Radiators are only lukewarm and the house does not reach the set temperature, boiler cycles on and off frequently.

User checks:

• Increase the CH flow temperature on the boiler control panel within recommended limits.
• Ensure all radiator valves are open, especially on radiators far from the boiler.
• Bleed radiators to remove trapped air.

Technician checks:

• Check and adjust the pump speed and verify adequate flow through the system.
• Balance the radiators by adjusting lockshield valves to ensure even heating.
• Inspect for sludge and consider a power flush and installation of a magnetic filter.
• Verify that the boiler's maximum CH output is correctly set in the parameters for the property size.

Proper balancing and flow settings are essential for comfort and efficiency.