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Error code reference

Hotpoint Cooktop Error Code F06

ISI UART 1 (CN 03) inductor NTC fault on small induction hotplate

Hotpoint codesHotpoint cooktop codes

ISI UART 1 (CN 03) inductor NTC fault on small induction hotplate — subcode 1: NTC short circuit; subcode 2: NTC open circuit; subcode 3: small induction hotplate not connected.

First step from the service manual

Check the inductor, verifying that the contacts are well connected and clean.

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

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What F06 means on a Hotpoint cooktop

The F06 error code on a Hotpoint induction cooktop indicates a fault with the NTC (Negative Temperature Coefficient) thermistor located on the inductor assembly connected at connector CN 03, which is part of the ISI UART 1 circuit controlling the small induction hotplate. The NTC thermistor is a temperature-sensing component that monitors the inductor coil temperature during operation. The cooktop's control board uses resistance readings from this sensor to regulate power output and prevent overheating. When the sensor reading falls outside acceptable parameters, the board flags F06 and disables the affected zone.

The subcode distinguishes between three specific fault conditions. Subcode 1 indicates the NTC is shorted, meaning the thermistor resistance has dropped abnormally low, which the board interprets as an extremely high temperature reading. Subcode 2 indicates an open circuit in the NTC, meaning no resistance signal is reaching the board at all, typically due to a broken thermistor element or a broken wire in the sensor circuit. Subcode 3 indicates the small induction hotplate is not detected as connected, which points to a wiring or connector issue between the inductor assembly and the control board rather than a thermistor failure itself.

The first diagnostic priority is a thorough inspection of the CN 03 connector and all associated wiring between the inductor assembly and the control board. Loose, corroded, or damaged contacts at this connector are a frequent root cause across all three subcodes. If the connector checks out, the NTC thermistor itself should be tested for correct resistance values and continuity, and the inductor coil assembly should be confirmed as properly seated and electrically connected.

Source: manufacturer service documentation.

Common causes of F06

  1. 01

    Loose or dirty connector at CN 03

    Wiring / connection

    A poor connection at the CN 03 connector between the inductor assembly and the control board can trigger all three subcodes. Inspect the connector for corrosion, debris, or unseated terminals and clean or reseat as needed.

  2. 02

    Failed NTC thermistor (open circuit)

    Part replacement

    The NTC thermistor can fail internally, resulting in an open circuit and triggering subcode 2. This causes the control board to receive no resistance signal from the sensor, and the thermistor will need to be replaced.

  3. 03

    Shorted NTC thermistor

    Part replacement

    A shorted thermistor, corresponding to subcode 1, causes the resistance to drop abnormally low and sends an erroneous overtemperature signal to the control board. Testing the thermistor with a multimeter will confirm a short if resistance reads near zero.

  4. 04

    Small induction hotplate not connected or disconnected

    Wiring / connection

    Subcode 3 specifically indicates the inductor coil assembly for the small hotplate is not detected. This can result from a disconnected wiring harness, a broken wire, or a coil assembly that has come loose from its mounting.

  5. 05

    Damaged wiring harness between inductor and control board

    Part replacement

    Physical damage, heat exposure, or pinched wires along the harness connecting the small inductor to the board can cause intermittent or permanent signal loss. Inspect the full wire run for visible damage, melting, or breaks.

See the test procedure for each cause

Frequently asked questions about F06

What does F06 mean on a Hotpoint cooktop?
F06 indicates a fault with the NTC temperature sensor on the small induction hotplate, connected through the ISI UART 1 circuit at connector CN 03. The code has three subcodes: a shorted NTC, an open-circuit NTC, or the small hotplate not being detected as connected. The cooktop disables the affected zone until the fault is corrected.
Can I fix the F06 error myself, or do I need a technician?
If the cause is simply a loose or dirty connector at CN 03, a careful DIYer comfortable working inside appliances can reseat and clean the connector after disconnecting power. However, diagnosing a failed NTC thermistor requires a multimeter and some familiarity with reading resistance values. Replacing the inductor assembly or control board is generally a job for a qualified technician.
Is it safe to keep using my cooktop with an F06 error?
The cooktop disables the affected small hotplate zone when F06 is active, so you cannot use that zone. Other zones may continue to function, but it is advisable to have the fault diagnosed and repaired promptly. Operating with an unresolved sensor fault means the cooktop cannot properly monitor temperature on that inductor.
Will resetting the cooktop clear the F06 error?
A power reset by disconnecting the cooktop from the mains for a few minutes may temporarily clear the error, but if the underlying fault remains, F06 will return once the unit is powered and the affected zone is used again. A permanent fix requires addressing the root cause, whether that is a connector, wiring, or faulty NTC thermistor.
How much does it typically cost to repair an F06 error on a Hotpoint cooktop?
Repair costs depend on the root cause. Cleaning or reseating a connector involves no parts cost and minimal labor. Replacing an NTC thermistor is generally a lower-cost repair, while replacing the full inductor assembly or the control board can range from moderately expensive to a significant portion of the appliance's value. Expect diagnostic fees of roughly $50 to $100 before parts and labor are added.

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