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Error code reference

Thermador Cooktop Error Code E033C

Right ADB error checking induction module component: NTC selection circuit

Thermador codesThermador cooktop codes

Right ADB error checking induction module component: NTC selection circuit — faulty ADB.

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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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What E033C means on a Thermador cooktop

Error code E033C on a Thermador induction cooktop indicates a fault detected within the right ADB (Analog Distribution Board) specifically involving the NTC selection circuit. The NTC (Negative Temperature Coefficient) thermistor selection circuit is responsible for routing temperature sensor signals from the induction zone to the control system. When the ADB cannot properly process or select the correct NTC input, the board's internal diagnostic routine flags this as a component-level fault and triggers the E033C code. This is treated as an internal board failure rather than a wiring or sensor issue upstream of the board.

The ADB, also referred to as the relay board, manages power switching and signal monitoring for the induction modules on its assigned side of the cooktop. The NTC selection circuit within the ADB reads thermistor data to monitor cooking zone temperatures and prevent thermal overload. A fault in this circuit can stem from a degraded internal component on the board, a short or open within the board's NTC multiplexing circuitry, or general board failure due to heat stress or electrical surge. Because the fault is diagnosed as internal to the ADB itself, component-level board repair is typically not practical.

The primary and recommended first diagnostic step is direct replacement of the right relay board (ADB). Before replacing the board, technicians should verify that the NTC thermistor sensors connected to the board are not shorted or open, as an extreme sensor fault could stress the selection circuit. However, if sensors test within normal resistance ranges and the error persists, the ADB itself is the confirmed failed component and must be replaced to restore proper cooktop operation.

Source: manufacturer service documentation.

Common causes of E033C

  1. 01

    Failed right ADB (relay board)

    Part replacement

    The NTC selection circuit inside the right ADB has failed internally, which is the most common and direct cause of E033C. Board replacement is the prescribed repair.

  2. 02

    Heat stress or thermal damage to the ADB

    Part replacement

    Prolonged exposure to high temperatures from the induction zone can degrade solder joints or internal components on the ADB over time. Inspect the board for visible discoloration, burnt components, or damaged traces.

  3. 03

    Electrical surge or spike damage

    Part replacement

    A voltage surge from the power supply can damage the sensitive analog circuitry on the ADB, including the NTC selection circuit. This type of damage is internal and not repairable at the component level.

  4. 04

    Shorted or open NTC thermistor sensor

    Part replacement

    An NTC sensor with a severe resistance fault, either shorted to ground or open circuit, can overload or confuse the ADB selection circuit. Test each NTC thermistor connected to the right ADB before replacing the board to rule this out.

  5. 05

    Loose or corroded connector at the ADB

    Wiring / connection

    A poor connection between the NTC sensor wiring harness and the ADB can cause intermittent signal errors that trigger E033C. Inspect connector pins for corrosion, bent contacts, or incomplete seating.

See the test procedure for each cause

Frequently asked questions about E033C

What does E033C mean on a Thermador cooktop?
E033C indicates a fault in the NTC selection circuit within the right ADB (relay board) of your Thermador induction cooktop. The NTC selection circuit routes temperature sensor signals from the right-side induction zones to the cooktop's control system. This error is classified as an internal ADB component failure, and the right relay board typically needs to be replaced to resolve it.
Can I fix E033C myself, or do I need a technician?
Replacing the right ADB relay board requires disconnecting the cooktop from power, accessing internal components, and handling wiring harnesses connected to the board. While a skilled DIYer comfortable with appliance repair may be able to perform this replacement, it is recommended to have a qualified appliance technician handle the repair due to the electrical complexity of induction cooktops and the need to correctly identify the right board.
Is it safe to keep using my Thermador cooktop while E033C is displayed?
It is not advisable to continue using the cooktop when E033C is active. This fault affects the temperature monitoring circuit for the right-side induction zones, which means thermal protection for those zones may not be functioning correctly. Operating the cooktop in this condition could pose a risk of overheating without proper safeguard intervention.
Will resetting the cooktop clear the E033C error code?
A power reset, such as turning off the breaker for a few minutes and restoring power, may temporarily clear the error display. However, because E033C points to an internal hardware fault on the ADB, the error will almost certainly return during normal operation until the faulty board is replaced. Resetting is not a repair for this code.
How much does it cost to fix a Thermador cooktop showing E033C?
Repair costs for E033C will vary depending on the specific cooktop model and your location, but you should expect to factor in both the cost of the replacement right ADB relay board and labor for a service technician. Parts alone for an ADB relay board on a Thermador induction cooktop typically fall in the range of $150 to $400, with total repair costs including labor often ranging from $250 to $600 or more.

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