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Error code reference

Hotpoint Cooktop Error Code F10

ISI UART 1 (CN 03) heat-sink NTC fault

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ISI UART 1 (CN 03) heat-sink NTC fault — subcode 1: short circuit; subcode 2: open circuit.

First step from the service manual

Replace the corresponding generator board.

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

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What F10 means on a Hotpoint cooktop

The F10 error code on a Hotpoint cooktop indicates a fault with the heat-sink NTC (Negative Temperature Coefficient) thermistor associated with ISI UART 1, connected at the CN 03 port on the induction generator board. The NTC thermistor is a temperature-sensing resistor mounted directly on the heat sink of the induction generator. It continuously monitors the temperature of the power electronics to prevent overheating damage. When the control system detects a reading outside the expected resistance range, it triggers F10 and shuts down the affected induction zone to protect the unit.

The error is further specified by subcodes. Subcode 1 indicates a short circuit condition, meaning the NTC thermistor is reading abnormally low resistance, which the control board interprets as an extremely high temperature or a wiring fault. Subcode 2 indicates an open circuit condition, where the thermistor or its wiring has broken continuity, resulting in no signal being returned to the control board. Both conditions prevent the generator from operating safely and will disable the cooking zone associated with that generator channel.

Because the NTC thermistor is integrated into or directly associated with the induction generator board at the CN 03 connection, the primary corrective action is replacement of that generator board. Wiring between the thermistor and the control board should be inspected for damage, loose connections, or corrosion at the CN 03 connector before replacing the board, as a wiring fault can mimic a thermistor failure.

Source: manufacturer service documentation.

Common causes of F10

  1. 01

    Failed induction generator board (NTC integrated fault)

    Part replacement

    The heat-sink NTC thermistor on the induction generator board has failed internally, either shorting (subcode 1) or opening (subcode 2). Since the thermistor is part of or directly mounted to the generator board assembly, board replacement is the standard corrective action.

  2. 02

    Loose or disconnected CN 03 connector

    Wiring / connection

    The wiring harness connector at the CN 03 port may have come loose or partially disconnected, causing an open circuit reading that triggers subcode 2. Inspect the connector for proper seating and secure attachment before replacing the board.

  3. 03

    Damaged wiring between NTC and control board

    Wiring / connection

    The wiring between the heat-sink NTC and the CN 03 port may have sustained heat damage, pinching, or corrosion, producing either a short or open circuit signal. Visually inspect the harness for burn marks, frayed insulation, or corroded terminals.

  4. 04

    Heat-sink overheating event causing thermistor damage

    Part replacement

    A prior overheating event on the generator heat sink can permanently damage the NTC thermistor, pushing it into a failed short or open state. Signs of this include discoloration on the board or a burnt odor near the cooktop electronics.

  5. 05

    Moisture or contamination at the CN 03 connector

    Wiring / connection

    Liquid intrusion or debris at the CN 03 connector can alter the resistance reading seen by the control board, triggering a false fault. Clean and dry the connector carefully before performing further diagnostics.

See the test procedure for each cause

Frequently asked questions about F10

What does F10 mean on a Hotpoint cooktop?
F10 indicates a fault with the heat-sink NTC thermistor on the ISI UART 1 induction generator board, connected at the CN 03 port. Subcode 1 points to a short circuit in the thermistor circuit, while subcode 2 points to an open circuit. The cooktop disables the affected induction zone to prevent damage to the power electronics. Replacing the corresponding induction generator board is the recommended corrective action.
Can I fix the F10 error myself, or do I need a technician?
A knowledgeable DIYer can start by inspecting the CN 03 wiring connector for loose connections, damage, or contamination, as these checks require no special tools beyond basic safety precautions. However, replacing the induction generator board involves working with high-voltage electronics and requires proper discharge procedures and component handling skills. If you are not experienced with induction cooktop internals, a qualified technician should perform the board replacement.
Is it safe to keep using my Hotpoint cooktop when F10 is displayed?
The cooktop disables the affected induction zone when F10 is active, so that burner will not operate. Other zones may continue to function, but it is not advisable to use the cooktop for extended cooking sessions while a fault is active. The underlying fault involves a temperature protection circuit, so continued use without repair could risk undetected overheating of the generator electronics.
Will resetting the cooktop clear the F10 error code?
A power reset by switching off the circuit breaker for 30 to 60 seconds may temporarily clear the display, but the fault will return if the underlying cause is not corrected. Because F10 is tied to a hardware failure in the NTC thermistor circuit or its wiring, the error will reappear as soon as the cooktop attempts to operate that generator channel. A reset alone is not a repair.
How much does it cost to repair an F10 error on a Hotpoint cooktop?
Repair costs vary depending on the model and whether a technician is involved. An induction generator board replacement typically ranges from around $150 to $400 or more, including the part and labor. If the fault turns out to be a wiring or connector issue, the cost may be significantly lower. Getting a diagnostic service call before committing to parts replacement is advisable to confirm the root cause.

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