high-voltage components inside the oven and require comfort with appliance disassembly. If you are unsure, contacting a qualified appliance technician is the safer choice.
Is it safe to use my Dacor oven while the U35 code is showing?
No. The U35 code means the oven cannot reliably read the cavity temperature, so the control system cannot regulate heat correctly. Operating the oven in this condition creates a risk of overheating. The oven should remain off until the probe, harness, or connector issue is diagnosed and corrected.
Will resetting the oven clear the U35 error code?
A power reset may temporarily clear the code from the display, but U35 will return if the underlying short circuit condition is still present at the probe or harness. Because the fault must persist for 60 continuous seconds before triggering, it may not reappear immediately after a reset, but the root cause must be repaired for the code to stay clear.
How much does it cost to repair a U35 error on a Dacor oven?
Repair costs depend on which component has failed. A replacement temperature probe typically falls in the range of $30 to $100 for the part, while a wiring harness can range from $40 to $150 depending on the model. Relay board replacement, if required, is generally the most expensive option and can range from $150 to $400 or more. Adding professional labor costs will increase these estimates, generally by $75 to $150 per hour depending on your area.

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