Gurgling or rushing water sounds in radiators or inside the Nibe unit.

Safety: Allow the system to cool before bleeding. Protect floors from water spills.

• Bleed high points: Use bleed valves on radiators, manifolds, and any automatic air vents near the Nibe unit to release trapped air.
• Top up pressure: After bleeding, restore system pressure to the recommended level using the filling loop.
• Check for leaks: Inspect joints and valves for small leaks that can introduce air.
• Verify auto vents: Ensure automatic air vents are open and not capped off.