Thermador Cooktop Error Code E0243

E0243 means the power board has encountered an error while trying to measure the supply voltage on the left filter board side of the induction module using its A/D supply voltage converter. The cooktop's control system relies on this measurement to confirm safe operating conditions, and when the measurement fails, the unit displays this code and stops operating. The fault can originate from the incoming supply voltage, the left filter board, or the power board's own sensing circuitry.

No. The cooktop displays E0243 because it cannot confirm that supply voltage is within safe operating parameters. Continuing to attempt use while this error is active could pose a risk of electrical damage to the unit. The cooktop should remain out of service until the underlying cause is diagnosed and corrected.

Repair costs depend on which component is at fault. If the issue is limited to wiring or a connection problem, labor costs may be relatively low, typically in the range of $100 to $200. Replacing the left filter board or the power board can bring the total repair cost to somewhere between $250 and $600 or more, depending on parts pricing and labor rates in your area.

The first step, checking the available supply voltage at the cooktop's connection point, can be performed by a knowledgeable DIYer with a multimeter and proper electrical safety precautions. However, diagnosing and replacing internal components such as the filter board or power board involves working with high-voltage induction circuitry and is best handled by a qualified appliance repair technician.

A power reset by turning off the circuit breaker for a few minutes may temporarily clear the error display, but if the underlying fault in the voltage sensing circuit, the filter board, or the supply voltage itself has not been resolved, the code will return when the unit powers back on. A reset alone is not a repair.