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Error code reference

Thermador Cooktop Error Code E033A

Right ADB error checking induction module component: inductor activation relay

Thermador codesThermador cooktop codes

Right ADB error checking induction module component: inductor activation relay — cannot connect/disconnect one of the inductors.

First step from the service manual

Using tool 15000560, identify specific faulty inductors via 'Inductor test' step, then check inductor connections to ADB.

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

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What E033A means on a Thermador cooktop

Error code E033A on a Thermador induction cooktop points to a fault in the right ADB (Automated Drive Board) related to the inductor activation relay. Specifically, the control system has detected that one or more inductors on the right side of the cooktop cannot be properly connected or disconnected by the relay circuit. The ADB is the control module responsible for energizing and de-energizing the induction coils (inductors) that generate the electromagnetic field for cooking. When the relay fails to respond correctly, the board cannot confirm proper switching of the inductor circuit, triggering this fault.

The root cause is typically an open or failed relay on the ADB, a broken or corroded wire connection between the ADB and one or more inductors, or a fault within the inductor coil itself. Because the error code points specifically to the right ADB and its relay logic, the fault is localized to the right cooking zone circuitry rather than the entire cooktop. Diagnosis requires the use of Thermador diagnostic tool 15000560 to run the built-in Inductor Test routine, which isolates exactly which inductor or inductors are failing to activate or deactivate on command.

After identifying the specific faulty inductor using the diagnostic tool, the technician should carefully inspect all wiring harness connections between the ADB and the flagged inductor. Loose, corroded, or damaged connector pins are common culprits. If connections are intact, the ADB relay circuit or the inductor coil assembly itself may need to be replaced.

Source: manufacturer service documentation.

Common causes of E033A

  1. 01

    Failed inductor activation relay on the ADB

    Part replacement

    The relay on the right ADB responsible for switching one or more inductors may have failed open or closed, preventing proper connection or disconnection of the inductor circuit. This is the most direct cause aligned with the error definition.

  2. 02

    Loose or damaged wiring connections to the inductor

    Wiring / connection

    Corroded, loose, or broken connector pins between the ADB and the inductor coil can interrupt the switching signal. Inspect the full wiring harness from the ADB to each right-side inductor for damage or poor seating.

  3. 03

    Faulty inductor coil assembly

    Part replacement

    An internally damaged or shorted inductor coil can prevent the relay from completing the circuit correctly, causing the ADB to report a connection failure. Use diagnostic tool 15000560 to confirm which inductor is flagged before replacing.

  4. 04

    Damaged or defective right ADB

    Part replacement

    If the relay driver circuitry on the ADB itself has failed beyond just the relay component, the entire board may need replacement. This is typically confirmed after ruling out wiring and inductor issues.

  5. 05

    Intermittent contact at the ADB connector

    Wiring / connection

    Vibration or heat cycling can cause the ADB board connectors to develop intermittent contact, producing relay switching errors that are not caused by a hard component failure. Reseating all connectors at the board is a low-cost first step.

See the test procedure for each cause

Frequently asked questions about E033A

What does E033A mean on a Thermador cooktop?
E033A indicates that the right ADB (Automated Drive Board) has detected a fault with the inductor activation relay, meaning the control system cannot properly connect or disconnect one of the right-side induction coils. This prevents normal operation of the affected cooking zone. The error requires diagnostic testing with tool 15000560 to identify which specific inductor is involved before repairs can be made.
Can I fix E033A on my Thermador cooktop myself?
Basic checks such as reseating wiring harness connectors may be within reach for a skilled DIYer, but fully diagnosing this error requires the Thermador-specific diagnostic tool 15000560 to run the Inductor Test and identify the faulty component. Replacing an ADB or inductor coil assembly involves working with high-voltage induction circuitry, which carries serious safety risks. Most homeowners should have a qualified appliance technician perform this repair.
Is it safe to keep using my cooktop when E033A is displayed?
It is not recommended to continue using the affected right-side cooking zones while E033A is active. The fault indicates the control board cannot reliably switch the inductor on or off, which could result in unpredictable behavior from that zone. Other zones not associated with the fault may still function, but the safest approach is to stop using the cooktop until the issue is resolved.
Will resetting the cooktop clear the E033A error?
A power reset may temporarily clear the display, but because E033A is caused by a hardware fault in the relay or inductor circuit, the error will return as soon as the cooktop attempts to activate the affected inductor. Resetting does not repair the underlying wiring, relay, or component issue. A proper repair is required to permanently resolve the code.
How much does it cost to repair a Thermador cooktop E033A error?
Repair costs vary depending on which component has failed. A wiring repair or connector reseating may involve only a service call fee, typically in the range of $100 to $200. Replacing an inductor coil or the right ADB can bring total costs to anywhere between $300 and $700 or more, depending on parts pricing and labor rates in your area. Getting a diagnostic assessment first will help narrow down the actual parts needed.

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