Ariston Cooktop Error Code E.55

E.55 indicates that the temperature sensor for the FRL (front-left) cooking zone has been detected in an open circuit condition. The control board is receiving no valid signal from that sensor, so it has disabled the affected cooking zone as a safety precaution. The fault points to a broken electrical path somewhere between the sensor element and the control board.

The FRL cooking zone affected by E.55 will be disabled and will not operate while the fault is active, so there is no immediate risk from that zone overheating without sensor feedback. However, the remaining zones may still function. It is best to resolve the fault before continued use to avoid any underlying wiring issues that could worsen over time.

Repair costs vary depending on what component has failed. A replacement NTC temperature sensor typically falls in the range of $15 to $60 for the part alone. If a technician is needed for diagnosis and installation, labor charges generally add $80 to $150 or more depending on your location. Control board replacement, if required, is the most expensive scenario and can range from $150 to $350 or higher for parts and labor combined.

Some causes of E.55, such as a loose connector, can be addressed by a confident DIYer who is comfortable working inside an appliance after disconnecting power. However, testing sensor resistance with a multimeter and tracing wiring faults inside the cooktop requires basic electrical knowledge and proper safety precautions. If the sensor or control board needs replacement, a qualified appliance technician is recommended to ensure correct parts and safe reassembly.

A power reset by disconnecting the cooktop from mains power for a few minutes may temporarily clear the displayed error, but E.55 will return as soon as the control board performs its sensor check at startup if the underlying fault is still present. The open circuit condition in the sensor wiring or sensor element must be physically repaired for the code to stay cleared.