Thermador Cooktop Error Code E0240

E0240 indicates that the power board detected an error while checking the induction module's input relay. The relay is responsible for switching AC power into the induction components, and the board was unable to confirm it is operating correctly. This code is functionally the same as E0236 and uses the same diagnostic approach.

No. The cooktop locks out operation when E0240 is active because the power board cannot confirm the input relay is functioning correctly. Attempting to bypass this lockout is not recommended, as the relay fault could pose a risk to the induction module and other internal components.

Repair costs depend on which component has failed. Relay replacement parts are generally in the range of $20 to $80, while a power board replacement can run between $150 and $400 or more depending on the model. Adding professional labor typically brings the total repair cost to somewhere between $200 and $600.

A power reset may temporarily clear E0240, but the code will return if the underlying fault is still present. Cycling power does not repair a failed relay, damaged wiring, or a faulty power board. A proper diagnosis of the input relay circuit is needed to resolve the error permanently.

Follow the same diagnostic steps used for error E0236. Begin by inspecting the input relay for physical damage and testing it for proper switching. Check all wiring and connectors between the relay and the power board for corrosion or looseness. If the relay and wiring are sound, the power board may need to be replaced.