mypros+
Error code reference

Ariston Cooktop Error Code E.23

Keyboard temperature sensor in open circuit (CO).

Ariston codesAriston cooktop codes

Keyboard temperature sensor in open circuit (CO).

MyPros+ Max

Get the full diagnostic procedure for E.23.

  • 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
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What E.23 means on a Ariston cooktop

Error code E.23 on an Ariston cooktop indicates that the keyboard temperature sensor has been detected in an open circuit condition. This sensor monitors the temperature of the control panel or touch keypad area, protecting the electronics from overheating during cooking operation. An open circuit means the electrical path through the sensor has been interrupted completely, producing no readable signal to the control board.

The keyboard temperature sensor is typically a negative temperature coefficient (NTC) thermistor integrated into or positioned near the touch control panel assembly. Under normal operation, the thermistor varies its resistance in a predictable way as temperature changes, allowing the control board to monitor keypad surface temperatures. When the circuit is open, the control board reads no resistance at all, which triggers the E.23 fault and typically disables cooktop operation as a protective measure.

Common causes of this open circuit condition include a broken or disconnected sensor wire harness, a failed thermistor with an internal break, corrosion at the connector terminals, or physical damage to the sensor itself from moisture or heat exposure. The wiring between the sensor and control board is particularly vulnerable at connector junction points, where repeated thermal cycling can cause pins to loosen or connections to oxidize over time.

Source: manufacturer service documentation.

Common causes of E.23

  1. 01

    Disconnected or loose sensor wiring harness

    Wiring / connection

    The wire connector linking the keyboard temperature sensor to the control board may have come loose or detached, breaking the circuit. Inspect all connectors near the keypad assembly for secure seating and signs of loosening.

  2. 02

    Failed keyboard temperature sensor (thermistor)

    Part replacement

    The thermistor itself may have developed an internal open circuit failure, meaning it no longer conducts electricity. This can be confirmed by measuring resistance across the sensor terminals; an open circuit reading confirms the sensor has failed.

  3. 03

    Corroded or oxidized connector terminals

    Wiring / connection

    Moisture or heat exposure over time can cause the connector pins at the sensor or control board end to corrode, increasing resistance to the point of effectively breaking the circuit. Inspect terminals for discoloration, pitting, or white residue.

  4. 04

    Damaged sensor wiring

    Part replacement

    The wire leading from the keyboard temperature sensor to the control board may be pinched, cut, or broken along its routing path. Carefully trace the harness for any visible damage, kinks, or burn marks.

  5. 05

    Faulty control board

    Part replacement

    If the sensor and all associated wiring check out as intact and properly connected, the control board itself may have a failed input circuit for the keyboard sensor signal. This is a less common cause and should be diagnosed after ruling out sensor and wiring issues.

See the test procedure for each cause

Frequently asked questions about E.23

What does E.23 mean on a Ariston cooktop?
E.23 indicates that the keyboard temperature sensor has been detected in an open circuit condition. This sensor monitors the temperature of the touch control panel area and protects the electronics from overheating. When the control board receives no signal from this sensor, it triggers E.23 and may disable the cooktop to prevent potential damage.
Can I fix the E.23 error myself on my Ariston cooktop?
A knowledgeable DIYer can inspect the wiring harness and connectors for obvious disconnections or corrosion, and may be able to reseat loose connectors without replacing any parts. However, testing the thermistor with a multimeter and replacing internal components requires disassembling the cooktop, which carries electrical safety risks. If you are not comfortable working with appliance electronics, a qualified technician is recommended.
Is it safe to use my Ariston cooktop while it shows E.23?
It is not advisable to continue using the cooktop while E.23 is active. The keyboard temperature sensor is a safety component that protects the control panel electronics from overheating. Without a functioning sensor, the cooktop cannot monitor or respond to rising temperatures at the keypad, which could lead to component damage or create a hazardous condition.
Will resetting the cooktop clear the E.23 error?
A power reset, such as switching off the cooktop at the circuit breaker for several minutes and restoring power, may temporarily clear the error display. However, if the underlying cause is a failed sensor, broken wire, or faulty connector, the E.23 code will return once the control board attempts to read the sensor again. A reset does not repair the open circuit condition.
How much does it cost to repair an E.23 error on an Ariston cooktop?
Repair costs vary depending on the root cause. If only a connector needs to be reseated, there may be no parts cost, though a technician's diagnostic fee typically ranges from $50 to $100. Replacing the keyboard temperature sensor itself generally costs between $20 and $80 for the part, plus labor. If the control board requires replacement, total costs including parts and labor can range from $150 to $400 or more depending on the model.

Related Ariston cooktop codes

All Ariston cooktop codes
View all 27 Ariston cooktop codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass