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Error code reference

Dacor Oven Error Code L25

Lower oven ambient temperature probe shorted

Dacor codesDacor oven codes

Lower oven ambient temperature probe shorted - A/D value of 0X10 or lower registered.

First step from the service manual

Clear error and check oven by running a basic cooking mode. Replace upper relay board.

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

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What L25 means on a Dacor oven

The L25 error code on a Dacor oven indicates that the lower oven ambient temperature probe has shorted. Specifically, the analog-to-digital (A/D) converter in the control system has registered a value of 0X10 or lower for the lower oven ambient probe circuit. An ambient temperature probe monitors the general cavity temperature rather than a specific element like a bake or broil sensor. When the A/D value drops to this extremely low threshold, the control interprets the signal as a short circuit condition, meaning the probe's resistance has collapsed to near zero or the signal wire has made direct contact with ground.

The most likely causes include a failed ambient probe with an internal short, damaged wiring in the probe harness, or a corroded connector causing a low-resistance path to ground. The upper relay board is also directly implicated in this fault, as the relay board conditions and routes the probe signals before they reach the main control. A failure on the relay board, such as a shorted input circuit or damaged trace, can produce the same low A/D reading even if the probe itself is functioning normally.

The recommended first diagnostic step is to clear the error code and run a basic cooking mode to observe whether the fault returns immediately or intermittently. If the error persists or returns, the upper relay board should be replaced. Technicians should also inspect the ambient probe connector and wiring harness for signs of heat damage, pinched wires, or corrosion before condemning either component.

Source: manufacturer service documentation.

Common causes of L25

  1. 01

    Shorted ambient temperature probe

    Part replacement

    The lower oven ambient probe itself may have failed internally, causing its resistance to drop near zero. This produces the abnormally low A/D reading that triggers L25.

  2. 02

    Failed or damaged upper relay board

    Part replacement

    The upper relay board processes ambient probe signals, and a shorted input circuit or damaged component on the board can generate a false L25 fault even when the probe is intact. Replacement of the relay board is a primary recommended repair step.

  3. 03

    Damaged probe wiring harness

    Wiring / connection

    Heat exposure, pinching, or physical wear can cause insulation breakdown in the probe's wiring harness, creating a short to ground. Inspect the full length of the harness for melted, cracked, or bare wires.

  4. 04

    Corroded or loose probe connector

    Wiring / connection

    Corrosion or moisture at the probe connector can create a low-resistance path that mimics a shorted probe. Disconnecting and inspecting the connector for discoloration, pitting, or debris is a quick first check.

  5. 05

    Intermittent control board communication fault

    Wiring / connection

    In some cases the main control board's A/D input circuit can misread a valid probe signal, especially after a power event. Clearing the error and running a test cycle confirms whether the fault is persistent or a one-time anomaly.

See the test procedure for each cause

Frequently asked questions about L25

What does L25 mean on a Dacor oven?
L25 means the lower oven ambient temperature probe has been detected as shorted. The oven's control system monitors the analog-to-digital value from this probe, and when that value drops to 0X10 or lower, the L25 code is stored. This indicates either a failed probe, a wiring short, or a problem with the upper relay board that processes the probe signal.
Can I fix the L25 error myself, or do I need a technician?
Some basic steps, like clearing the code and running a test cycle, can be performed without special tools. However, properly diagnosing whether the fault lies in the ambient probe, the wiring harness, or the upper relay board requires the ability to inspect internal components and connectors. Replacing the relay board or probe involves disassembly of the oven and working near high-voltage components, so a qualified technician is recommended if you are not experienced with appliance repair.
Is it safe to use my Dacor oven while the L25 error is showing?
A shorted ambient probe can prevent the control system from accurately monitoring oven cavity temperature, which reduces the reliability of thermal protection features. It is best to avoid using the oven until the fault is diagnosed and repaired. Continued use with a compromised temperature sensing circuit could result in inaccurate cooking temperatures or unexpected control behavior.
Will resetting the oven clear the L25 error code?
Clearing the error code is actually the first recommended diagnostic step, and in some cases the fault may not return if it was caused by a temporary condition or a power anomaly. However, if the underlying cause is a shorted probe, a damaged harness, or a faulty upper relay board, the L25 code will return once the oven runs a cooking cycle. A clear that does not result in a returning fault suggests the event was intermittent.
How much does it cost to repair a Dacor oven with an L25 error?
Repair costs vary depending on which component is at fault. A replacement ambient temperature probe typically falls in the range of $20 to $80 for the part alone. A new upper relay board is generally more expensive, often ranging from $100 to $300 or more depending on the specific model. Adding labor costs for a qualified appliance technician will increase the total, commonly bringing the overall repair to somewhere between $150 and $500 depending on parts needed and local rates.

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