Radiators on upper floors cold while lower floors heat normally

Safety: System water may be hot; use a cloth when bleeding radiators.

• 1. Bleed upper radiators: Starting from the top floor, bleed each radiator until water flows without air.
• 2. Check system pressure: After bleeding, top up pressure to the recommended level.
• 3. Pump setting: Increase the pump speed or head setting on the Brötje pump if adjustable.
• 4. Clean dirt separator: If fitted, isolate and clean the dirt separator or filter on the return line.