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Error code reference

Ariston Cooktop Error Code E.35

FRR cooking zone temperature in open circuit (CO).

Ariston codesAriston cooktop codes

FRR cooking zone temperature in open circuit (CO).

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E.35 means on a Ariston cooktop

Error code E.35 on an Ariston cooktop indicates that the FRR cooking zone temperature sensor has been detected in an open circuit condition. The FRR zone refers to a specific induction or electric cooking zone on the cooktop that is monitored by a dedicated NTC (negative temperature coefficient) or thermocouple-type temperature sensor. An open circuit condition means the control board is receiving no signal from the sensor, rather than a signal that falls within the expected resistance or voltage range. This is distinct from a short circuit fault, where the sensor reads an abnormally low resistance. In an open circuit, the circuit is broken entirely, so no current flows through the sensor loop back to the control board.

The temperature sensor for the FRR zone is typically mounted beneath the glass ceramic surface or directly on the heating element assembly. Its function is to continuously report the zone temperature to the main control board, which uses this data to regulate power output and prevent overheating. When the board detects a break in this signal path, it flags E.35 and may disable that specific cooking zone as a safety measure to prevent uncontrolled heating.

Common causes of this open circuit fault include a physically broken sensor, a disconnected or corroded wiring harness connector between the sensor and the control board, or a failed sensor whose internal resistance has drifted to an out-of-range value. The wiring harness running from the sensor to the board can also develop breaks due to heat exposure over time. In some cases, the main control board itself may have a failed input circuit for that sensor channel.

Source: manufacturer service documentation.

Common causes of E.35

  1. 01

    Failed or broken temperature sensor

    Part replacement

    The NTC or thermocouple sensor for the FRR zone may have developed an internal break, causing it to present an open circuit to the control board. This is the most frequent root cause and the sensor will need to be replaced.

  2. 02

    Disconnected or loose wiring harness connector

    Wiring / connection

    The connector between the temperature sensor and the control board may have come loose due to vibration or heat cycling. Inspect the connector at both the sensor and board ends and reseat any loose connections.

  3. 03

    Damaged wiring between sensor and control board

    Part replacement

    The wire harness running from the FRR zone sensor to the main board is exposed to heat and can develop breaks or fraying over time. Visually inspect the full length of the harness for visible damage or conductivity breaks.

  4. 04

    Corroded connector terminals

    Wiring / connection

    Moisture or prolonged heat exposure can cause corrosion on the sensor connector pins, increasing resistance to the point that the board reads the circuit as open. Clean or replace affected terminals and connectors.

  5. 05

    Faulty main control board

    Part replacement

    If the sensor and all wiring check out correctly, the input channel on the main control board that reads the FRR zone sensor may have failed. This is the least common cause and is typically diagnosed only after confirming the sensor and wiring are intact.

See the test procedure for each cause

Frequently asked questions about E.35

What does E.35 mean on a Ariston cooktop?
E.35 means the control board has detected an open circuit condition on the temperature sensor for the FRR cooking zone. An open circuit means the sensor is not sending any signal back to the board, which could be due to a broken sensor, a disconnected wire, or damaged wiring. The cooktop will typically disable that zone until the fault is resolved.
Can I fix E.35 on my Ariston cooktop myself?
Some causes of E.35 can be addressed by a confident DIYer, such as reseating a loose harness connector. However, replacing the temperature sensor or control board requires disassembling the cooktop and working near electrical components, so a qualified appliance technician is recommended if you are not comfortable with that level of repair. Always disconnect power before inspecting internal components.
Is it safe to keep using my cooktop when E.35 is displayed?
No, you should not continue using the affected cooking zone while E.35 is active. The error indicates the control board cannot monitor the zone temperature, which means it cannot regulate power safely or prevent overheating. Other zones not affected by the fault may still function, but the FRR zone should remain unused until the fault is corrected.
Will resetting my Ariston cooktop clear the E.35 error?
A power reset by switching off the cooktop at the breaker for a few minutes may temporarily clear the error display, but it will not fix the underlying open circuit condition. If the sensor or wiring is physically broken or disconnected, the error will return as soon as the cooktop attempts to read the sensor again. A reset is useful for confirming whether the fault is persistent, but it is not a repair.
How much does it cost to repair an E.35 error on an Ariston cooktop?
Repair costs vary depending on what component has failed. A replacement temperature sensor typically runs in the range of $20 to $60 for the part, while a new main control board can cost $80 to $200 or more depending on the model. Adding labor from a qualified technician generally brings the total repair cost to somewhere between $100 and $350, depending on the diagnosis and local service rates.

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