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Error code reference

Dacor Oven Error Code C90

Power loss

Dacor codesDacor oven codes

Power loss - power was interrupted and restored.

First step from the service manual

Press any key on the control panel to clear and run normally.

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 oven

The C90 code on a Dacor oven is an informational status code indicating that the oven experienced a loss of electrical power and has since been restored. This is not a fault in the traditional sense, meaning no component has failed and no safety issue has been detected. Instead, the control board is alerting the user that a power interruption occurred, which caused the oven to lose its operational state, any active cooking programs, and the clock setting.

The control board monitors incoming power continuously. When power drops below the threshold required to maintain board operation and then returns, the board logs this event and displays C90 to notify the user. This behavior is by design, ensuring that any cooking cycle that was interrupted does not silently resume without the user's awareness, which could present a food safety concern if the oven had been mid-cycle during the outage.

Common triggers include brief household power outages, utility grid fluctuations, a tripped circuit breaker, or a loose connection at the wall outlet or junction box. In most cases, the event is external to the oven itself and no internal component is at fault. If C90 appears repeatedly without any known power outages occurring, it may point to an unstable power supply to the unit, a failing connection at the terminal block, or an issue with the household electrical circuit feeding the oven.

Source: manufacturer service documentation.

Common causes of C90

  1. 01

    Household power outage

    Wiring / connection

    A brief or extended loss of utility power is the most frequent cause of C90. Check whether other appliances or lights in your home lost power around the same time.

  2. 02

    Tripped circuit breaker

    Wiring / connection

    If the dedicated circuit breaker for the oven tripped and then reset on its own or was manually reset, the oven will display C90 on the next power-up. Check the breaker panel for any breakers that are in the middle position or were recently reset.

  3. 03

    Loose or intermittent power connection

    Wiring / connection

    A loose connection at the oven's terminal block, wall outlet, or power cord can cause momentary power drops that trigger C90 even without a full outage. If the code appears repeatedly with no known outage, inspect all wiring connections for tightness and corrosion.

  4. 04

    Voltage fluctuation from the utility supply

    Wiring / connection

    Unstable grid power, particularly in areas prone to voltage sags or spikes, can cause the control board to register a power interruption. If this is recurring and no wiring issues are found, a licensed electrician should evaluate the incoming line voltage.

  5. 05

    Failing control board

    Part replacement

    In rare cases where C90 appears repeatedly and all external power sources check out as stable, the control board itself may be incorrectly logging power loss events. This would require board inspection and possible replacement.

See the test procedure for each cause

Frequently asked questions about C90

What does C90 mean on a Dacor oven?
C90 is a notification code indicating that the oven's power was interrupted and has since been restored. The control board displays this alert so the user is aware that any active cooking program was cancelled during the outage. It is not a component failure code and does not indicate a malfunction within the oven itself.
How do I clear the C90 code on my Dacor oven?
Press any key on the control panel to clear the C90 code. Once cleared, the oven will return to normal operation. You will also need to reset the clock, as the time is lost whenever power is interrupted.
Is it safe to use my Dacor oven after a C90 code appears?
Yes, it is safe to use the oven after a C90 code. The code is purely informational and does not indicate a safety hazard or a fault with any internal component. Simply clear the code and resume normal use.
Will resetting the oven clear the C90 code permanently?
Pressing any key clears the C90 code immediately, and it will not return unless another power interruption occurs. If the code keeps coming back without a known outage, the underlying cause is likely an unstable power connection or circuit issue that should be investigated.
How much does it cost to fix a C90 error on a Dacor oven?
In most cases, clearing C90 costs nothing because it only requires pressing a key after a power outage. If the code is caused by a loose wiring connection, an electrician's service call typically runs in the range of $75 to $200 depending on your area. If a control board replacement is ultimately needed, parts and labor costs generally range from $300 to $600 or more for a Dacor unit.

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