Boiler runs but radiators remain cold or only lukewarm.

Safety: Allow system to cool slightly before bleeding radiators.

Steps:

• Check boiler temperature: Ensure the Attack boiler is reaching its set flow temperature on the display.
• Bleed radiators: Starting from the top floor, bleed each radiator until water flows steadily.
• Verify valves: Make sure all radiator valves and any motorized zone valves are open and operating.
• Check pump: Confirm the pump is running and set to an adequate speed.

Technician: If circulation remains poor, a power flush or pump replacement may be required.