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Error code reference

Dacor Range Oven Cooktop Error Code L25

Over temperature (lower oven)

Dacor codesDacor range oven cooktop codes

Over temperature (lower oven) - ambient temp probe on relay board is shorted.

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What L25 means on a Dacor range oven cooktop

The L25 error code on a Dacor range or oven indicates an over-temperature condition in the lower oven cavity, specifically tied to the ambient temperature probe located on the relay board. This probe is a thermistor-type sensor that monitors the thermal environment around the relay board itself, not the oven cavity air temperature. When the control system detects that this probe is shorted, it interprets the fault as an over-temperature event and triggers the L25 code to protect the electronics from heat damage.

A shorted ambient temperature probe on the relay board typically means the sensor's internal resistance has dropped to near zero, or the wiring between the probe and the board has developed a short to ground or another conductor. Under normal operating conditions, the probe presents a measurable resistance value to the control circuit. A short causes the circuit to read an out-of-range low resistance, which the control interprets as an extremely high temperature reading, triggering the protective fault.

Common root causes include a failed thermistor on the relay board, damaged wiring harness insulation causing conductors to contact each other or the chassis, or in some cases a failing relay board itself where the probe circuit has degraded internally. Heat cycling over time can degrade connector integrity at the probe's harness plug, leading to intermittent or permanent shorts. Diagnosing this fault requires isolating the probe from the board and measuring its resistance directly to confirm whether the probe itself or the board's input circuit is the source of the short.

Source: manufacturer service documentation.

Common causes of L25

  1. 01

    Failed ambient temperature probe (thermistor)

    Part replacement

    The thermistor on the relay board has internally shorted, dropping its resistance to near zero. Disconnecting the probe and measuring its resistance with a multimeter will confirm a failed sensor if the reading is at or near zero ohms.

  2. 02

    Shorted or damaged wiring harness

    Part replacement

    Heat exposure or physical damage can cause the insulation on the probe's wiring to break down, allowing conductors to contact each other or the metal chassis. Inspect the harness routing near the relay board for chafing, melting, or pinched wires.

  3. 03

    Corroded or loose connector at the relay board

    Wiring / connection

    The harness connector that plugs into the relay board at the probe circuit can develop corrosion or a poor connection that mimics a short condition. Inspect and clean the connector pins and ensure the plug is fully seated.

  4. 04

    Faulty relay board

    Part replacement

    If the probe and its wiring test correctly, the relay board's internal probe input circuit may have failed, causing it to incorrectly report a short condition. Board-level failure typically requires full relay board replacement.

See the test procedure for each cause

Frequently asked questions about L25

What does L25 mean on a Dacor range, oven, cooktop?
L25 indicates an over-temperature fault for the lower oven, caused specifically by a shorted ambient temperature probe on the relay board. The relay board uses this probe to monitor the thermal environment around its own electronics. When the probe shorts, the control reads it as an extreme temperature condition and locks out normal operation to prevent damage.
Can I fix the L25 error myself?
A knowledgeable DIYer can attempt diagnosis by locating the relay board, disconnecting the ambient temperature probe connector, and measuring the probe's resistance with a multimeter. If the resistance reads near zero ohms, the probe or its wiring is shorted. However, accessing the relay board requires disassembling the oven's back panel or control area, and working near live components carries risk, so professional service is advisable if you are not comfortable with appliance electrical work.
Is it safe to use my Dacor oven while the L25 code is active?
You should not attempt to bypass or continue using the oven while L25 is active. The fault indicates a failure in a protective temperature monitoring circuit, and operating the appliance without a functioning safety sensor could allow actual overheating to go undetected. Discontinue use until the fault is properly diagnosed and repaired.
Will resetting the oven clear the L25 error code?
Power cycling the oven by turning off the circuit breaker for a few minutes may temporarily clear the code, but it will return quickly if the underlying fault, either a shorted probe, damaged wiring, or a failed relay board, has not been corrected. A reset alone is not a repair and should only be used as part of the diagnostic process.
How much does it cost to repair the L25 error on a Dacor oven?
Repair costs vary depending on the failed component. If only the ambient temperature probe or its wiring needs replacement, costs are generally lower, typically in the range of $100 to $250 including labor. If the relay board itself has failed and requires replacement, parts alone can range from $150 to $400 or more depending on the specific model, with additional labor on top of that.

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