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Error code reference

Thermador Cooktop Error Code F0323

Overheating of the electronics of the right ADB induction module: electronic components

Thermador codesThermador cooktop codes

Overheating of the electronics of the right ADB induction module: electronic components — hobs switched off to prevent overheating.

First step from the service manual

Switch off the appliance and leave it to cool down for 20-30 minutes.

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

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What F0323 means on a Thermador cooktop

The F0323 error code on a Thermador induction cooktop indicates that the electronics within the right ADB (Analog Digital Board) induction module have reached a critical temperature threshold. As a protective measure, the cooktop automatically shuts off the affected hobs to prevent thermal damage to the sensitive electronic components housed within that module. The ADB induction module contains power electronics, including IGBT transistors and control circuitry, that generate heat during normal operation and rely on adequate thermal management to function safely.

Overheating of the ADB module electronics is typically caused by conditions that either increase heat generation or restrict heat dissipation. Prolonged high-power cooking sessions, simultaneous use of multiple burners, or using oversized cookware that concentrates heat in one zone are common triggers. Inadequate ventilation around or beneath the cooktop can also prevent the cooling system from keeping electronics within safe operating temperatures.

In some cases, the fault may point to a failing cooling fan that is no longer moving sufficient airflow across the module's heat sink, or a partial blockage in the ventilation path. If the error returns quickly after the unit cools down and restarts, a faulty thermistor providing inaccurate temperature readings to the control board, or a degraded ADB module itself, may be responsible. Persistent or recurring F0323 codes warrant a closer inspection of the cooling system and the module's condition.

Source: manufacturer service documentation.

Common causes of F0323

  1. 01

    Blocked or restricted ventilation

    Wiring / connection

    Obstructions around the cooktop's air intake or exhaust vents prevent adequate airflow across the ADB module, causing heat to build up rapidly. Check that the cooktop is properly installed with required clearances and that no debris is blocking the vents.

  2. 02

    Prolonged high-power use

    Wiring / connection

    Extended cooking sessions at maximum power levels on multiple burners simultaneously can push the module's electronics beyond their thermal limits. Reducing cooking intensity or allowing rest periods between heavy use sessions may prevent recurrence.

  3. 03

    Failing or seized cooling fan

    Part replacement

    The cooling fan responsible for drawing air across the ADB module's heat sink may be operating at reduced speed or has stopped entirely. You can often hear whether the fan is running during operation; no fan noise or sluggish airflow is a strong indicator.

  4. 04

    Faulty temperature sensor or thermistor

    Part replacement

    A defective thermistor within the right ADB module may report falsely elevated temperatures to the control system, triggering the overheat shutoff even when actual temperatures are within normal range. This is diagnosed by checking sensor resistance values against specifications.

  5. 05

    Degraded or failed right ADB induction module

    Part replacement

    Internal component degradation within the ADB module itself, such as failing capacitors or IGBT transistors, can cause excessive heat generation during operation. If all other causes are ruled out and the error persists, module replacement is likely necessary.

See the test procedure for each cause

Frequently asked questions about F0323

What does F0323 mean on a Thermador cooktop?
F0323 indicates that the electronics inside the right ADB induction module have overheated. The cooktop automatically shuts off the hobs in that zone as a protective measure to prevent damage to the electronic components. This is a thermal safety response built into the appliance. Allowing the unit to cool down fully is the required first step before investigating further.
Will turning the cooktop off and back on clear the F0323 error?
Switching the cooktop off and allowing it to cool for 20 to 30 minutes will often clear the F0323 code if the overheat was caused by a temporary condition such as heavy use or a short-term ventilation issue. However, if the underlying problem is a failing fan, a faulty sensor, or a damaged ADB module, the error will return during normal use. A reset that does not hold is a signal that professional diagnosis is needed.
Is it safe to keep using the cooktop when F0323 appears?
No. When F0323 is displayed, the cooktop has already shut off the affected hobs as a safety measure, and you should not attempt to override or bypass this protection. Continuing to operate the cooktop without resolving the underlying cause risks permanent damage to the ADB module electronics. Allow the unit to cool completely before any further use, and investigate the cause if the error recurs.
How much does it cost to repair a Thermador cooktop showing F0323?
Repair costs vary depending on the root cause. If the fix is simply clearing a ventilation blockage or adjusting usage habits, there may be no parts cost at all. Cooling fan replacement typically runs in the range of $100 to $250 including parts and labor. Replacement of the right ADB induction module is more involved and can range from $300 to $700 or more depending on parts availability and labor rates in your area.
What should I check before calling a technician for F0323?
Start by turning the cooktop off and letting it cool for at least 20 to 30 minutes. Once cooled, verify that the ventilation clearances around the cooktop are not obstructed by cabinets, walls, or accumulated debris. Listen for the cooling fan when you restart the unit; if you do not hear it running, that is a strong clue. If the error returns quickly after a full cooldown, or if you notice the fan is not operating, contact a qualified technician to inspect the cooling system and the right ADB module.

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