mypros+
Error code reference

Dacor Range Oven Cooktop Error Code U33

Temp sensor (upper/single oven)

Dacor codesDacor range oven cooktop codes

Temp sensor (upper/single oven) - shorted RTD 2, 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.

MyPros+ Max

Get the full diagnostic procedure for U33.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What U33 means on a Dacor range oven cooktop

The U33 error code on a Dacor range or oven indicates a shorted RTD (Resistance Temperature Detector) on the upper or single oven temperature sensor circuit, specifically RTD 2. An RTD sensor operates by changing its electrical resistance in a predictable relationship with temperature. Under normal operating conditions, the sensor produces a resistance value that the control board reads to determine oven cavity temperature. When a short occurs, the resistance drops abnormally low or collapses to near zero ohms, causing the control board to receive an invalid signal. This triggers the U33 fault and typically disables the oven to prevent uncontrolled heating.

The short can originate at the sensor itself or anywhere along the wiring harness connecting the RTD to the oven control board. Wiring exposed to high heat cycles over time can develop cracked or melted insulation, allowing two conductors to contact each other and create a short circuit. Connector pins at the sensor plug or at the control board harness connection can also corrode, deform, or bridge together, producing the same fault condition. Because the error code specifically calls out connection points, inspecting the wiring harness and all plug connectors should be the first physical check before condemning the RTD sensor itself.

Diagnosis involves visually inspecting the wiring for damage and then using a multimeter to measure the resistance of the RTD sensor at room temperature. A healthy RTD sensor typically reads around 1000 ohms at room temperature for a PT1000-type sensor, though technicians should confirm the expected specification for the specific model. A shorted sensor will read significantly below the expected value or near zero ohms. If wiring continuity checks out, the sensor assembly itself will need replacement.

Source: manufacturer service documentation.

Common causes of U33

  1. 01

    Damaged or shorted sensor wiring harness

    Part replacement

    Heat exposure over time can crack or melt the insulation on wires running to the RTD sensor, allowing conductors to contact each other and create a short. Inspect the full length of the harness for any burned, pinched, or bare wire sections.

  2. 02

    Failed RTD temperature sensor

    Part replacement

    The RTD sensor element itself can fail internally, resulting in a short circuit condition. Testing the sensor with a multimeter at room temperature will reveal a near-zero or abnormally low resistance reading if the sensor has shorted internally.

  3. 03

    Corroded or damaged connector pins

    Wiring / connection

    The plug connectors at the RTD sensor and at the control board can corrode, deform, or have pins that bridge together, creating a short at the connection point. Carefully inspect each connector for corrosion, melting, or pin damage and clean or replace as needed.

  4. 04

    Loose or improperly seated wiring connection

    Wiring / connection

    A connector that is not fully seated can cause intermittent or sustained electrical faults including shorts. Check that all harness plugs related to the upper oven RTD circuit are fully clicked into place and secure.

  5. 05

    Control board fault

    Part replacement

    If the RTD sensor and all associated wiring test within normal parameters, a fault on the control board's sensor input circuit could be misreading or causing the short condition. This is the least common cause and should only be considered after all wiring and sensor components have been ruled out.

See the test procedure for each cause

Frequently asked questions about U33

What does U33 mean on a Dacor range, oven, cooktop?
The U33 code indicates a shorted RTD 2 temperature sensor on the upper or single oven. The sensor, which measures oven cavity temperature using electrical resistance, is producing an abnormally low or collapsed resistance reading that signals a short circuit. The oven disables itself when this fault is detected to prevent uncontrolled temperature conditions. The fault can be in the sensor itself, the wiring harness, or the connector points along the circuit.
Can I fix the U33 error myself, or do I need a technician?
A knowledgeable DIYer can begin by inspecting the wiring and connector points for visible damage, corrosion, or loose connections, which requires no special tools. If the wiring looks intact, testing the RTD sensor with a multimeter to check its resistance is the next step. Replacing the temperature sensor is a straightforward repair for someone comfortable working with appliances. However, if the control board is involved, professional diagnosis is recommended.
Is it safe to use my Dacor oven while it shows the U33 error?
No, you should not attempt to operate the oven while the U33 error is active. A shorted temperature sensor means the control board cannot reliably monitor oven temperature, which creates a risk of overheating. The oven's safety shutdown is in place for this reason, and bypassing it is not advisable. Resolve the fault before resuming use.
Will resetting the oven clear the U33 error code?
A power reset by turning off the circuit breaker for one to two minutes may temporarily clear the code, but it will return if the underlying fault is still present. The short circuit in the RTD sensor circuit must be physically repaired or the faulty component replaced for the error to clear permanently. Repeated resets without repair will not resolve the problem.
How much does it cost to repair a U33 error on a Dacor oven?
If only the RTD temperature sensor needs replacement, parts typically range from around $30 to $100 depending on the model, with labor adding $75 to $200 if a technician performs the work. If the wiring harness requires replacement or repair, costs can increase moderately. A control board replacement, if needed, is the most expensive scenario and can range from $200 to $500 or more for parts alone.

Related Dacor range oven cooktop codes

All Dacor range oven cooktop codes
View all 115 Dacor range oven cooktop codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass