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Error code reference

Dacor Oven Error Code L33

Lower oven temp sensor shorted probe 2

Dacor codesDacor oven codes

Lower oven temp sensor shorted probe 2 - 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.

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 oven

The L33 error code on a Dacor oven indicates that the lower oven temperature sensor probe 2 has registered a shorted condition. Specifically, the analog-to-digital converter at the relay board has detected a value of 0x0010 or lower held continuously for 60 seconds. This A/D threshold corresponds to an extremely low resistance state at the sensor input, which the control interprets as a short circuit rather than a valid temperature reading. The lower oven temperature sensor is a resistance-based probe (typically an RTD or NTC thermistor) that changes resistance predictably with temperature. When the circuit shorts, the A/D value collapses to near zero, signaling a fault.

The relay board plays a central role in this fault because it is the point where the probe signal is received and converted. A short can occur at several locations: within the probe itself, along the wiring harness between the probe and the relay board, or at the connector terminals. Damaged insulation, heat-induced wire degradation, or a probe that has physically failed internally can all drive the resistance to near zero and trigger this fault. Connector corrosion or a pinched wire making contact with the oven chassis can produce the same result.

Diagnosis begins at the relay board by visually inspecting the probe connector for signs of heat damage, corrosion, or pushed-back terminals. The probe should then be disconnected and its resistance measured directly across the connector pins. A shorted probe will read near zero ohms rather than the expected resistance for the ambient temperature. If the probe checks out, the wiring harness between the probe and the relay board should be tested for continuity to chassis ground to rule out an insulation fault.

Source: manufacturer service documentation.

Common causes of L33

  1. 01

    Failed lower oven temperature probe

    Part replacement

    The probe itself has developed an internal short circuit, collapsing its resistance to near zero. Disconnect the probe and measure resistance across its terminals; a shorted probe will read close to 0 ohms instead of the expected ambient-temperature value.

  2. 02

    Damaged or shorted probe wiring harness

    Part replacement

    Heat exposure or physical damage can compromise the insulation on the probe leads, allowing the wires to contact the oven chassis or each other. Inspect the harness along its full run from the probe to the relay board and test for continuity to chassis ground.

  3. 03

    Loose or corroded probe connector at the relay board

    Wiring / connection

    A corroded or improperly seated connector at the relay board can create a low-resistance path that mimics a shorted probe. Inspect the connector pins for oxidation, debris, or pushed-back terminals, and reseat the connector firmly.

  4. 04

    Relay board input circuit fault

    Part replacement

    If the probe and harness test correctly, the A/D input circuit on the relay board itself may have failed, causing it to read a false short condition. This would be confirmed only after ruling out the probe and wiring.

See the test procedure for each cause

Frequently asked questions about L33

What does L33 mean on a Dacor oven?
L33 indicates that the lower oven temperature sensor probe 2 has registered a shorted condition. The relay board's analog-to-digital converter detected a value of 0x0010 or lower held for 60 continuous seconds, which signals that the probe circuit has collapsed to near-zero resistance. This is typically caused by a failed probe, damaged wiring, or a faulty connector at the relay board.
Can I fix the L33 error myself on a Dacor oven?
A knowledgeable DIYer can begin by checking the probe connector at the relay board for corrosion or loose seating, which requires no parts and costs nothing. If the connector looks good, testing the probe resistance with a multimeter is straightforward. Replacing the probe or harness is a moderate repair, but if the relay board itself is at fault, that repair is more complex and may warrant professional service.
Is it safe to use my Dacor oven when the L33 code is showing?
You should not use the oven while the L33 code is active. A shorted temperature sensor means the control cannot accurately read the lower oven temperature, which creates a risk of uncontrolled overheating. Stop using the oven until the probe and wiring have been inspected and the fault is resolved.
Will resetting the oven clear the L33 error code?
A power reset may temporarily clear the display, but the L33 code will return if the underlying fault is still present. The fault requires 60 continuous seconds of the out-of-range A/D value to trigger, so the code will reappear as soon as the oven attempts to operate with the shorted probe still in the circuit.
How much does it cost to repair the L33 error on a Dacor oven?
If only the temperature probe needs replacement, parts and labor typically run in the range of $100 to $250 depending on your location and service provider. If the relay board is at fault, repair costs can range from $200 to $500 or more. Getting a diagnosis from a qualified technician before ordering parts is recommended to avoid unnecessary expense.

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