Radiators or baseboards on upper floors are cold while lower floors heat

Safety: Bleeding air can release hot water. Use gloves and a container.

Steps:

• 1. Increase system pressure slightly: Temporarily raise cold pressure to 15–18 psi to help push air to vents (do not exceed 25–27 psi cold).
• 2. Bleed upper radiators: Starting at the top floor, open manual air bleeders until water flows steadily. Close tightly.
• 3. Check automatic air vents: Ensure caps on automatic vents near the boiler and high points are open (loose) to allow air to escape.

Professional service: If air problems recur, a technician should review system design, circulator sizing, and install proper air separators if needed.