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Error code reference

Dacor Oven Error Code C33

Relay board ambient temperature is above 80°C; oven shuts down and cooling fans turn ON until ambient…

Dacor codesDacor oven codes

Relay board ambient temperature is above 80°C; oven shuts down and cooling fans turn ON until ambient temperature falls to 50°C.

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What C33 means on a Dacor oven

The C33 error code on a Dacor oven indicates that the relay board has detected an ambient temperature exceeding 80°C in the area surrounding the control electronics. The relay board includes a thermal monitoring circuit that continuously measures the temperature of the environment around it. When that threshold is breached, the oven's control system initiates an automatic protective shutdown to prevent heat damage to the relay board and other electronic components. Simultaneously, the cooling fans are activated to circulate air and reduce the elevated temperature.

The oven remains shut down and the fans continue running until the ambient temperature around the relay board drops back to 50°C, at which point normal operation can resume. This 30-degree differential between the shutdown threshold and the recovery threshold is intentional, ensuring that the electronics have cooled sufficiently before the oven is allowed to restart. The relay board itself is typically located in the control cavity or behind the rear panel, where it can be exposed to heat conducted or radiated from the oven cavity.

Common contributors to this condition include blocked or failed cooling fans that cannot adequately ventilate the electronics cavity, heat buildup from extended high-temperature cooking cycles, improper installation with insufficient clearance around the unit, or a relay board that has developed a fault causing it to generate excess heat internally. In some cases, ambient kitchen conditions combined with a long self-clean cycle can push temperatures into the fault range even when all components are functioning correctly.

Source: manufacturer service documentation.

Common causes of C33

  1. 01

    Cooling fan failure or reduced airflow

    Part replacement

    If one or more of the oven's cooling fans has failed or is running at reduced speed, heat cannot be properly evacuated from the electronics cavity. Listen for fan noise during and after operation to help identify this issue.

  2. 02

    Extended high-temperature cooking or self-clean cycle

    Wiring / connection

    Long self-clean cycles or sustained high-temperature baking can drive significant heat into the relay board area. This can trigger C33 even when all components are functioning correctly, particularly in warm kitchen environments.

  3. 03

    Blocked ventilation clearances

    Wiring / connection

    Insufficient clearance around the oven or objects placed against ventilation openings can prevent proper heat dissipation. Check that the installation meets the required clearances on all sides and that vents are not obstructed.

  4. 04

    Relay board internal fault

    Part replacement

    A faulty relay board may generate excessive heat on its own due to a failing relay or internal component, contributing to elevated ambient temperatures in the electronics area. This is typically identified after ruling out airflow and installation issues.

  5. 05

    Heat shield or insulation damage

    Part replacement

    Damaged or missing heat shielding between the oven cavity and the electronics compartment can allow abnormal heat transfer into the relay board area. Inspect accessible shielding for gaps, displacement, or physical damage.

See the test procedure for each cause

Frequently asked questions about C33

What does C33 mean on a Dacor oven?
C33 means the relay board has detected an ambient temperature above 80°C in the electronics area of the oven. As a protective response, the oven shuts down and activates the cooling fans. The oven will not operate again until the temperature around the relay board drops to 50°C. This is a thermal protection feature designed to prevent permanent damage to the control electronics.
Can I reset a C33 error on my Dacor oven to clear it?
The C33 condition does not clear through a simple reset while the electronics remain hot. The oven is designed to resume operation automatically once the relay board ambient temperature falls back to 50°C. Cutting power and restoring it will not bypass this requirement, as the thermal condition must physically resolve first. Allow the cooling fans to run until they stop on their own before attempting to use the oven again.
Is it safe to use my Dacor oven after a C33 error?
Once the oven has cooled and the error has cleared, it is generally safe to use for a single additional cooking cycle. However, if C33 appears repeatedly, you should stop using the oven and investigate the root cause before continuing. Repeated overheating of the relay board can cause permanent damage to the control electronics, leading to more costly repairs. A technician should inspect the cooling fans and ventilation before further use if the error recurs.
How much does it cost to fix a C33 error on a Dacor oven?
Repair costs depend heavily on the root cause. If the issue is a blocked vent or installation clearance problem, there may be no parts cost at all. A replacement cooling fan typically runs in the range of $50 to $150 for the part, plus labor. If the relay board itself needs replacement, parts alone can range from $150 to $400 or more depending on the model, with additional labor costs on top of that.
Why does my Dacor oven keep showing C33 after self-clean cycles?
Self-clean cycles run at very high temperatures for extended periods, which places maximum thermal stress on the electronics cavity. If the cooling fans are even slightly degraded, or if kitchen ventilation is poor, this extra heat load can push relay board temperatures past the 80°C threshold. Check that the area around the oven has adequate clearance and that the cooling fans are spinning freely and at full speed. Repeated C33 errors after self-clean cycles often point to a cooling fan that is beginning to fail.

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