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Error code reference

Dacor Range Oven Cooktop Error Code C90

Power loss

Dacor codesDacor range oven cooktop codes

Power loss - clear failure code and retest cooking modes.

First step from the service manual

Clear failure code and retest cooking modes.

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

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What C90 means on a Dacor range oven cooktop

The C90 error code on Dacor ranges, ovens, and cooktops indicates a power loss event. This code is logged by the control board when the appliance detects an interruption or disruption in its power supply. The board stores this as a failure code to alert the technician or user that the unit lost power at some point during operation, which could have interrupted an active cooking cycle or caused the control system to reset unexpectedly.

Power loss events can originate from multiple sources including utility grid fluctuations, a tripped circuit breaker, a loose or faulty power connection at the terminal block, or a momentary voltage sag during high-demand periods. The control board itself is designed to log the event rather than indicate a component failure, which is why the primary diagnostic step is simply to clear the code and retest all cooking modes. If the code returns during retesting without an obvious external power disruption, further investigation into the wiring, connections, and power supply quality is warranted.

When clearing the C90 code, technicians should cycle power at the breaker, allow the control board to fully reset, then verify normal operation across all cooking modes including bake, broil, and convection if applicable. If the code reappears without a known power interruption, inspect the terminal block connections for looseness or heat damage, check the household circuit for proper voltage, and evaluate the control board for signs of failure.

Source: manufacturer service documentation.

Common causes of C90

  1. 01

    Utility power interruption or outage

    Wiring / connection

    A brief grid outage, brownout, or power surge can trigger the C90 code. Check with your utility provider or review whether other devices in the home lost power around the same time.

  2. 02

    Tripped circuit breaker

    Wiring / connection

    A tripped or partially tripped breaker on the appliance's dedicated circuit can cause a power loss event. Inspect the breaker panel and reset any tripped breakers before clearing the code.

  3. 03

    Loose or corroded terminal block connections

    Wiring / connection

    Loose wiring connections at the terminal block can cause intermittent power loss that triggers the C90 code. Inspect the terminal block for loose lugs, heat discoloration, or corrosion.

  4. 04

    Faulty power cord or supply wiring

    Part replacement

    A damaged power cord or degraded supply wiring can cause intermittent voltage drops that the control board logs as a power loss. Inspect the cord and wiring for visible damage or burn marks.

  5. 05

    Control board fault

    Part replacement

    If the C90 code returns repeatedly with no external power issue identified, the control board may be incorrectly logging or responding to phantom power loss events, indicating a potential board failure.

See the test procedure for each cause

Frequently asked questions about C90

What does C90 mean on a Dacor range, oven, cooktop?
The C90 code on a Dacor range, oven, or cooktop indicates that the appliance detected a power loss event. The control board logs this code whenever it experiences an interruption in power supply. It does not necessarily indicate a failed component. Clearing the code and retesting cooking modes is the recommended first action.
Will resetting the appliance clear the C90 code?
Yes, in most cases cycling power at the circuit breaker and then clearing the failure code through the control panel will resolve the C90 alert if the original power interruption was an isolated event. If the code returns after clearing, further diagnostics are needed to identify a recurring power supply issue.
Is it safe to use my Dacor appliance after a C90 error?
If the C90 code was caused by a one-time power interruption such as a brief outage or tripped breaker, the appliance is generally safe to use after the code is cleared and cooking modes are confirmed to work normally. If the code keeps returning, avoid extended unattended use until the underlying cause is identified.
How do I fix the C90 error code on my Dacor appliance?
Start by resetting the circuit breaker for the appliance and then clearing the C90 failure code from the control panel. Retest all cooking modes to confirm normal operation. If the code returns, inspect the terminal block connections, power cord, and household circuit voltage, as a recurring code points to an ongoing power supply problem.
How much does it cost to repair a Dacor appliance showing a C90 error?
If the C90 is caused by an external power event, there may be no repair cost at all beyond your time to reset the breaker and clear the code. If wiring repairs or a terminal block replacement are needed, costs typically range from around $75 to $200 for parts and labor. A control board replacement, if required, can range from $200 to $500 or more depending on the model.

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