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Error code reference

Thermador Cooktop Error Code E013D

Left ADB error checking induction module component: relay activation circuit

Thermador codesThermador cooktop codes

Left ADB error checking induction module component: relay activation circuit — faulty ADB.

First step from the service manual

Replace the left relay board (ADB).

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

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  • 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 E013D means on a Thermador cooktop

Error code E013D on a Thermador induction cooktop indicates a fault detected within the left ADB (Activator Driver Board) during a self-check of the relay activation circuit. The ADB is the control board responsible for driving the relay that switches power to the left induction zone's power electronics. When the cooktop's diagnostic routine runs this self-check, it expects specific feedback confirming the relay circuit is functioning within acceptable parameters. If that confirmation is absent or out of range, E013D is logged and the affected zone is disabled as a protective measure.

The relay activation circuit on the ADB controls when high-current power is supplied to the induction coil assembly. A failure in this circuit can stem from a burned or welded relay contact, a failed driver transistor on the board, a broken trace in the relay trigger path, or internal component degradation due to heat cycling over time. Because the fault is isolated to the ADB itself rather than an upstream wiring harness or power supply issue, the diagnostic path points directly to board-level failure.

The recommended first diagnostic action is replacement of the left relay board (ADB). Before replacement, a technician should inspect the board visually for signs of scorching, swollen capacitors, or discolored relay housings, and verify that the harness connectors seating into the ADB show no corrosion or heat damage. If connectors and wiring check out cleanly, the ADB itself is the confirmed fault point and should be replaced to restore normal operation of the left induction zone.

Source: manufacturer service documentation.

Common causes of E013D

  1. 01

    Failed ADB relay activation circuit

    Part replacement

    The relay driver circuit on the left ADB has failed internally, which is the primary fault this error code identifies. This is a board-level failure and requires replacing the ADB.

  2. 02

    Burned or welded relay contacts on the ADB

    Part replacement

    Repeated high-current switching can cause relay contacts to weld together or burn open. Visible scorching or discoloration near the relay on the board is a telltale indicator.

  3. 03

    Heat-damaged components on the ADB

    Part replacement

    Prolonged thermal stress from cooking cycles can degrade transistors, capacitors, or board traces involved in the relay trigger path. Swollen capacitors or darkened board areas may be visible on inspection.

  4. 04

    Corroded or loose ADB harness connectors

    Wiring / connection

    Corrosion or a poor connection at the wiring harness plugs leading to the ADB can cause intermittent or failed signal delivery to the relay circuit. Inspect connector pins for oxidation or heat damage before condemning the board.

See the test procedure for each cause

Frequently asked questions about E013D

What does E013D mean on a Thermador cooktop?
E013D means the cooktop's self-diagnostic routine has detected a fault in the relay activation circuit of the left ADB, which is the Activator Driver Board controlling the left induction zone. The board is responsible for triggering the relay that supplies power to the left burner. When this circuit fails its check, the cooktop logs E013D and disables that zone. The ADB itself is identified as the faulty component.
Can I fix E013D myself, or do I need a technician?
Replacing the left ADB is a component-level repair that involves accessing internal cooktop electronics, which carries risk of electric shock if not done with the unit fully disconnected from power. Technicians with experience in induction cooktop servicing are best suited for this repair. A knowledgeable DIYer comfortable with appliance electronics can perform it, but safety precautions around high-voltage capacitors in induction systems must be followed carefully.
Is it safe to use my Thermador cooktop while E013D is displayed?
The left induction zone affected by E013D should be considered non-operational and should not be relied upon while the fault is active. The cooktop disables the faulted zone as a protective measure. Other zones may continue to function, but it is best to have the fault resolved before using the unit extensively to avoid further component damage.
Will resetting the cooktop clear the E013D error code?
A power reset may temporarily clear the error display, but because E013D reflects a hardware fault within the ADB relay activation circuit, the code will return once the cooktop runs its self-diagnostic again. A reset does not repair the underlying board-level failure. Permanent resolution requires replacing the left ADB.
How much does it cost to repair a Thermador cooktop showing E013D?
Repair costs depend on parts pricing and labor rates in your area. The left ADB replacement part itself typically falls in the range of $150 to $400 depending on the specific cooktop model. Adding professional labor, total repair costs generally range from $250 to $600 or more. Getting a quote from an authorized service provider before proceeding is recommended.

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