Boiler displays H6; burner output limited or boiler shuts down

Safety: Allow the system to cool before touching pipework.

• 1. Open radiators: Ensure enough radiators or underfloor loops are open to dissipate boiler output.
• 2. Check pump settings: If the Buderus pump has adjustable speed, increase to a higher setting to improve circulation.
• 3. Clean filters: Clean any magnetic or mesh filters in the system return line.
• 4. Balance system: Have a technician balance the heating system to ensure proper flow through all circuits.