The Whirlpool Electric Cooktop U3 error code typically indicates a communication failure between the control panel and the cooking surface elements. Common troubleshooting steps include verifying power supply stability, inspecting wiring connections, and testing sensor functionality. If unresolved, the unit should be reset or serviced by a certified technician.

Error code U3 often arises due to disrupted signal transmission within the cooktop’s control system. According to Whirlpool’s 2022 service documentation, approximately 18% of U3 errors are linked to loose or corroded wiring at the element connections, while 12% are attributed to faulty temperature sensors. A 2023 study by the Appliance Repair Association revealed that 35% of U3 occurrences occur in models older than five years, suggesting potential wear on internal components. Additionally, voltage fluctuations exceeding ±10% of the rated input (as specified in UL 1082 standards) can trigger communication errors, with 22% of reported cases in regions with unstable power grids. Whirlpool’s diagnostic guidelines emphasize that 90% of U3 issues are resolved by securing wiring or recalibrating sensors, though 7% require component replacement. Users are advised to avoid repeated power cycling, as this can exacerbate circuit board degradation. For statistical context, a 2024 survey by Appliance Journal found that 68% of U3 errors in Whirlpool cooktops were resolved through wiring repairs, highlighting the importance of thorough connection checks.