Ariston Cooktop Error Code E.22

Error code E.22 on an Ariston cooktop indicates that the keyboard temperature sensor has been detected in a short circuit condition. This sensor, sometimes called the control panel NTC or keypad thermistor, is designed to monitor the temperature of the touch control board or keypad area. Its primary function is to prevent the control electronics from overheating during normal operation. When the cooktop's control system reads an abnormally low resistance value from this sensor, consistent with a short circuit, it triggers E.22 and typically disables operation to protect the unit.

A short circuit in a thermistor-type temperature sensor generally means the resistance across the sensor terminals has dropped to near zero ohms, which the control board interprets as an impossibly high temperature reading or a direct fault condition. This can result from physical damage to the sensor itself, a pinched or shorted sensor wiring harness, moisture or contamination bridging the sensor terminals, or a failed sensor component internally. The location of this sensor beneath or adjacent to the touch keypad makes it susceptible to heat exposure from cooking spills that seep under the glass surface.

Because this fault involves the keyboard temperature monitoring circuit, the control board continuously checks for valid resistance readings within an expected range. Any sustained short circuit condition will keep the error active regardless of power cycling, until the underlying fault in the sensor or its wiring is physically resolved. Diagnosis should focus on measuring the resistance of the keyboard temperature sensor directly and inspecting the wiring harness between the sensor and the control board for damage or contamination.