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Error code reference

Dacor Range Oven Cooktop Error Code U35

Temp sensor (upper/single oven)

Dacor codesDacor range oven cooktop codes

Temp sensor (upper/single oven) - shorted RTD 3, check wiring at connection points.

First step from the service manual

Check wiring at connection points.

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 range oven cooktop

The U35 error code on a Dacor range or oven indicates a shorted RTD (Resistance Temperature Detector) condition on the temperature sensor assigned to the upper or single oven cavity. RTD sensors operate by changing electrical resistance in proportion to temperature. Under normal operating conditions, the sensor produces a predictable resistance value that the control board reads to monitor oven temperature. When the circuit shorts, the resistance drops abnormally low, causing the control board to receive an invalid temperature signal and trigger the U35 fault.

A shorted RTD circuit typically means the sensor probe, the wiring harness, or a connector is allowing current to take an unintended path to ground or to another conductor. This can cause the control board to misread the oven temperature as extremely high or produce an erratic signal, which may prevent the oven from heating or cause it to shut down as a safety measure. The designation RTD 3 refers specifically to the third temperature sensor input on the control board, corresponding to the upper or single oven cavity.

The first and most important diagnostic step is a thorough inspection of the wiring at all connection points between the RTD sensor and the control board. Damaged insulation, pinched wires, corroded terminals, or a connector that has been exposed to heat or moisture can all create a short condition. If wiring checks out, the RTD sensor itself should be tested for resistance. A confirmed short within the sensor body requires sensor replacement, while wiring faults can sometimes be repaired by replacing the affected harness section or connector.

Source: manufacturer service documentation.

Common causes of U35

  1. 01

    Damaged or pinched wiring harness

    Part replacement

    The wiring between the RTD sensor and the control board may be pinched, frayed, or have compromised insulation that allows a short to occur. Inspect the full length of the harness for visible damage, especially near sharp metal edges or heat sources.

  2. 02

    Corroded or loose connector terminals

    Wiring / connection

    Connector terminals at either the sensor end or the control board end can corrode or back out of their housing, causing an unintended electrical contact. Check all connection points for oxidation, moisture intrusion, or loose pins.

  3. 03

    Failed RTD temperature sensor

    Part replacement

    The RTD sensor probe itself may have an internal short, which would produce an out-of-range resistance reading regardless of wiring condition. Testing the sensor resistance directly at the probe leads can confirm whether the sensor has failed.

  4. 04

    Heat damage to wiring insulation

    Part replacement

    Prolonged exposure to high oven cavity temperatures can degrade wire insulation near the sensor, eventually causing two conductors to contact each other and short. Look for discolored, brittle, or melted insulation close to the sensor mounting location.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the control board input circuit for RTD 3 may have failed internally, causing it to incorrectly report a shorted sensor even when the sensor and wiring are intact. This diagnosis should only be considered after the sensor and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about U35

What does U35 mean on a Dacor range, oven, cooktop?
U35 indicates a shorted RTD 3 condition on the temperature sensor for the upper or single oven cavity. The control board has detected an abnormally low resistance in the sensor circuit, which prevents it from reading oven temperature accurately. The fault code directs the technician to inspect wiring at all connection points between the sensor and the control board.
Can I fix the U35 error myself, or do I need a professional?
A homeowner comfortable with basic electrical checks can start by inspecting the wiring harness and connectors for obvious damage, loose connections, or corrosion. However, testing RTD sensor resistance and safely accessing internal oven components requires some technical knowledge and a multimeter. If wiring looks intact and the fault persists, a qualified appliance technician should diagnose whether the sensor or control board needs replacement.
Is it safe to use my Dacor oven while the U35 code is displayed?
Using the oven while U35 is active is not recommended. A shorted temperature sensor means the control board cannot reliably monitor oven temperature, which could result in overheating or unpredictable operation. The oven should be taken out of service until the fault is diagnosed and repaired.
Will resetting the oven clear the U35 error code?
Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the U35 code, but it will return if the underlying short circuit in the RTD sensor or wiring has not been corrected. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. The wiring and sensor must be inspected and tested to resolve the issue permanently.
How much does it cost to repair a U35 error on a Dacor oven?
Repair costs vary depending on the root cause. If only a connector or wiring section needs repair, costs are generally lower, often in the range of $100 to $250 including labor. Replacing the RTD temperature sensor typically adds parts cost and may bring the total to $150 to $400. If the control board is at fault, that repair is more expensive and can range from $300 to $600 or more depending on the specific model.

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