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Error code reference

Dacor Oven Error Code L22

Lower oven over temperature

Dacor codesDacor oven codes

Lower oven over temperature - probe 1 and probe 2 temperature amplifier failure.

First step from the service manual

Verify probe cables are connected properly. Replace temperature probe if needed.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What L22 means on a Dacor oven

The L22 error code on a Dacor oven indicates an over-temperature condition in the lower oven cavity, specifically tied to a simultaneous failure of the temperature amplifier circuits associated with both probe 1 and probe 2. These two probes work together to monitor the lower oven's internal temperature, and their signals are processed through amplifier circuits that convert raw sensor readings into usable temperature data for the control board. When both amplifier channels report a fault at the same time, the control system interprets this as an over-temperature event and locks out normal operation to prevent damage or a safety hazard.

The most common root cause is a problem with the probe cables themselves. Loose, damaged, or improperly seated cable connections between the temperature probes and the control board can disrupt the signal path, causing the amplifier circuits to receive corrupted or out-of-range readings. Because both probes share a common wiring harness or routing path in many configurations, a single connection issue can trigger failures in both channels simultaneously. Physical damage to the probe cables, such as pinching or heat-related insulation breakdown, is another frequent contributor.

If cable inspection and reseating do not resolve the fault, the temperature probes themselves may need to be replaced. A probe that has drifted out of its calibrated resistance range will send inaccurate signals that the amplifier circuits cannot correctly process, triggering the dual-channel fault. In less common cases, the fault may originate in the control board's amplifier circuitry itself, particularly if probe and cable replacements do not clear the code.

Source: manufacturer service documentation.

Common causes of L22

  1. 01

    Loose or disconnected probe cables

    Wiring / connection

    The cable connectors linking the temperature probes to the control board may have come loose or partially unseated. Reseating all probe cable connections is the recommended first step.

  2. 02

    Damaged probe wiring harness

    Part replacement

    Heat exposure or physical pinching can cause insulation breakdown or broken wires in the probe cable harness, disrupting the signal to both amplifier channels. Visually inspect the full cable run for signs of damage.

  3. 03

    Failed temperature probe

    Part replacement

    A temperature probe that has failed or drifted out of its correct resistance range will send signals the amplifier circuits cannot process correctly, triggering a dual-channel fault. Replacing the probe is the next step if cables check out.

  4. 04

    Control board amplifier circuit failure

    Part replacement

    If probe and cable replacements do not resolve the L22 code, the fault may lie in the amplifier circuitry on the control board itself. This is less common but requires control board replacement to repair.

See the test procedure for each cause

Frequently asked questions about L22

What does L22 mean on a Dacor oven?
L22 indicates a lower oven over-temperature fault combined with a temperature amplifier failure affecting both probe 1 and probe 2. The oven's control system has detected that the signals from both lower oven temperature probes are outside acceptable parameters. This is most often caused by loose probe cable connections or a failed temperature probe.
Can I fix the L22 error on my Dacor oven myself?
The first diagnostic step is something many homeowners can handle: check that the probe cables are firmly connected at both the probe end and the control board end. If cables are secure and the error persists, replacing the temperature probe is the next step and is a manageable repair for someone comfortable with appliance work. If the error continues after a probe replacement, the control board may be involved and a qualified technician should be consulted.
Is it safe to use my Dacor oven when the L22 code is displayed?
No, you should not attempt to operate the oven while L22 is active. The code indicates the oven's temperature monitoring system is not functioning correctly, which means the oven cannot reliably regulate its internal temperature. Continuing to use it could create a fire hazard or damage internal components.
Will resetting the oven clear the L22 error code?
A power reset, such as turning off the circuit breaker for 30 seconds, may temporarily clear the code, but it will return if the underlying cause is not fixed. The fault is tied to a hardware issue with the probe cables or the temperature probes themselves, and resetting alone does not address those problems. A proper repair is needed to prevent the code from recurring.
How much does it cost to repair a Dacor oven showing an L22 error?
Repair costs vary depending on what needs to be replaced. A temperature probe typically costs in the range of $30 to $80 for the part, while a control board replacement can range from $150 to $400 or more depending on the model. Adding professional labor, total repair costs can range from $100 to $600 or higher, which is why starting with the simpler cable and probe checks is recommended before assuming the control board is faulty.

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