Boiler runs but does not heat the house adequately, radiators lukewarm

Safety first: Do not adjust gas components without proper tools and training.

• Check thermostat and setpoint: Verify thermostats are set above room temperature and that the Utica boiler's supply temperature setpoint or reset curve is appropriate for the system.
• Bleed air from system: Air in radiators reduces heat transfer. Use air vents to purge air until water flows steadily.
• Inspect burner: With power and gas off, remove the burner and check for debris or corrosion. Clean gently and reassemble.
• Professional gas check: If the boiler still underheats, a technician should check gas input, combustion, and modulation settings per Utica specifications.