Ariston Cooktop Error Code E.77

E.77 indicates a communication interference fault, specifically a checksum error, between the main generator board and the secondary keyboard control panel. The checksum is a data verification value used to confirm that signals sent between the two boards are accurate and uncorrupted. When mismatches are detected repeatedly, the cooktop displays E.77 and halts normal operation to prevent unsafe behavior.

It is not advisable to continue using the cooktop while E.77 is active. The fault indicates that communication between the power control board and the user interface is compromised, which could result in unpredictable behavior such as unintended power output changes. The cooktop should be power cycled first, and if the error persists, professional service is recommended before further use.

If E.77 returns after a five-minute power cycle, inspect the communication cable or ribbon connector running between the generator board and the keyboard panel for damage, corrosion, or loose seating. If the cabling appears intact, the fault likely points to a failing secondary keyboard board or the main generator board, either of which will require component-level testing or board replacement by a qualified technician.

Turning the cooktop off at the power supply for at least five minutes and then turning it back on is the first recommended step and can clear the error if it was caused by a transient electrical disturbance. If the error returns immediately or shortly after the reset, a deeper diagnostic of the communication cable and control boards is needed.

Repair costs depend on the root cause. If the fault is due to a loose cable, the repair may only involve a service call fee, typically in the range of $75 to $150. If a replacement keyboard board or generator control board is required, total repair costs including parts and labor can range from $200 to $500 or more depending on parts availability and local labor rates.