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Error code reference

Dacor Range Oven Cooktop Error Code C23

Heritage: OCC ambient over temperature

Dacor codesDacor range oven cooktop codes

Heritage: OCC ambient over temperature - control board ambient temperature is above 165°F; oven shuts down with cooling fans ON until ambient falls to 122°F.

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What C23 means on a Dacor range oven cooktop

The C23 error code on Dacor Heritage ranges and ovens indicates that the OCC (oven control circuit) ambient temperature has exceeded 165°F at the control board location. This is a thermal protection response built into the control system. The appliance monitors the temperature of the environment surrounding the control board itself, not the oven cavity temperature. When that ambient reading climbs above the 165°F threshold, the oven shuts down automatically to prevent heat damage to the electronic control components.

When C23 triggers, the oven does not simply go dark and lock out. Instead, the cooling fans remain active and continue running while the unit waits for the ambient temperature around the control board to drop back down to 122°F. Only once that lower threshold is reached will normal operation become available again. This two-threshold design, a high cutoff at 165°F and a lower reset point at 122°F, is intentional and prevents the unit from cycling on and off rapidly near the trip point.

The most common reasons this condition occurs include blocked ventilation around the appliance, a failed or underperforming cooling fan, operating the oven at high temperatures for extended periods in an enclosed or poorly ventilated installation, or a control board that is beginning to fail and generating excess heat internally. In some cases, the ambient temperature sensor integrated into the control board itself may be reading incorrectly, triggering the fault even when actual temperatures are within normal range.

Source: manufacturer service documentation.

Common causes of C23

  1. 01

    Blocked or restricted ventilation

    Wiring / connection

    If the oven is installed in a tight cabinet cutout without adequate clearance, or if vents are obstructed by debris or nearby objects, heat builds up around the control board faster than the fans can dissipate it. Check that installation clearances match the specifications for the unit and that no vents are blocked.

  2. 02

    Cooling fan failure or reduced airflow

    Part replacement

    The cooling fan is responsible for moving air away from the control board and other heat-sensitive components. A fan that is failing, running slowly due to a worn motor, or clogged with grease and dust will not adequately cool the control area, allowing temperatures to climb above the 165°F cutoff.

  3. 03

    Extended high-temperature operation

    Wiring / connection

    Running the oven at maximum temperatures for long periods, especially with a self-clean cycle, can push ambient heat levels high enough to trip C23 even when all components are functioning normally. This is more likely in kitchens with limited airflow or during warm ambient conditions.

  4. 04

    Faulty ambient temperature sensor on the control board

    Part replacement

    The control board includes an integrated ambient temperature sensor. If this sensor has drifted out of calibration or is failing, it may report temperatures above 165°F even when the actual board temperature is within safe limits, causing nuisance trips of the C23 code.

  5. 05

    Failing or damaged control board

    Part replacement

    A control board that is deteriorating internally can generate excess heat on its own or lose the ability to accurately regulate its thermal monitoring circuits. If ventilation and fans check out correctly but C23 continues to appear, the control board itself may need replacement.

See the test procedure for each cause

Frequently asked questions about C23

What does C23 mean on a Dacor range, oven, cooktop?
C23 on a Dacor Heritage appliance means the control board ambient temperature has exceeded 165°F, triggering a protective shutdown. The oven turns off to protect its electronics, but the cooling fans stay on to bring the temperature back down. Normal operation resumes automatically once the ambient temperature at the control board drops to 122°F.
Can I fix a C23 error myself or do I need a technician?
Some causes of C23 are owner-serviceable, such as clearing blocked vents, removing debris from around the appliance, or verifying that installation clearances are correct. If the error persists after addressing airflow, diagnosing and replacing a cooling fan or control board requires disassembly and comfort working with appliance electronics, so many homeowners prefer to call a technician for those steps.
Is it safe to use my Dacor oven while the C23 code is displayed?
No. When C23 is active, the oven has already shut itself down as a protective measure. You should not attempt to override or reset the unit and resume cooking until the cooling fans have had time to run and the appliance has cooled. Repeatedly forcing the oven to restart while the underlying cause is unresolved risks permanent damage to the control board.
Will resetting the oven clear the C23 error code?
A power reset may clear the code temporarily, but C23 will return if the root cause has not been addressed. The appliance is designed to resume operation on its own once the ambient temperature falls back to 122°F, so in many cases a manual reset is not even necessary. If the fault reappears consistently, investigate ventilation, fan function, or control board condition before relying on resets.
How much does it cost to repair a Dacor oven showing a C23 error?
Repair costs vary depending on the cause. If only cleaning or improving ventilation is needed, there may be no parts cost at all. A cooling fan replacement typically runs in the range of $75 to $200 for the part, plus labor if a technician is involved. Control board replacement on a Dacor Heritage unit is more significant, with parts often ranging from $200 to $500 or more depending on the specific model, plus diagnostic and labor fees.

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