Ariston Cooktop Error Code E.31

E.31 on an Ariston cooktop means the temperature sensor for the REL cooking zone has been detected in an open circuit condition. The control board is receiving no signal from that sensor, so it cannot monitor the temperature of the zone. As a safety measure, the cooktop disables that cooking zone until the fault is resolved. The sensor itself, its wiring, or the connector are the most likely points of failure.

The cooktop disables the affected cooking zone when E.31 is active, so that specific zone should not operate and cannot overheat uncontrolled. Other zones may still function depending on the cooktop model. However, continued use of any appliance with an active fault code is not recommended, and the issue should be diagnosed and repaired before relying on the unit for regular cooking.

Repair costs depend on the root cause. If the fix is simply reseating a loose connector, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing a failed temperature sensor generally adds $30 to $100 in parts. If the main control board needs replacement, total repair costs can range from $200 to $400 or more depending on parts availability and labor rates in your area.

A knowledgeable DIYer can begin by inspecting the wiring harness and connectors for visible damage or loose connections, as these are simple to check and sometimes easy to reseat. However, replacing the temperature sensor or diagnosing a control board fault requires disassembling the cooktop and working near high-voltage components, which carries real safety risks. If you are not comfortable with appliance electronics, a qualified technician is the safer option.

A power reset by disconnecting the cooktop from mains power for a few minutes may temporarily clear the error display, but E.31 will return as soon as the control board re-checks the sensor circuit and detects the open circuit again. The underlying fault in the sensor, wiring, or connector must be physically repaired before the error will clear permanently.