E13 is displayed and the milk frothing system does not operate correctly.

Safety first: Unplug the machine before disassembling the milk system. Hot milk and steam can cause burns.

• Clean milk accessories: Disassemble the Kenwood milk frother, including the suction tube, connector, and frothing head. Soak all removable parts in warm water with a little detergent, then rinse thoroughly.
• Check milk carafe seating: Ensure the milk carafe or external milk container is properly connected and pushed fully into its socket.
• Run cleaning program: Many Kenwood models have a milk system cleaning cycle. Run this with clean water to flush internal milk lines.
• Inspect for hardened milk: Use a fine brush or needle to clear any dried milk from small orifices in the frother head.
• If E13 remains: The milk system sensor or internal milk valve may be faulty and should be serviced professionally.