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Error code reference

Hotpoint Cooktop Error Code F07

ISI UART 2 (CN 04) inductor NTC fault on large induction hotplate

Hotpoint codesHotpoint cooktop codes

ISI UART 2 (CN 04) inductor NTC fault on large induction hotplate — subcode 1: NTC short circuit; subcode 2: NTC open circuit; subcode 3: large 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 F07 means on a Hotpoint cooktop

The F07 error code on a Hotpoint induction cooktop indicates a fault detected by the ISI UART 2 communication board at connector CN 04, specifically involving the NTC (Negative Temperature Coefficient) thermistor associated with the large induction hotplate's inductor. The NTC thermistor is a temperature-sensing resistor embedded near or on the inductor coil that continuously monitors operating temperature to protect the induction system from overheating. When the cooktop's control board reads a signal from this sensor that falls outside expected parameters, it flags F07 and disables the affected zone as a safety precaution.

The error is further defined by three subcodes. Subcode 1 indicates the NTC thermistor has shorted internally, causing resistance to drop near zero and sending the control board an artificially low temperature reading. Subcode 2 indicates the NTC circuit is open, meaning resistance has gone extremely high or the circuit is broken entirely, which the board interprets as a runaway temperature signal. Subcode 3 indicates the large induction hotplate is not detected as connected at all, pointing to a wiring or connector issue rather than a sensor failure itself.

The first diagnostic step is to inspect the inductor and its associated wiring harness, confirming that all contacts at connector CN 04 are fully seated, free of corrosion, and undamaged. Loose or oxidized connections can mimic both open-circuit and disconnection faults. If connections are confirmed secure and clean, the NTC thermistor itself should be tested for proper resistance values, and the inductor coil assembly should be checked for continuity and correct installation.

Source: manufacturer service documentation.

Common causes of F07

  1. 01

    Loose or dirty connector at CN 04

    Wiring / connection

    The wiring connector at CN 04 can work loose over time or develop oxidation on the contacts, causing intermittent or complete loss of signal from the NTC sensor. Inspect and reseat the connector, cleaning contacts if corrosion is present.

  2. 02

    Failed NTC thermistor (open circuit)

    Part replacement

    The NTC thermistor on the large inductor coil can fail open, sending an out-of-range resistance reading to the control board and triggering subcode 2. The sensor must be tested for correct resistance and replaced if it reads excessively high or shows no continuity.

  3. 03

    Shorted NTC thermistor

    Part replacement

    A shorted NTC thermistor, indicated by subcode 1, causes resistance to collapse near zero, making the board read an impossibly low temperature. This internal sensor failure requires replacement of the thermistor or the inductor assembly it is attached to.

  4. 04

    Large induction hotplate not connected

    Wiring / connection

    Subcode 3 points to the large induction hotplate being physically disconnected from the control board, which can happen after prior servicing or due to a broken wire harness. Verify the inductor coil assembly is correctly wired and all plugs are fully engaged.

  5. 05

    Damaged wiring harness to inductor

    Part replacement

    A pinched, burned, or broken wire in the harness running between the inductor coil and the ISI UART 2 board can produce open-circuit or disconnection faults identical to sensor failure. Inspect the full length of the harness for visible damage.

See the test procedure for each cause

Frequently asked questions about F07

What does F07 mean on a Hotpoint cooktop?
F07 indicates a fault with the NTC temperature sensor on the large induction hotplate, detected through the ISI UART 2 board at connector CN 04. The code has three subcodes: a shorted NTC sensor, an open-circuit NTC sensor, or the large hotplate not being detected as connected. The cooktop disables the affected zone until the fault is resolved.
Can I fix the F07 error myself, or do I need a technician?
Some causes of F07 are accessible to a confident DIYer, particularly checking that the connector at CN 04 is properly seated and that contacts are clean. However, testing the NTC thermistor for correct resistance values and replacing internal components requires disassembling the cooktop, which carries electrical risk. If you are not comfortable working inside appliances, a qualified technician is the safer choice.
Is it safe to keep using my cooktop while the F07 error is showing?
You should not continue using the large induction zone while F07 is active. The error indicates the cooktop cannot reliably monitor the temperature of that burner, which means overheating protection for that zone is compromised. Other zones may still function normally, but the faulted zone should remain unused until the fault is diagnosed and repaired.
Will resetting the cooktop clear the F07 error?
Resetting the cooktop by switching it off at the breaker and restoring power may temporarily clear the display, but the error will return if the underlying fault is still present. A reset does not repair a failed NTC thermistor, a loose connector, or a disconnected inductor. Proper diagnosis of the root cause is needed for a lasting fix.
How much does it cost to repair an F07 error on a Hotpoint induction cooktop?
Repair costs vary depending on the fault. If only the connector needs cleaning and reseating, the cost is minimal and may just involve a service call fee, typically in the range of $75 to $150. If the NTC thermistor or inductor coil assembly requires replacement, parts and labor combined can range from $150 to $400 or more depending on part availability and your location.

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