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Error code reference

Dacor Range Oven Cooktop Error Code L22

Over temperature (lower oven)

Dacor codesDacor range oven cooktop codes

Over temperature (lower oven) - one of the sensors are out of calibration or bad.

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Get the full diagnostic procedure for L22.

  • 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
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What L22 means on a Dacor range oven cooktop

The L22 error code on a Dacor range or oven indicates an over-temperature condition in the lower oven cavity. This fault triggers when the control board detects that the lower oven has exceeded its safe operating temperature threshold, and the root cause is typically traced to the oven temperature sensor (RTD probe) being out of calibration or having failed entirely. The sensor communicates oven temperature to the control board via resistance values: a properly functioning RTD sensor reads approximately 1080 to 1100 ohms at room temperature, and resistance rises proportionally with heat. When the sensor drifts out of calibration or fails, the board may receive inaccurate readings that suggest dangerously high temperatures even when actual cavity temps are normal.

A second scenario involves the sensor reporting accurate temperatures, but the oven genuinely is overheating due to a runaway bake or broil element, or a relay on the control board that is stuck in the closed position. In these cases, the element receives continuous power regardless of the thermostat state, driving the cavity temperature beyond limits and triggering L22. Distinguishing between a faulty sensor and a true over-temperature event is critical before replacing components.

The wiring harness connecting the RTD sensor to the control board is another potential contributor. Damaged insulation, loose connectors, or corrosion at the sensor terminals can introduce resistance errors that the board interprets as temperature spikes. A thorough diagnostic should include resistance testing of the sensor at the probe and at the control board connector, as well as a visual inspection of the harness for heat damage or pinched wires.

Source: manufacturer service documentation.

Common causes of L22

  1. 01

    Faulty or out-of-calibration RTD temperature sensor

    Part replacement

    The lower oven RTD sensor is the most common cause of L22. If the probe's resistance reading deviates significantly from the expected value at a known temperature, it needs replacement.

  2. 02

    Damaged sensor wiring harness

    Wiring / connection

    Heat damage, corrosion, or a loose connector between the RTD sensor and the control board can cause erratic resistance readings that mimic an over-temperature condition. Inspect the harness visually and test continuity at the connector terminals.

  3. 03

    Stuck relay on the control board

    Part replacement

    If the bake or broil relay on the control board is welded or stuck closed, the heating element will run continuously without cycling off, causing the oven to genuinely overheat and trigger L22.

  4. 04

    Failed bake or broil element causing runaway heat

    Part replacement

    A shorted heating element can draw excess current and generate heat beyond normal operating levels. This results in a real over-temperature event rather than a sensor misread.

  5. 05

    Control board failure

    Part replacement

    If the sensor and wiring test correctly but L22 persists, the control board itself may be misinterpreting sensor input signals due to an internal component failure.

See the test procedure for each cause

Frequently asked questions about L22

What does L22 mean on a Dacor range, oven, cooktop?
L22 indicates an over-temperature fault in the lower oven, meaning the control board has detected temperatures exceeding safe limits in that cavity. The fault is typically caused by a temperature sensor that is out of calibration or has failed, though a stuck relay or shorted heating element can also be responsible. The oven will typically suspend normal operation until the condition is diagnosed and corrected.
Can I fix the L22 error myself?
A knowledgeable DIYer can diagnose this code by testing the lower oven RTD sensor with a multimeter and checking resistance against expected values at room temperature, typically around 1080 to 1100 ohms. Inspecting the sensor wiring harness for damage is also a straightforward step. However, if the fault points to a stuck relay or a failed control board, those repairs are better handled by a qualified technician due to the high-voltage components involved.
Is it safe to use my Dacor oven when the L22 code is displayed?
You should not continue using the oven while L22 is active. If the oven is genuinely overheating due to a stuck relay or shorted element, continued operation poses a fire and safety risk. Even if the fault is only a bad sensor, the control board cannot properly regulate temperature, making accurate cooking impossible and potentially unsafe.
Will resetting the oven clear the L22 error code?
A power reset, by turning off the circuit breaker for one to two minutes and restoring power, may temporarily clear the L22 code. However, if the underlying cause such as a failed sensor, damaged wiring, or a stuck relay has not been repaired, the code will return during the next use. A reset alone is not a fix.
How much does it cost to repair a Dacor oven showing the L22 code?
Repair costs vary depending on the root cause. A replacement RTD temperature sensor typically costs between $30 and $80 for the part, plus labor if a technician is hired. Control board replacement is the most expensive scenario, with parts ranging from $150 to $400 or more depending on the model. Adding a technician's diagnostic and labor fees, total repair costs can range from $100 to $600 or higher.

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