E02 appears on the display and the machine stops heating or brewing.

Safety first: Unplug the coffee maker and let it cool for at least 30 minutes. The boiler and hot plate can remain hot.

• Power reset: Disconnect power for 5–10 minutes to clear any temporary error. Plug back in and attempt a rinse or brew cycle.
• Check for scale buildup: Heavy limescale on the Kenwood thermoblock or boiler can cause abnormal temperature readings. Run a full descaling cycle using a Kenwood-approved descaler according to the user manual.
• Inspect external wiring (if accessible): On some Kenwood filter and espresso models, you can remove the rear cover (after unplugging) to visually check the small two-wire harness going to the boiler sensor (NTC). Ensure the connector is firmly seated and wires are not burnt or broken. Do not touch other components if you are not comfortable working with appliances.
• Do not bypass sensors: Never short or bypass the temperature sensor or thermal fuse; this is a fire and burn hazard.
• If E02 remains: The NTC sensor or main control PCB is likely defective. Replacement typically requires disassembly of the boiler assembly and should be done by a qualified technician.