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Error code reference

Ariston Cooktop Error Code E.73

Communication delay with Communicating Generator.

Ariston codesAriston cooktop codes

Communication delay with Communicating Generator.

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.73 means on a Ariston cooktop

Error code E.73 on an Ariston cooktop indicates a communication delay between the cooktop's main control board and the Communicating Generator. The Communicating Generator is a component responsible for producing and transmitting the high-frequency signals used to drive induction cooking zones. When the control board cannot establish or maintain timely data exchange with this generator, the E.73 fault is triggered to prevent uncontrolled or undefined cooking behavior.

The communication pathway between the control board and the Communicating Generator relies on a dedicated internal data bus or signal line. Delays in this communication can result from loose or corroded wiring harness connections, a fault within the generator module itself, or a transient software or firmware issue in the control electronics. Power fluctuations or voltage irregularities from the supply line can also disrupt the timing of this communication link, causing the error to appear intermittently or persistently.

Because this error can sometimes be triggered by a temporary electronic glitch, the first recommended diagnostic step is a hard reset: power off the cooktop completely for at least 5 minutes, then restore power. This allows capacitors to discharge and control firmware to reinitialize. If the error returns after the reset, a deeper inspection of the wiring harness connections between the control board and the generator, as well as the generator module itself, is warranted.

Source: manufacturer service documentation.

Common causes of E.73

  1. 01

    Transient electronic glitch

    Wiring / connection

    A temporary software or firmware disruption can cause the control board to lose sync with the Communicating Generator. A 5-minute power-off reset often clears this without any parts replacement.

  2. 02

    Loose or corroded wiring harness connection

    Wiring / connection

    The signal or data cable connecting the main control board to the Communicating Generator may have a loose, corroded, or damaged connector. Inspect all harness connections between these two components for secure seating and visible corrosion.

  3. 03

    Supply voltage fluctuation

    Wiring / connection

    An unstable or out-of-range supply voltage can disrupt the timing of the internal communication bus, triggering the E.73 fault. Check the supply line voltage at the cooktop terminal block for stability and correct voltage level.

  4. 04

    Faulty Communicating Generator module

    Part replacement

    If the generator module itself has an internal failure, it will be unable to respond to the control board within the required communication window. This will cause a persistent E.73 error that does not clear after a reset.

  5. 05

    Failed main control board

    Part replacement

    A defective control board may be unable to properly initiate or maintain the communication protocol with the generator. This is typically identified after ruling out wiring and generator faults.

See the test procedure for each cause

Frequently asked questions about E.73

What does E.73 mean on a Ariston cooktop?
E.73 indicates a communication delay between the cooktop's main control board and its Communicating Generator, the component responsible for driving the induction cooking zones. The cooktop detected that data exchange between these two parts did not occur within the expected timeframe. This causes the unit to halt operation as a safety precaution. The fault can stem from a temporary glitch, a wiring issue, or a component failure.
Will resetting the cooktop clear the E.73 error?
A reset is the first recommended step and will clear E.73 if the cause was a temporary electronic or firmware glitch. Turn the cooktop completely off at the power source for at least 5 minutes, then restore power. If the error reappears immediately or after a short period of use, a hardware fault such as a wiring issue or failed component is likely and further diagnosis is needed.
Is it safe to use my Ariston cooktop while E.73 is displayed?
No, you should not attempt to operate the cooktop while E.73 is active. The error indicates the control board cannot reliably communicate with the generator that controls the cooking zones, which could result in unpredictable behavior. The cooktop will typically disable the cooking zones automatically when this error is present. Attempt a reset and only resume use if the error does not return.
How much does it cost to repair an E.73 error on an Ariston cooktop?
If the issue is resolved by a simple reset, there is no cost involved. If a technician visit is required, diagnostic service fees generally range from $75 to $150 depending on your region. Replacing a Communicating Generator module or a main control board can add parts and labor costs ranging from $150 to $400 or more, depending on part availability and local labor rates.
Can I diagnose E.73 myself or do I need a technician?
A homeowner can safely perform the initial reset by turning off the cooktop for 5 minutes and restoring power. If the error clears and does not return, no further action is needed. However, inspecting internal wiring harnesses, testing supply voltage at the terminal block, or replacing the Communicating Generator or control board requires disassembly of the unit and carries electrical risk. Those steps should be handled by a qualified appliance repair technician.

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