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Error code reference

Dacor Range Oven Cooktop Error Code C72

Communication error

Dacor codesDacor range oven cooktop codes

Communication error - no communication between logic and relay boards.

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Get the full diagnostic procedure for C72.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What C72 means on a Dacor range oven cooktop

The C72 error code on Dacor ranges, ovens, and cooktops indicates a communication failure between the logic board and the relay board. These two boards work in tandem to control the appliance: the logic board (also called the control board) sends commands and receives feedback, while the relay board receives those signals and switches power to heating elements, igniters, and other loads. When the internal communication link between these two boards breaks down, the appliance cannot safely execute cooking functions and displays C72 to alert the technician or user.

The most common root causes of this fault involve the wiring harness that connects the two boards. Loose connectors, broken wire terminals, or harness damage from heat exposure can all interrupt the signal path. The boards communicate over a dedicated data line, so even a single broken pin or intermittent connection can cause the error to appear. In some cases, one of the boards itself has failed, either due to a power surge, a component failure on the board, or physical damage.

Diagnosing C72 requires a systematic inspection of the interconnecting wiring harness, confirming that all connectors are fully seated and free of corrosion or burn marks, and then evaluating each board individually. If the wiring checks out, the relay board or logic board will need to be tested and likely replaced. Because this error disables core appliance functions, it should be resolved before continued use.

Source: manufacturer service documentation.

Common causes of C72

  1. 01

    Loose or disconnected wiring harness

    Wiring / connection

    The cable connecting the logic board and relay board may have worked loose from its connector. Inspecting both ends of the harness for fully seated plugs is the first physical check to perform.

  2. 02

    Damaged or burned wiring harness

    Part replacement

    Heat exposure inside the appliance cavity can degrade wire insulation, melt connector pins, or break individual conductors. Look for discoloration, melted plastic, or broken wires along the harness route.

  3. 03

    Failed relay board

    Part replacement

    The relay board may have suffered an internal component failure, preventing it from receiving or responding to signals from the logic board. This often follows a power surge or prolonged high-heat exposure.

  4. 04

    Failed logic board

    Part replacement

    The logic board itself may have failed and is no longer transmitting communication signals to the relay board. This is less common than relay board failure but should be considered if the wiring and relay board both check out.

  5. 05

    Corroded or oxidized connector terminals

    Wiring / connection

    Moisture or grease contamination on the board-to-board connector pins can increase resistance on the communication line enough to drop the signal. Clean or replace affected connectors if corrosion is visible.

See the test procedure for each cause

Frequently asked questions about C72

What does C72 mean on a Dacor range, oven, cooktop?
C72 indicates a communication failure between the logic board and the relay board inside the appliance. These two boards must exchange signals for the appliance to control heating elements and other functions. When that communication link is broken, the appliance displays C72 and stops operating normally. The fault can be caused by wiring issues or a failed board.
Can I fix the C72 error myself?
A knowledgeable DIYer can start by unplugging the appliance and checking that the harness connectors between the logic and relay boards are fully seated and free of visible damage. However, if the wiring looks intact, diagnosing which board has failed typically requires component-level testing that most homeowners are not equipped to perform. Board replacement also involves working near high-voltage components, so professional service is recommended if the basic connection check does not resolve the issue.
Is it safe to use my Dacor appliance while C72 is displayed?
No, you should not use the appliance while C72 is active. The error means the control system cannot reliably communicate internally, so cooking functions may not respond correctly or may behave unpredictably. Continued use before the fault is repaired risks unsafe operation or additional damage to the control boards.
Will resetting my Dacor appliance clear the C72 error?
A power reset, performed by unplugging the appliance or switching off the circuit breaker for a few minutes, may temporarily clear the code if the cause was a transient communication glitch. However, if there is underlying wiring damage or a board failure, the C72 code will return once the appliance powers back up. A persistent C72 after a reset confirms a hardware fault that needs physical repair.
How much does it cost to repair a C72 error on a Dacor appliance?
Repair costs depend on which component has failed. If only a wiring harness needs repair or replacement, costs are generally in the range of $100 to $250 including labor. Replacing a relay board or logic board typically adds to that cost, with parts and labor often ranging from $250 to $600 or more depending on the specific model and local labor rates. Dacor appliances tend to have higher parts costs than budget brands, so getting a firm quote from a qualified technician before authorizing repairs is advisable.

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