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Error code reference

Dacor Range Oven Cooktop Error Code L23

Over temperature (lower oven)

Dacor codesDacor range oven cooktop codes

Over temperature (lower oven) - ambient temp around relay board is too high.

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What L23 means on a Dacor range oven cooktop

The L23 error code on a Dacor range or oven indicates an over-temperature condition specifically affecting the lower oven, caused by excessive ambient heat surrounding the relay board. The relay board is a critical control component that manages power distribution to the bake and broil elements, and it is sensitive to the thermal environment in which it operates. When the temperature around this board climbs beyond its safe operating threshold, the control system triggers L23 to prevent damage to the board's components, including the relays, capacitors, and printed circuit traces.

This condition is distinct from an oven cavity over-temperature fault. The issue is not that the oven itself is overheating internally beyond its set point, but rather that heat is accumulating in the area where the relay board is mounted, typically in the control cavity behind or beneath the oven. Common contributors include blocked ventilation pathways, failed cooling fans, degraded thermal insulation allowing heat migration from the oven cavity, or the oven being installed in a space with insufficient clearance for heat dissipation.

Because the relay board is directly exposed to this elevated ambient heat, continued operation can cause relay failure, solder joint degradation, or permanent damage to control circuitry. Resolving L23 requires identifying the source of the heat buildup rather than simply replacing the board. Technicians should inspect the cooling fan operation, verify installation clearances, and check that insulation surrounding the oven cavity is intact and properly positioned before powering the unit back on.

Source: manufacturer service documentation.

Common causes of L23

  1. 01

    Cooling fan failure or obstruction

    Part replacement

    Dacor ovens use a cooling fan to circulate air around the control and relay board area. If this fan has failed, seized, or is blocked by debris, heat from the oven cavity will accumulate around the relay board and trigger L23. Check the fan for operation and free movement.

  2. 02

    Blocked or restricted ventilation

    Wiring / connection

    Inadequate airflow through the oven's ventilation slots or inadequate cabinet clearance can cause heat to build up around internal components. Inspect all vents for blockages and confirm the installation meets Dacor's clearance specifications.

  3. 03

    Degraded or displaced oven cavity insulation

    Part replacement

    If the insulation blanket surrounding the lower oven cavity has shifted, torn, or deteriorated, radiant heat can migrate more aggressively into the relay board compartment. Inspect the insulation during disassembly for gaps, compression, or damage.

  4. 04

    Relay board mounted in excessive ambient heat

    Part replacement

    In some cases the relay board itself may be positioned too close to a heat source or may have experienced prior thermal stress that reduced its tolerance. If all ventilation and insulation checks pass, the board itself may need evaluation and replacement.

  5. 05

    Extended high-temperature cooking cycles

    Wiring / connection

    Running the self-clean cycle or prolonged high-temperature baking in a unit with marginal cooling capacity can push the ambient temperature around the relay board over its limit. If the error only appears during self-clean or extended high-heat use, focus diagnostics on cooling system performance.

See the test procedure for each cause

Frequently asked questions about L23

What does L23 mean on a Dacor range, oven, cooktop?
L23 indicates that the ambient temperature surrounding the relay board in the lower oven section has exceeded a safe operating threshold. This is a protective fault that shuts down operation to prevent damage to the relay board and associated control electronics. It is not a fault indicating the oven cavity itself has overheated beyond its cooking set point. The underlying cause is typically a ventilation or cooling system problem.
Is it safe to keep using my Dacor oven when L23 is displayed?
No, you should stop using the oven until the fault is resolved. The L23 code exists to protect the relay board from heat damage, and continuing to operate the oven in this condition risks permanent damage to the control electronics. In some cases it could also indicate that excessive heat is present in areas that should remain cool, which warrants inspection before further use.
Will resetting the oven clear the L23 error code?
Resetting the oven by cycling power may temporarily clear the L23 code, but it will return if the underlying cause of the heat buildup has not been corrected. A reset does not fix the ventilation, cooling fan, or insulation issue causing the fault. Treating the reset as a repair is not recommended, as repeated thermal stress can degrade the relay board over time.
How do I fix the L23 error on my Dacor oven?
Start by checking that all ventilation openings on and around the oven are clear and that the oven has the required clearances from surrounding cabinetry. Next, verify that the cooling fan is operating and spinning freely. If ventilation is adequate, inspect the oven cavity insulation for damage or displacement. If those checks do not resolve the issue, the relay board may require inspection or replacement by a qualified technician.
How much does it cost to repair an L23 error on a Dacor oven?
Repair costs vary depending on the root cause. If the fix involves clearing a blocked vent or repositioning insulation, costs may be limited to a service call fee, typically in the range of $75 to $150. If the cooling fan needs replacement, parts and labor combined often range from $150 to $350. Relay board replacement on a Dacor appliance tends to be more expensive, generally in the $300 to $600 range depending on the specific model and labor rates in your area.

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