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Error code reference

Thermador Cooktop Error Code E0248

Power board error checking induction module component: A/D supply voltage converter

Thermador codesThermador cooktop codes

Power board error checking induction module component: A/D supply voltage converter — error measuring the supply voltage (right filter board side).

First step from the service manual

Check the available supply voltage.

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

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What E0248 means on a Thermador cooktop

Error code E0248 on a Thermador induction cooktop indicates a fault in the power board's analog-to-digital (A/D) supply voltage converter specifically on the right filter board side. The power board continuously monitors the supply voltage feeding the induction module using an A/D converter circuit. When this measurement process fails or returns a value outside the expected parameters, the control system logs E0248 and typically disables the affected induction zone or the entire cooktop to prevent operation under potentially unsafe electrical conditions.

The right filter board is responsible for conditioning the incoming AC power before it reaches the induction module. It filters electrical noise, manages power factor, and routes voltage to the induction components. The A/D converter on the power board samples this conditioned supply voltage and converts the analog reading into a digital signal the control board can interpret. A failure in this measurement chain can originate from a fault in the filter board itself, degraded wiring or connectors between the filter board and power board, or a failed A/D converter circuit on the power board.

The first diagnostic step is to verify that the supply voltage arriving at the cooktop is within the required specification. Low voltage, voltage imbalance, or complete loss of one leg on a multi-phase supply can cause the A/D circuit to read an out-of-range value and trigger this error. After confirming proper supply voltage, the diagnostic focus should shift to the right filter board, the interconnecting harness, and the power board itself.

Source: manufacturer service documentation.

Common causes of E0248

  1. 01

    Inadequate or unstable supply voltage

    Wiring / connection

    If the incoming line voltage is too low, too high, or unstable, the A/D converter circuit will return an out-of-range reading. Check the voltage at the cooktop's terminal block or dedicated circuit breaker with a multimeter to confirm it matches the required specification.

  2. 02

    Faulty right filter board

    Part replacement

    The right filter board conditions the incoming supply voltage before it is measured. A failed capacitor, burned trace, or damaged filter component on this board can disrupt the voltage signal fed to the A/D converter on the power board.

  3. 03

    Damaged wiring harness or connector between filter board and power board

    Wiring / connection

    A loose, corroded, or broken connector pin in the harness linking the right filter board to the power board will interrupt the voltage signal. Inspect connectors for burn marks, corrosion, or unseated pins and check for continuity in the wiring.

  4. 04

    Failed A/D converter circuit on the power board

    Part replacement

    The power board contains the A/D converter that performs the voltage measurement. If the converter circuit itself has failed due to component aging or a surge event, it will generate E0248 even when supply voltage and filter board are functioning correctly.

  5. 05

    Tripped or weak circuit breaker

    Wiring / connection

    A breaker that has partially tripped or is beginning to fail can deliver reduced or intermittent voltage to the cooktop. Reset the dedicated breaker and verify it holds under load, and check for voltage drop across the breaker terminals.

See the test procedure for each cause

Frequently asked questions about E0248

What does E0248 mean on a Thermador cooktop?
E0248 indicates that the power board detected an error while trying to measure the supply voltage on the right filter board side using its internal analog-to-digital converter. The cooktop could not confirm that the incoming voltage is within an acceptable range. This typically causes the cooktop to stop operating until the fault is resolved. The issue can originate from the home's electrical supply, the right filter board, the connecting wiring, or the power board itself.
Can I fix E0248 myself or do I need a technician?
The first step, checking your home's supply voltage and resetting the circuit breaker, can be done without special tools. However, diagnosing and replacing internal components like the right filter board or power board involves working with high-voltage induction circuitry, which carries serious risk of electric shock. Unless you are experienced with appliance electronics and high-voltage systems, it is strongly recommended to have a qualified technician perform internal repairs.
Is it safe to use my Thermador cooktop while E0248 is active?
No. E0248 reflects a fault in the voltage monitoring circuit that the cooktop relies on to operate safely. Attempting to bypass or ignore this error and continue using the cooktop could expose the induction electronics to unmonitored voltage conditions, potentially causing further component damage or creating a safety hazard. The cooktop should remain out of service until the fault is diagnosed and corrected.
Will resetting the cooktop clear the E0248 error?
A power reset, such as turning off the dedicated breaker for 30 to 60 seconds and then restoring power, may temporarily clear the error if the fault was caused by a transient voltage disturbance. However, if an underlying hardware problem exists with the right filter board, wiring harness, or power board, the error will return as soon as the cooktop attempts to measure the supply voltage again. A reset alone is not a repair.
How much does it cost to repair a Thermador cooktop with error code E0248?
Repair costs vary depending on the root cause. If only a wiring connector or harness needs attention, costs may be limited to a service call fee, typically in the range of $100 to $200. Replacing the right filter board or the power board will add parts costs on top of labor, and total repair costs for board replacement can range from $300 to $700 or more depending on parts availability and the technician's rates.

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