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Error code reference

Thermador Cooktop Error Code E0347

Right ADB induction module has been unable to correctly detect its position in the appliance.

Thermador codesThermador cooktop codes

Right ADB induction module has been unable to correctly detect its position in the appliance.

First step from the service manual

Replace the right relay board (ADB).

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E0347 means on a Thermador cooktop

Error code E0347 on a Thermador induction cooktop indicates that the right ADB (Auxiliary Distribution Board) induction module has failed to correctly identify its position within the appliance. The ADB is a relay board that manages power distribution and communication for the induction heating elements on that side of the cooktop. During the startup or operational sequence, the control system queries each induction module to confirm its physical location within the unit. When the right ADB cannot respond with the correct positional data, the system logs E0347 and typically disables that zone to prevent uncontrolled operation.

This positional detection failure generally points to a fault within the right relay board itself rather than in external wiring or the main control board. The ADB relies on internal logic circuits to register and communicate its position. If those circuits are damaged, corrupted, or have failed due to component-level failure, the board will be unable to complete the handshake with the main controller. Power surges, heat stress from prolonged high-output cooking, or manufacturing defects can all cause this type of internal board failure.

The primary diagnostic step for E0347 is direct replacement of the right relay board (ADB). Before replacement, technicians should verify that all connectors to the right ADB are fully seated and free from corrosion or heat damage, as a poor connection can sometimes mimic a board-level fault. However, if connections are intact and the error persists, the board itself is the component at fault and must be replaced to restore correct zone operation.

Source: manufacturer service documentation.

Common causes of E0347

  1. 01

    Failed right ADB relay board

    Part replacement

    The internal logic circuits on the right ADB have failed, preventing the board from correctly reporting its position to the main controller. This is the most common cause and typically requires board replacement.

  2. 02

    Loose or disconnected ADB harness connector

    Wiring / connection

    If the wiring harness connector to the right ADB is partially unseated or has worked loose due to vibration or heat cycling, the positional communication signal can be interrupted. Inspect and firmly reseat all connectors to the right ADB before replacing the board.

  3. 03

    Corrosion or heat damage on ADB connectors

    Wiring / connection

    Prolonged heat exposure or moisture intrusion can corrode the connector pins on the right ADB, causing intermittent or complete loss of communication. Visually inspect connector pins for discoloration, oxidation, or melting.

  4. 04

    Power surge damage to ADB

    Part replacement

    A voltage spike from the supply line can damage the sensitive control circuits on the ADB, causing it to lose its ability to identify its position. This type of damage is internal to the board and is not recoverable without replacement.

  5. 05

    Main control board communication fault

    Part replacement

    In rare cases, the main control board may fail to correctly poll the right ADB for positional data, generating a false E0347. This is less likely than ADB failure itself and should only be investigated if a confirmed-good replacement ADB still produces the error.

See the test procedure for each cause

Frequently asked questions about E0347

What does E0347 mean on a Thermador cooktop?
E0347 means the right ADB induction module has been unable to correctly detect its position in the appliance. The ADB is the relay board that manages the right-side induction zones, and the cooktop's control system requires each module to confirm its location during operation. When that confirmation fails, the error is triggered and the affected zone is disabled. The most direct fix is replacement of the right relay board.
Can I fix E0347 myself, or do I need a technician?
A knowledgeable DIYer can start by checking that all wiring harness connectors to the right ADB are fully seated and undamaged, as a loose connection can sometimes trigger this code. However, if the connectors are intact and the error remains, the right relay board itself needs to be replaced, which involves working inside a high-voltage appliance. This repair is generally recommended for qualified technicians due to the risk of electric shock from residual capacitor charge in induction components.
Is it safe to keep using my cooktop with error E0347 active?
The cooktop disables the affected right-side induction zone when E0347 is present, so that zone will not operate. While the left-side zones may still function, continued use of the appliance in a fault state is not recommended. It is best to resolve the error before resuming regular cooking to ensure the appliance is operating as designed.
Will resetting the cooktop clear the E0347 error?
A power reset, such as switching off the circuit breaker for 30 seconds and restoring power, may temporarily clear the error display. However, if the right ADB relay board has a genuine internal fault or a loose connection remains unresolved, the code will return during the next startup or operation cycle. A reset does not repair the underlying hardware issue.
How much does it cost to repair a Thermador cooktop showing E0347?
Repair costs depend on whether the fix requires only reseating a connector or a full relay board replacement. A service call and board replacement for an induction cooktop ADB typically falls in the range of $200 to $600 or more, depending on parts pricing and local labor rates. Getting a diagnostic quote from a Thermador-authorized service provider will give you the most accurate estimate for your specific unit.

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