Display shows E3 and brewing stops shortly after starting, or the unit beeps and shuts off.

Safety first: Unplug the coffee maker and allow it to cool for at least 30 minutes before working on it.

• Check water level: Ensure the water tank is filled above the minimum mark. Running the unit nearly empty can trigger overheat protection.
• Inspect tank outlet: Remove the tank and check the outlet valve at the bottom. Press it gently with a clean tool to confirm it opens and releases water. Rinse to remove debris.
• Descale the system:
  • Fill the tank with a 50/50 mix of white vinegar and water (or a Russell Hobbs-approved descaler).
  • Start a brew cycle without coffee grounds and let half the solution run through.
  • Switch off and let it sit for 20–30 minutes to dissolve scale in the aluminum heating tube.
  • Restart and complete the cycle, then run 2–3 full tanks of clean water to rinse.
• Check for kinks: If accessible, inspect the silicone hose from the pump to the heater for kinks or pinches.
• If E3 persists: The thermal fuse or thermostat may be weak, or the heater is partially blocked. Replacement of the aluminum heating element assembly or thermal cut-out is recommended via a service technician.