Radiators upstairs get hot but downstairs remain cold

Safety: Allow system to cool before bleeding radiators. Use cloths to catch any water.

• Bleed downstairs radiators: Air can accumulate in lower radiators if system layout is unusual. Bleed each radiator until water flows steadily.
• Check TRVs: Ensure all downstairs TRVs are fully open and not stuck.
• Balance system: Slightly close lockshield valves on very hot upstairs radiators to encourage more flow downstairs.
• Engineer tasks:
  • Assess pump sizing and speed.
  • Powerflush the system if sludge is suspected.

Balancing can significantly improve heat distribution without major work.