Hotpoint Cooktop Error Code F08

F08 indicates a fault with the NTC temperature sensor on the small induction hotplate, specifically on the ISI UART 2 circuit at connector CN 04. The fault has three subcodes: subcode 1 is an NTC short circuit, subcode 2 is an NTC open circuit, and subcode 3 means the small hotplate is not being detected at all. The cooktop disables the affected burner zone when this error is active to prevent unsafe operation.

The cooktop disables the affected small induction burner zone when F08 is active, so that specific zone will not operate. Other burner zones may still function depending on the cooktop model. It is not advisable to continue using the appliance without addressing the fault, as the underlying sensor failure means the overtemperature protection on that burner is compromised.

Repair costs vary depending on which component has failed. If the issue is simply a loose or dirty connector, there may be no parts cost at all, just a service call fee which typically ranges from $75 to $150. Replacing an NTC thermistor or inductor coil assembly can add $80 to $250 or more in parts, depending on availability. If the main control board is involved, total repair costs including labor can range from $200 to $450 or higher.

The first diagnostic step is something a confident DIYer can attempt: checking that the inductor's connector at CN 04 is fully seated and that the contacts are clean and free of corrosion. If reseating the connector does not clear the fault, further diagnosis involves testing the NTC thermistor resistance and inspecting the wiring harness, which requires disassembly and a multimeter. Replacing the inductor coil assembly or control board is a more advanced repair that many homeowners prefer to leave to a qualified technician.

A power reset by switching off the cooktop at the circuit breaker for a few minutes may temporarily clear the error if it was caused by a momentary communication glitch or a connector that reseated itself. However, if the NTC thermistor is genuinely shorted, open, or the hotplate is not properly connected, the F08 code will return once power is restored and the control board runs its diagnostics. A reset is not a repair.