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Error code reference

Dacor Range Oven Cooktop Error Code L33

Temp sensor (lower oven)

Dacor codesDacor range oven cooktop codes

Temp sensor (lower 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.

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What L33 means on a Dacor range oven cooktop

The L33 error code on a Dacor range or oven indicates a shorted RTD (Resistance Temperature Detector) on the lower oven temperature sensor circuit, identified as RTD 2. An RTD sensor works by changing its electrical resistance in proportion to temperature. Under normal operating conditions, the sensor produces a predictable resistance reading that the oven control board uses to regulate heat. When the control board detects a short circuit in this sensor loop, meaning resistance has dropped abnormally low or the circuit is essentially reading near zero ohms, it cannot obtain accurate temperature data and triggers the L33 fault.

The most common entry point for diagnosing L33 is the wiring at the connection points between the lower oven temperature sensor and the control board. A short can occur within the sensor itself if the RTD element has failed internally, but it can also result from damaged or pinched wiring where insulation has worn through and two conductors are making direct contact. Connectors that have corroded, melted from heat exposure, or become contaminated can also create a low-resistance path that mimics a shorted sensor.

To begin diagnosing, disconnect power to the appliance and inspect all wiring harness connections along the lower oven sensor circuit. With the sensor unplugged, measure the resistance across the RTD 2 sensor terminals. A shorted sensor will read near zero ohms rather than the expected resistance for its temperature range. If the sensor reads correctly in isolation, the short is likely in the wiring harness or at a connector rather than in the sensor itself.

Source: manufacturer service documentation.

Common causes of L33

  1. 01

    Failed lower oven RTD sensor (internal short)

    Part replacement

    The RTD 2 temperature sensor itself can fail internally, causing its resistance to drop to near zero ohms. This is confirmed by measuring resistance directly across the unplugged sensor terminals and finding a value far below the expected normal range.

  2. 02

    Damaged or pinched wiring harness

    Part replacement

    Wiring routed near the oven cavity can become pinched, abraded, or heat-damaged over time, causing the insulation to break down and two conductors to contact each other. Inspect the full length of the sensor wiring for visible damage, burns, or areas where the wire passes through metal panels.

  3. 03

    Corroded or damaged wiring connectors

    Wiring / connection

    The connection points between the sensor lead and the main wiring harness are susceptible to corrosion, heat distortion, and contamination. Inspect each connector for discoloration, melted plastic, or corrosion that could be creating an unintended low-resistance path.

  4. 04

    Moisture or grease contamination at connector

    Wiring / connection

    Grease or moisture that has migrated into sensor connectors can create a conductive path between terminals, triggering a false short reading. Cleaning and drying the connectors may resolve the fault if no physical damage is present.

  5. 05

    Faulty control board misreading the sensor circuit

    Part replacement

    In less common cases, the oven control board itself may have a defective input circuit that incorrectly reports a short on the RTD 2 channel even when the sensor and wiring are intact. This is typically diagnosed only after the sensor and all wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about L33

What does L33 mean on a Dacor range, oven, cooktop?
L33 indicates a shorted RTD 2 sensor on the lower oven temperature circuit. The control board has detected an abnormally low resistance reading from the lower oven temperature sensor, which prevents accurate temperature regulation. The diagnostic process starts with inspecting all wiring connection points along the lower oven sensor circuit. If the wiring checks out, the sensor itself likely needs to be tested or replaced.
Can I fix an L33 error on my Dacor oven myself?
Homeowners comfortable with basic appliance diagnostics can start by unplugging the oven and inspecting the sensor wiring and connectors for obvious damage. However, accurately diagnosing a shorted RTD requires a multimeter to measure resistance across the sensor terminals, and replacing components inside the oven cavity involves working around high-voltage parts. If you are not experienced with appliance electrical work, calling a qualified technician is the safer choice.
Is it safe to use my Dacor oven while L33 is displayed?
It is not advisable to operate the oven while L33 is active. A shorted temperature sensor means the control board cannot reliably monitor the lower oven temperature, which could result in uncontrolled overheating. Continuing to use the oven in this state poses a potential safety risk and may cause additional damage to internal components.
Will resetting my Dacor oven clear the L33 error code?
Disconnecting power to the oven and restoring it may temporarily clear the L33 code, but the fault will return if the underlying problem has not been resolved. A short in the RTD 2 sensor circuit is a hardware issue that requires physical inspection and repair. Resetting is useful for confirming whether the fault is intermittent, but it is not a permanent fix.
How much does it cost to repair an L33 error on a Dacor oven?
Repair costs vary depending on the root cause. If the lower oven temperature sensor has shorted internally and needs replacement, parts and labor typically run in the range of $150 to $350. If the fault is traced to damaged wiring or a connector issue, labor costs may be lower since no major parts are needed. Control board replacement, if required, can raise the total cost significantly higher.

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