Furnace runs but house is not heating adequately; radiators or underfloor loops are lukewarm.

Safety: Allow system to cool slightly before bleeding radiators. Use caution with hot water.

• Check controller settings: On the Kospel control panel, verify the flow temperature setpoint or heating curve is appropriate for the building. Increase slightly if necessary.
• Bleed system: Bleed air from radiators and high points. Refill to correct pressure afterward.
• Adjust pump speed: If the circulation pump has selectable speeds, increase to a higher setting to improve flow.
• Inspect filters and strainers: Clean any system strainers or dirt separators that may be restricting flow.

If performance remains poor, a technician should check for internal blockage in the Kospel heat exchanger or system design issues.