Boiler lockout occurs only during very cold or very windy weather

Safety first: Do not modify vent terminations without following manufacturer guidelines. Exhaust gases are hazardous.

• 1. Inspect vent and intake in cold weather: Look for ice buildup around terminations. Clear snow and ice and ensure proper clearances.
• 2. Wind effects: If vents terminate on a windy side of the building, wind can cause pressure fluctuations. A professional may need to add wind guards or relocate terminations.
• 3. Gas supply under load: If lockouts coincide with other gas appliances running, gas pressure may be dropping. Contact the gas utility and a technician to evaluate.
• 4. Combustion air: Ensure combustion air openings or intake piping are not blocked by snow or debris.