Furnace runs but radiators stay lukewarm, home does not reach set temperature

Safety first: Turn off power and gas before opening panels. Hot water and surfaces can cause burns.

• Check thermostat and settings: Confirm the room thermostat is set high enough and that the boiler flow temperature is not set too low on the control panel.
• Bleed radiators: Release trapped air from radiators starting with upper floors. Top up system pressure afterward.
• Check pump speed: Many Roca pumps have selectable speeds or modes. Set to a higher speed if the system is large.
• Inspect return temperature: If the return pipe is nearly as hot as the flow near the boiler but radiators are cool, there may be bypass valves or balancing issues that need adjustment.
• Professional service: Have a technician check gas rate, clean the primary heat exchanger, and flush the system if sludge is suspected.

Warning: Gas adjustments and chemical flushing should only be done by qualified personnel.