Boiler shows E10 and stops; may occur during operation or at startup, often with gurgling noises in the boiler.

Safety: Turn off power and allow the boiler to cool before bleeding or opening any components.

• Bleed the boiler and radiators: Use the automatic air vent (if fitted) or manual bleed points on the boiler and radiators to remove trapped air.
• Check pump speed setting: Some Atlantic pumps have adjustable speed. Ensure it is not set to the lowest setting if the system requires higher flow.
• Clean system filter: If a filter is installed on the return, isolate and clean it to restore flow.
• Professional service: A technician should test the flow switch or flow sensor, verify pump performance, and flush the primary heat exchanger if blocked.