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Error code reference

Ariston Cooktop Error Code E.30

REL cooking zone temperature sensor in short circuit (CC).

Ariston codesAriston cooktop codes

REL cooking zone temperature sensor in short circuit (CC).

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What E.30 means on a Ariston cooktop

Error code E.30 on an Ariston cooktop indicates that the REL (relay-controlled) cooking zone temperature sensor has been detected in a short circuit condition. The temperature sensor in this context is a thermistor or similar resistive sensing element that monitors the cooking zone's heat level to protect the unit from overheating and to regulate power delivery. When the control board reads a short circuit across the sensor terminals, the resistance value drops to near zero ohms, which is outside the normal operating range for the sensor. This causes the electronics to flag the fault and disable the affected zone as a protective measure.

The most common root causes of this fault involve physical damage to the sensor itself, degraded wiring insulation, or contamination from spills and heat cycling that causes internal shorts within the sensor body or along its cable harness. Over time, repeated exposure to high temperatures can cause the insulation on the sensor leads to crack and allow conductors to contact each other or a grounded surface. In some cases, the short circuit is not in the sensor itself but at the connector where the sensor plugs into the control board, particularly if moisture or food debris has bridged the connector pins.

Diagnosing this fault requires isolating the sensor from the control board and measuring the sensor's resistance directly with a multimeter. A shorted sensor will read near 0 ohms rather than the expected resistance value for the given temperature. If the sensor reads correctly when disconnected, the fault may lie in the wiring harness or connector. The control board should only be considered a cause if both the sensor and all associated wiring check out within specification.

Source: manufacturer service documentation.

Common causes of E.30

  1. 01

    Failed cooking zone temperature sensor

    Part replacement

    The thermistor or temperature sensor itself has developed an internal short, causing its resistance to read near zero ohms. This is the most likely cause and can be confirmed by disconnecting the sensor and measuring its resistance with a multimeter.

  2. 02

    Damaged or shorted sensor wiring harness

    Part replacement

    Heat cycling and physical wear can crack the insulation on the sensor leads, allowing two conductors to contact each other or a grounded metal surface. Visually inspect the wiring from the sensor to the control board connector for any signs of melting, pinching, or bare wire.

  3. 03

    Contaminated or corroded sensor connector

    Wiring / connection

    Liquid spills or food residue can bridge the sensor connector pins at the control board, creating an artificial short circuit. Inspect the connector for moisture, corrosion, or debris and clean carefully if contamination is found.

  4. 04

    Faulty control board

    Part replacement

    In rare cases, the control board's sensor input circuit may have failed internally, causing it to misread a normal sensor as a short. This should only be suspected after the sensor and all wiring have been tested and confirmed good.

See the test procedure for each cause

Frequently asked questions about E.30

What does E.30 mean on a Ariston cooktop?
E.30 on an Ariston cooktop means the temperature sensor for the REL cooking zone has been detected in a short circuit condition. The control board is reading near-zero resistance from the sensor, which is outside the normal operating range. As a result, the affected cooking zone is disabled to protect the unit. The fault requires inspection and testing of the sensor and its associated wiring.
Can I fix the E.30 error myself?
A confident DIYer with a multimeter can perform basic diagnostics such as inspecting wiring and measuring sensor resistance. However, replacing the temperature sensor or control board involves disassembling the cooktop and working near electrical components, which carries risk if not done carefully. If you are not comfortable with appliance electrical work, it is best to call a qualified technician.
Is it safe to use my Ariston cooktop while the E.30 error is showing?
The affected cooking zone will typically be disabled when E.30 is active, making it non-functional. You should not attempt to bypass this safety lockout. If other zones are still operational, they may continue to work, but it is advisable to have the fault repaired promptly to avoid any risk of the issue spreading to the control board or other components.
Will resetting the cooktop clear the E.30 error?
A power reset may temporarily clear the error display, but if the temperature sensor or its wiring remains in a short circuit condition, the E.30 fault will return as soon as the cooktop runs its diagnostic checks. A reset alone does not resolve the underlying hardware fault and the sensor or wiring must be inspected and repaired.
How much does it cost to repair an E.30 error on an Ariston cooktop?
Repair costs vary depending on what has failed. A replacement cooking zone temperature sensor typically ranges from $20 to $80 for the part, while a control board replacement can run $100 to $250 or more. Adding professional labor, total repair costs generally fall between $100 and $350 depending on your location and the specific parts required.

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