mypros+
Error code reference

Dacor Oven Error Code C43

Wire connection error at control and/or relay board

Dacor codesDacor oven codes

Wire connection error at control and/or relay board – not all pin connectors from the wire harness are making contact with their respective terminals.

First step from the service manual

Check to make sure that all pins are seated properly into the Molex plug and that each connector is properly making contact with the correct terminal at the control and/or relay board.

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

MyPros+ Max

Get the full diagnostic procedure for C43.

  • 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
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What C43 means on a Dacor oven

The C43 error code on a Dacor oven indicates a wire connection fault between the control board and the relay board. Specifically, the oven's control system has detected that one or more pin connectors within the wire harness are not making proper electrical contact with their corresponding terminals. These connections are made through Molex-style multi-pin connectors, and when even a single pin fails to seat fully or loses contact, the communication or power pathway between boards is interrupted, triggering the fault.

This type of error is distinct from a failed component. The boards themselves may be fully functional, but the electrical signal cannot pass reliably because of a physical connection issue. Common contributors include pins that were not fully pressed into the Molex housing during a previous repair, connectors that have worked loose due to vibration over time, or terminals that have developed corrosion or heat-induced deformation. In some cases, a pin may appear seated but has actually backed out slightly from the connector housing, which prevents proper contact.

Diagnosing C43 begins with a careful physical inspection of all wire harness connectors at both the control board and the relay board. Each pin should be checked for full insertion into its Molex plug, and each connector should be verified to be fully engaged with the correct terminal on the board. Bent pins, spread terminals, or connectors inserted into the wrong port will all produce the same fault condition.

Source: manufacturer service documentation.

Common causes of C43

  1. 01

    Incompletely seated Molex pin

    Wiring / connection

    A pin within the wire harness connector may not be fully pressed into the Molex housing, preventing reliable contact. This can occur after any service event where connectors were disconnected and reconnected.

  2. 02

    Loose or disconnected harness connector at the board

    Wiring / connection

    The entire connector block may have worked loose from its terminal on the control or relay board due to vibration or thermal cycling. Inspect each connector for a firm, fully engaged fit at the board.

  3. 03

    Corroded or oxidized pin terminals

    Wiring / connection

    Moisture or high heat exposure can cause pin terminals to oxidize, increasing resistance at the contact point to the point where the connection is effectively lost. Look for discoloration or pitting on the metal pins.

  4. 04

    Bent or deformed pin

    Part replacement

    A pin inside the Molex connector may be bent, spread, or damaged, preventing it from making contact with the corresponding terminal even when the connector appears fully seated.

  5. 05

    Connector inserted into the wrong terminal port

    Wiring / connection

    If a harness connector was reinstalled into an incorrect port on the control or relay board following a repair, the C43 fault can result. Verify each connector is matched to its correct terminal location.

See the test procedure for each cause

Frequently asked questions about C43

What does C43 mean on a Dacor oven?
C43 on a Dacor oven indicates a wire connection error between the control board and the relay board. The fault is triggered when one or more pins in the wire harness connectors are not making proper contact with their terminals. This is typically a physical connection issue rather than a failed board or component. Inspecting and reseating all Molex connectors at both boards is the recommended first step.
Can I fix the C43 error myself, or do I need a technician?
A knowledgeable homeowner comfortable working inside appliances can attempt to fix C43 by carefully inspecting all wire harness connectors at the control and relay boards and reseating any that are loose or improperly inserted. However, if pins are bent or damaged, or if the connectors are difficult to access safely, a qualified appliance technician is the better choice. Always disconnect power to the oven before opening any panels.
Is it safe to use my Dacor oven while the C43 code is displayed?
It is not advisable to continue using the oven while C43 is active. A faulty connection between the control and relay boards can result in unpredictable oven behavior, including incorrect temperature regulation or failure to control heating elements properly. The oven should be powered off and inspected before resuming normal use.
Will resetting the oven clear the C43 error code?
Resetting the oven by cutting power at the breaker may temporarily clear the C43 code, but the error will return if the underlying connection issue is not corrected. The fault is caused by a physical wiring problem, not a software glitch, so the reset alone does not resolve it. The harness connectors at the control and relay boards must be inspected and properly seated for the fix to hold.
How much does it cost to repair a C43 error on a Dacor oven?
If the issue is simply a loose or improperly seated connector, repair costs may be minimal, covering only a service call fee which typically ranges from $75 to $150 depending on your region. If a damaged wire harness or connector housing needs to be replaced, parts and labor together could range from $150 to $400 or more. Because C43 often involves only a connection reseating rather than part replacement, it tends to be on the lower end of appliance repair costs.

Related Dacor oven codes

All Dacor oven codes
View all 71 Dacor oven codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass