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Error code reference

Hotpoint Cooktop Error Code F14

ISI UART 1 (CN 03)

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ISI UART 1 (CN 03): Excessively high temperature on the large induction coil.

First step from the service manual

Check whether the induction coil NTC has become miscalibrated.

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

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What F14 means on a Hotpoint cooktop

The F14 error code on a Hotpoint induction cooktop indicates that the ISI UART 1 communication channel (connector CN 03) has detected an excessively high temperature reading on the large induction coil. The NTC (Negative Temperature Coefficient) thermistor assigned to monitor the large coil is the primary sensor responsible for this reading. NTC thermistors change resistance in response to temperature, and the control board interprets this resistance to determine coil temperature. When the board receives a signal indicating the coil has exceeded its safe operating threshold, it triggers F14 and typically shuts down the affected cooking zone to prevent damage.

The first diagnostic priority is to assess whether the NTC thermistor has become miscalibrated. Over time or after thermal stress events, an NTC sensor can drift from its original calibration curve, causing it to report temperatures that do not accurately reflect actual coil conditions. This means the coil could be operating within normal parameters while the sensor sends a resistance value that the board interprets as an overtemperature condition. Miscalibration can occur gradually or following an abrupt thermal event such as a boilover or prolonged high-power cooking session.

Beyond calibration drift, the fault can also stem from genuine overheating caused by blocked ventilation, a failed cooling fan, or a damaged coil assembly. Inspecting the NTC resistance value at a known ambient temperature and comparing it to the expected specification for the thermistor type is the most direct way to distinguish a sensor fault from an actual thermal event. Wiring between the NTC and CN 03 should also be checked for continuity and secure seating at the connector.

Source: manufacturer service documentation.

Common causes of F14

  1. 01

    Miscalibrated NTC thermistor

    Part replacement

    The NTC thermistor monitoring the large induction coil can drift out of calibration, causing it to report a falsely high temperature to the control board even when the coil is within safe limits. Comparing the sensor's resistance at ambient temperature against the expected value will reveal whether it has drifted.

  2. 02

    Blocked or restricted ventilation

    Wiring / connection

    If the cooktop's ventilation openings are obstructed by debris or grease buildup, heat cannot escape efficiently and the large coil can genuinely overheat during use. Inspect all vents and the underside of the unit for blockage.

  3. 03

    Failed or slow cooling fan

    Part replacement

    Induction cooktops rely on internal fans to keep coil and electronics temperatures in check. A fan that has seized, slowed, or stopped will allow temperatures to climb rapidly, triggering F14 during or shortly after cooking.

  4. 04

    Faulty wiring at connector CN 03

    Wiring / connection

    Loose, corroded, or damaged wiring between the NTC thermistor and the CN 03 connector on the ISI UART 1 channel can produce erratic or out-of-range resistance signals that the board interprets as overtemperature. Check the connector for secure seating and inspect wiring for visible damage.

  5. 05

    Damaged or failed induction coil

    Part replacement

    Physical damage to the large induction coil itself can cause localized hot spots that push actual temperatures beyond the acceptable threshold. If the NTC and wiring check out correctly, the coil assembly should be inspected for damage.

See the test procedure for each cause

Frequently asked questions about F14

What does F14 mean on a Hotpoint cooktop?
F14 indicates that the ISI UART 1 channel (connector CN 03) has detected an excessively high temperature on the large induction coil. The control board monitors coil temperature through a dedicated NTC thermistor, and when the reading exceeds the safe threshold, it triggers F14 and disables the affected zone. The fault can reflect a genuine overtemperature condition or a miscalibrated sensor reporting a false high reading.
Can I fix the F14 error myself?
Some basic checks are within reach for a confident DIYer, such as clearing ventilation blockages and inspecting the CN 03 connector for loose wiring. However, testing NTC thermistor calibration requires a multimeter and knowledge of the expected resistance values, and replacing internal components involves working near high-voltage induction electronics. If you are not comfortable with appliance electrical work, a qualified technician is the safer choice.
Is it safe to keep using my cooktop when F14 appears?
No. The cooktop shuts down the large cooking zone specifically to prevent coil damage or a more serious thermal event. Continuing to attempt to use the affected zone while the fault is active is not recommended. The underlying cause, whether a faulty sensor or actual overheating, should be diagnosed and resolved before resuming normal use.
Will resetting the cooktop clear the F14 error?
A power reset by switching off the cooktop at the circuit breaker for several minutes may temporarily clear the fault display. However, if the NTC thermistor is miscalibrated, the cooling fan is failing, or ventilation is blocked, the error will return during the next cooking session. A reset addresses the symptom but not the underlying cause, so proper diagnosis is still required.
How much does it cost to repair an F14 error on a Hotpoint induction cooktop?
Repair costs vary depending on the root cause. Cleaning blocked vents is essentially free, while replacing an NTC thermistor typically falls in a lower cost range for parts, though labor adds to the total. A cooling fan replacement or coil assembly repair will generally cost more, with parts and labor combined potentially ranging from moderate to significant depending on your region and the technician's rates. Getting a diagnostic assessment first helps narrow down the actual repair needed before committing to a cost.

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