Thermador Cooktop Error Code E0248

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.

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.

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.

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.

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.