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Error code reference

Ariston Cooktop Error Code E.77

Communication interference (Checksum) Communicating Generator to Keyboard (secondary).

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Communication interference (Checksum) Communicating Generator to Keyboard (secondary).

First step from the service manual

Turn off for 5 minutes and turn on again.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E.77 means on a Ariston cooktop

Error code E.77 on an Ariston cooktop indicates a communication interference fault, specifically a checksum error occurring in the data transmission between the power generator board and the secondary keyboard (control panel). A checksum is a calculated value used to verify the integrity of data packets sent between two electronic components. When the checksum sent by the generator does not match the checksum expected by the keyboard, the system detects data corruption and triggers this fault code to prevent unpredictable cooktop behavior.

The communication pathway involved is a serial data link between the main generator board, which controls power output to the induction or gas ignition circuits, and the secondary user interface board that handles touch or button input. Interference on this communication line can corrupt data packets mid-transmission, causing repeated checksum mismatches. Sources of interference include electrical noise from nearby components, loose or damaged ribbon cable connections, or failing circuitry on either the generator board or the keyboard module itself.

Because E.77 is classified as a communication interference fault rather than a hardware failure fault, it can sometimes be transient. A voltage spike, a momentary ground issue, or a temporary electromagnetic disturbance can all produce this error without indicating permanent component damage. This is why the first recommended diagnostic step is a full power cycle of at least five minutes, which allows capacitors to discharge and communication buses to reset completely before the system reinitializes.

Source: manufacturer service documentation.

Common causes of E.77

  1. 01

    Transient electrical interference or power surge

    Wiring / connection

    A brief voltage spike or electromagnetic disturbance can corrupt the communication signal between the generator and keyboard boards, triggering a checksum mismatch without causing permanent damage. A five-minute power cycle is the first step to confirm if the fault is transient.

  2. 02

    Loose or damaged communication cable

    Wiring / connection

    The ribbon cable or wire harness connecting the generator board to the secondary keyboard can become unseated, pinched, or damaged over time. Inspect the connector at both ends for corrosion, bent pins, or incomplete seating.

  3. 03

    Faulty secondary keyboard board

    Part replacement

    If the keyboard module's communication circuitry is failing, it may not correctly interpret or validate the checksum data it receives from the generator. This is indicated when the error persists after confirming all cable connections are secure.

  4. 04

    Failing generator control board

    Part replacement

    The main generator board may be transmitting corrupted data packets due to degraded components on its communication circuit. This becomes the likely cause when the keyboard board and all cabling have been confirmed to be in good condition.

  5. 05

    Moisture or contamination on connectors

    Wiring / connection

    Spills or steam exposure can leave residue on the communication connectors between the two boards, increasing resistance and corrupting the signal. Inspect connectors for discoloration, corrosion, or residue buildup.

See the test procedure for each cause

Frequently asked questions about E.77

What does E.77 mean on a Ariston cooktop?
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.
Will turning the cooktop off clear the E.77 error?
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.
Is it safe to use my Ariston cooktop while E.77 is displayed?
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.
How much does it cost to repair an E.77 error on an Ariston cooktop?
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.
What should I check if the E.77 error keeps coming back after resetting?
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.

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