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Error code reference

Thermador Cooktop Error Code E0722

Overheating in the Active Light module

Thermador codesThermador cooktop codes

Overheating in the Active Light module — hobs are switched off to prevent overheating of the electronic module.

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 E0722 means on a Thermador cooktop

The E0722 error code on a Thermador cooktop indicates that the Active Light module has reached a critical temperature threshold. As a protective measure, the cooktop's control system automatically shuts off all hob zones to prevent thermal damage to the electronic module. The Active Light module is the control electronics assembly responsible for managing the touch interface, zone activation, and power delivery to the induction or electric elements. When internal temperature sensors within this module detect excessive heat, the E0722 fault is triggered and cooking operations are suspended until safe operating temperatures are restored.

Overheating in the Active Light module is most commonly caused by restricted airflow around or beneath the cooktop. Thermador cooktops require adequate ventilation clearances to dissipate heat generated during normal operation. If the installation cavity lacks proper spacing, or if ventilation slots are blocked by debris or grease buildup, heat accumulates in the module and triggers E0722. Extended high-power cooking sessions across multiple zones simultaneously can also push the module beyond its thermal limits, particularly in warmer ambient environments.

In some cases, E0722 can point to a cooling fan failure within the cooktop assembly. Many Thermador induction cooktops use an internal fan to actively cool the electronics during operation. If this fan is malfunctioning or has failed entirely, heat builds up rapidly in the Active Light module even under normal cooking loads. A failed thermal sensor that provides inaccurate readings can also cause false triggering of this error. Identifying whether the fault is environmental, ventilation-related, or component-related requires a systematic diagnostic approach starting with a full cooldown cycle.

Source: manufacturer service documentation.

Common causes of E0722

  1. 01

    Blocked or insufficient ventilation

    Wiring / connection

    If the cooktop's installation cavity does not provide adequate airflow clearance, or if ventilation slots are clogged with grease and debris, heat cannot escape and the Active Light module overheats. Check that all ventilation openings are clear and that installation spacing meets Thermador's specified clearances.

  2. 02

    Extended high-power cooking across multiple zones

    Wiring / connection

    Running several hob zones simultaneously at high power settings for extended periods generates significant heat that can overwhelm the module's cooling capacity. If E0722 occurs consistently during heavy cooking sessions, reducing the number of simultaneous high-power zones may prevent recurrence.

  3. 03

    Internal cooling fan failure

    Part replacement

    Thermador induction cooktops use an internal fan to actively cool the electronics during operation. A failed or seized cooling fan will cause rapid heat buildup in the Active Light module, triggering E0722 even under normal cooking loads. Listen for the fan during operation and inspect it for obstruction or motor failure.

  4. 04

    Faulty temperature sensor in the Active Light module

    Part replacement

    A defective thermal sensor within the Active Light module can report false high-temperature readings and trigger E0722 even when the module is not actually overheating. This is typically identified when the error occurs at startup or after very short cooking durations with no other thermal cause present.

  5. 05

    Failed or damaged Active Light module

    Part replacement

    If the Active Light module itself has sustained internal component damage, it may generate excessive heat during operation or fail to regulate its own temperature correctly. This is typically a diagnosis of exclusion after ventilation, fan, and sensor causes have been ruled out.

See the test procedure for each cause

Frequently asked questions about E0722

What does E0722 mean on a Thermador cooktop?
E0722 indicates that the Active Light module, which is the cooktop's main electronic control assembly, has overheated. The cooktop automatically shuts off all hob zones when this happens to prevent damage to the electronics. It is a protective fault, not necessarily a sign of a failed component. Allowing the unit to cool down fully is the first step in resolving it.
How do I fix the E0722 error on my Thermador cooktop?
Start by switching the cooktop off completely and allowing it to cool for 20 to 30 minutes. After the cooldown period, check that all ventilation openings around and beneath the cooktop are clear of grease, debris, and obstructions. If the error returns quickly after resuming use, the internal cooling fan or a temperature sensor may need inspection and replacement by a qualified technician.
Is it safe to keep using my cooktop when E0722 appears?
No, you should stop using the cooktop immediately when E0722 appears. The cooktop will have already shut off the hob zones automatically as a safety measure. Continuing to attempt to operate the appliance before it has fully cooled could cause permanent damage to the Active Light module. Wait the full 20 to 30 minutes before restarting.
Will resetting the cooktop clear the E0722 error?
Switching the appliance off and allowing a full 20 to 30 minute cooldown will often clear E0722 if the cause was a temporary thermal event such as heavy use or a brief ventilation issue. However, if the underlying cause is a failed cooling fan, a faulty sensor, or a damaged Active Light module, the error will return after reset. A reset alone is not a fix if a component has failed.
How much does it cost to repair an E0722 error on a Thermador cooktop?
Repair costs vary depending on the root cause. If the fix is simply clearing blocked ventilation, there may be no parts cost and only a service call fee, which typically ranges from $75 to $150. If the internal cooling fan needs replacement, parts and labor combined often range from $150 to $350. Replacement of the Active Light module is the most expensive scenario, with total repair costs potentially ranging from $300 to $700 or more depending on the model and labor rates in your area.

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