Radiators are not heating properly even though boiler runs

Safety: Radiators can be hot; use gloves when adjusting valves.

Steps:

• Ensure all TRVs and lockshield valves are open, then gradually balance by slightly closing the hottest radiators.
• Bleed radiators to remove air.
• Increase the pump speed on the IVT boiler if adjustable.
• If some radiators remain cold, a technician should power-flush the system and clean filters.