Ariston Cooktop Error Code E.25

E.25 means the cooktop has detected an open circuit in the dissipator temperature sensor for the supplying generator. This sensor monitors the heat sink that protects the cooktop's internal power electronics. Because the control board cannot read a valid temperature signal, the cooktop shuts down to prevent potential damage to the generator components.

No. E.25 indicates the cooktop cannot monitor the temperature of its internal power electronics. Continuing to operate the unit in this condition risks overheating the generator module, which could cause further component damage or create a safety hazard. The cooktop should remain unplugged until the fault is diagnosed and repaired.

Repair costs vary depending on the root cause. Replacing a dissipator temperature sensor typically falls in the range of $20 to $80 for the part, plus labor if a technician is used. If the main control board requires replacement, costs can range from $100 to $300 or more for parts alone. A diagnostic service call generally adds $50 to $120 depending on your location.

Some causes, such as a loose connector, can be addressed by a knowledgeable DIYer after fully unplugging the unit. However, the fault is located in the high-voltage power electronics section of the cooktop, so internal inspection carries risk if you are not experienced with appliance repair. Replacing the sensor or control board typically requires basic tools and component sourcing, but if you are unsure, a qualified technician is the safer option.

A power reset by unplugging the unit for a few minutes may temporarily clear the error if the fault was caused by a transient glitch. However, if the underlying cause is a physically broken sensor, a broken wire, or a failed connector, the error will return as soon as the cooktop attempts to read the sensor again. A reset alone does not fix the fault.